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February 2019 Weather in the Pacific Northwest - Part 1


Guest hawkstwelve

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What happened 12-14-08?

 

It was the only day EUG scored with the whole event.  North/central valley was buried after that though.

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Springfield, Oregon regular season 2023-24 Stats:

  • Coldest high: 25F (Jan 14, 2024)
  • Coldest low: 20F (Jan 14, 2024)
  • Days with below freezing temps: 24 (Most recent: Mar 8, 2024)
  • Days with sub-40F highs: 4 (Most recent: Jan 16, 2024)
  • Total snowfall: 0.0"
  • Total ice: 2.25”
  • Last accumulating snowfall on roads: Dec 27, 2021 (1.9")
  • Last sub-freezing high: Jan 15, 2024 (27F)
  • Last White Christmas: 1990
  • Significant wind events (gusts 45+): 0

Personal Stats:

  • Last accumulating snowfall on roads: Dec 27, 2021
  • Last sub-freezing high: Jan 16, 2024 (32F)
  • Last White Christmas: 2008
  • Total snowfall since joining TheWeatherForums: 42.0"
  • Sub-freezing highs since joining TheWeatherForums: 4

 

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GoFundMe "College Basketball vs Epilepsy": gf.me/u/zk3pj2

My Twitter @CBBjerseys4hope

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2-5-19 3:02 PM Model analysis, Snow storm thoughts

Here are some additional analysis and thoughts regarding the POTENTIAL for a Winter Storm (Poopers?) to impact WA/OR Friday evening and Saturday.

 

It is important to point out a few things and the major differences comparing the air mass ahead of the system Friday evening/Saturday to what we recently had Saturday night into this Tuesday morning. This is based on the 12z ECMWF, GEM, GFS NCEP, WRF, and to a bit lesser extent the FV3. The ICON was thrown out because Hasselhoff doesn't know what the Columbia Gorge is. It's also based on the current air mass, snow cover Gorge/east, and the coming east winds.

 

1) We already have the cold air in place. We didn't with this last Snow Dusting, Skiff-o-Matic Spectacular Event. We have cold, arctic air especially at lower levels in the Columbia Basin and it won't be going anywhere.

2) We have a snow covered Central/Eastern Gorge and Columbia Basin. It's not likely that will melt off ahead of the system Friday evening/Saturday. That will help the lower levels cool even further creating a 'refrigerator' effect if you will.

3) East winds should develop sometimes Wednesday. We didn't have that with this past cold shot. The widespread snow cover over the Columbia Basin will aid in developing high pressure, likely stronger than is modeled currently. Additionally with clearing skies the next 2 nights over there temps will plummet into the single digits and possibly below zero. This will develop a very strong and arctic cold pool. As east winds increase Wednesday night through Thursday that low level arctic air over the Columbia basin will be sucked westward through the Gorge chilling PDX metro further. A reinforcement shot of cold air. It will also thicken up the cold layer from 4000' to the surface, but ever so slightly less than in January due to higher sun angle in February.

4) As the system develops early Friday evening near Vancouver Island and drops south off the Washington coast early Saturday morning once it's about parallel with Ocean Shores/Long Beach that should begin to induce even more east winds keeping PDX very cold. It is possible immediate PDX metro is the only location that is sufficiently cold enough and areas south of Wilsonville are too warm as warmer air is pulled northward ahead of the low up the Willamette Valley. The exact track of the low is crucial for this. We want the low nearly hugging the Washington Coast as it drops south to minimize the warmer influence off the ocean and thus lessening any warm air advection. If it heads offshore further to our north than we won't see much of anything. *RIGHT NOW* no models show this, so relax. Okay.

5) Another key difference. This time the cold air source is from Northwest Territories, Alberta, Saskatchewan. The arctic trough digs towards us from the northeast with no warming influence from the Pacific ocean. The fact it's coming in sharply from the northeast and not rather down the BC Coast should drive arctic air rather easily into Eastern Washington and the Columbia Basin.

 

My thoughts: Based on all 12z runs I have growing consistency that PDX metro, Clark County in particular may see a Snow event/Storm late Friday night and Saturday. I'm currently at a 50-60% chance and leaving some wiggle room depending on how the upper level pattern is modeled the next 24-36 hours. If we didn't already have cold air in place going into this system and the snow cover in the Eastern Gorge, Columbia Basin I wouldn't be nearly as confident for snow. Any change in the upper level pattern Thursday through Friday to our north in the Northwest Territories, Alberta, and eastern British Columbia could "make or break" on whether or not we see snowfall. That will need to be watched carefully. The potential for a significant snow storm is there. Stay tuned!

 

I do think the potential is much higher Sunday-Monday, but you are absolutely the expert. I'm excited!

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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2-5-19 3:02 PM Model analysis, Snow storm thoughts

Here are some additional analysis and thoughts regarding the POTENTIAL for a Winter Storm (Poopers?) to impact WA/OR Friday evening and Saturday.

 

It is important to point out a few things and the major differences comparing the air mass ahead of the system Friday evening/Saturday to what we recently had Saturday night into this Tuesday morning. This is based on the 12z ECMWF, GEM, GFS NCEP, WRF, and to a bit lesser extent the FV3. The ICON was thrown out because Hasselhoff doesn't know what the Columbia Gorge is. It's also based on the current air mass, snow cover Gorge/east, and the coming east winds.

 

1) We already have the cold air in place. We didn't with this last Snow Dusting, Skiff-o-Matic Spectacular Event. We have cold, arctic air especially at lower levels in the Columbia Basin and it won't be going anywhere.

2) We have a snow covered Central/Eastern Gorge and Columbia Basin. It's not likely that will melt off ahead of the system Friday evening/Saturday. That will help the lower levels cool even further creating a 'refrigerator' effect if you will.

3) East winds should develop sometimes Wednesday. We didn't have that with this past cold shot. The widespread snow cover over the Columbia Basin will aid in developing high pressure, likely stronger than is modeled currently. Additionally with clearing skies the next 2 nights over there temps will plummet into the single digits and possibly below zero. This will develop a very strong and arctic cold pool. As east winds increase Wednesday night through Thursday that low level arctic air over the Columbia basin will be sucked westward through the Gorge chilling PDX metro further. A reinforcement shot of cold air. It will also thicken up the cold layer from 4000' to the surface, but ever so slightly less than in January due to higher sun angle in February.

4) As the system develops early Friday evening near Vancouver Island and drops south off the Washington coast early Saturday morning once it's about parallel with Ocean Shores/Long Beach that should begin to induce even more east winds keeping PDX very cold. It is possible immediate PDX metro is the only location that is sufficiently cold enough and areas south of Wilsonville are too warm as warmer air is pulled northward ahead of the low up the Willamette Valley. The exact track of the low is crucial for this. We want the low nearly hugging the Washington Coast as it drops south to minimize the warmer influence off the ocean and thus lessening any warm air advection. If it heads offshore further to our north than we won't see much of anything. *RIGHT NOW* no models show this, so relax. Okay.

5) Another key difference. This time the cold air source is from Northwest Territories, Alberta, Saskatchewan. The arctic trough digs towards us from the northeast with no warming influence from the Pacific ocean. The fact it's coming in sharply from the northeast and not rather down the BC Coast should drive arctic air rather easily into Eastern Washington and the Columbia Basin.

 

My thoughts: Based on all 12z runs I have growing consistency that PDX metro, Clark County in particular may see a Snow event/Storm late Friday night and Saturday. I'm currently at a 50-60% chance and leaving some wiggle room depending on how the upper level pattern is modeled the next 24-36 hours. If we didn't already have cold air in place going into this system and the snow cover in the Eastern Gorge, Columbia Basin I wouldn't be nearly as confident for snow. Any change in the upper level pattern Thursday through Friday to our north in the Northwest Territories, Alberta, and eastern British Columbia could "make or break" on whether or not we see snowfall. That will need to be watched carefully. The potential for a significant snow storm is there. Stay tuned!

Well said.

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What happened 12-14-08?

It snowed but it didn’t work out so well for Clark County. You would have done well but you were a fetus at the time and fetuses shouldn’t be out in the snow. KVUOsnowman had an epic meltdown. After a 2007-08 with so many near misses it was the perfect primer. Weather, karma and comeuppance are very closely related.

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My preferences can beat up your preferences’ dad.

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It snowed but it didn’t work out so well for Clark County. You would have done well but you were a fetus at the time and fetuses shouldn’t be out in the snow. KVUOsnowman had an epic meltdown. After a 2007-08 with so many near misses it was the perfect primer. Weather, karma and comeuppance are very closely related.

 

I was six, I wish I could say I vaguely remember the events of that day but I don't.

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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38 with light rain right now.

Springfield, Oregon regular season 2023-24 Stats:

  • Coldest high: 25F (Jan 14, 2024)
  • Coldest low: 20F (Jan 14, 2024)
  • Days with below freezing temps: 24 (Most recent: Mar 8, 2024)
  • Days with sub-40F highs: 4 (Most recent: Jan 16, 2024)
  • Total snowfall: 0.0"
  • Total ice: 2.25”
  • Last accumulating snowfall on roads: Dec 27, 2021 (1.9")
  • Last sub-freezing high: Jan 15, 2024 (27F)
  • Last White Christmas: 1990
  • Significant wind events (gusts 45+): 0

Personal Stats:

  • Last accumulating snowfall on roads: Dec 27, 2021
  • Last sub-freezing high: Jan 16, 2024 (32F)
  • Last White Christmas: 2008
  • Total snowfall since joining TheWeatherForums: 42.0"
  • Sub-freezing highs since joining TheWeatherForums: 4

 

Venmo

GoFundMe "College Basketball vs Epilepsy": gf.me/u/zk3pj2

My Twitter @CBBjerseys4hope

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Remember back when our climate was f*cked?

 

I remember last month all too well.

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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Remember back when our climate was f*cked?

Even if we get a big event it still won’t change the bigger picture of gradual warming. You know this as well as I. Promising looking model runs also don’t erase the unprecedented slew of warm records over the last 4-5 years, gradually drying and lengthening warm seasons, diminishing Cascade snow pack, shrinking alpine glaciers, etc etc.

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From the Portland NWS. I like how they removed "seasonal weather" from the discussion.

 

ONG TERM...Friday afternoon through Tuesday...A moderate low
pressure system (I`ll call it a BC slider) slides down the coast
Friday afternoon into Saturday. Ahead of this low, precipitation will
start to pick up, with a moderate amount of precipitation expected.
Precipitation will probably start as rain below 1000 feet, but the
exact track of the low will play a major role in when we see a
transition to snow down to sea level. Expect mostly rain below 1000
feet through Saturday morning. With a track closer to the coast, the
ECMWF brings cold air in from the north sooner and brings snow down
to sea level Saturday afternoon. The GFS on the other hand tracks a
little farther from the coast, which brings the cold air in more from
the east and later Saturday night. While 850 temperatures aren`t
excellent Saturday night in the GFS, with offshore flow we get into a
more continental air mass. The -6C to -8C typical range for low
elevation snow is more for a maritime air mass. Looking at
1000-500-mb thickness values of around 520dm (well below the
continental rule of thumb of 540dm), this is prime for a transition
to snow Saturday night as soon as flow starts to turn easterly. My
conceptual model is reflected in GFS model soundings Saturday night.
In any case, low elevation snow seems likely Saturday night into
Sunday.

This time the cold airmass stays more in place over our area with
several chances for showers early next week. Will probably see
additional chances for low elevation snow through at least Tuesday.
-McCoy 

  • Like 1

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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Snowier than the 12z so far.

 

Bit less for PDX, but Saturday night is our first chance for snow.

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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FXUS66 KSEW 052254

AFDSEW

 

Area Forecast Discussion

National Weather Service Seattle WA

253 PM PST Tue Feb 5 2019

 

.SYNOPSIS...Dry weather and cold temperatures will prevail for the

next couple days as weak high pressure is over the area. Another

round of lowland snow and windy conditions is possible Friday

afternoon into Saturday as another cold system arrives from

the north. The cold pattern will continue into early next week.

 

&&

 

.SHORT TERM /TONIGHT THROUGH FRIDAY/...Northerly flow near the

surface and aloft brought a mostly sunny but cold day to the region.

Some areas of stratocumulus that blossomed in the sun today will

dissipate this evening. Mostly clear skies and light surface winds

will herald another cold night ahead with widespread lows in the

teens and 20s. A weakening upper ridge will shift into the

Washington offshore waters on Wednesday while surface ridging over

the interior of British Columbia weakens. This will limit Fraser

outflow to little more than a trickle and high temperatures will

moderate further across Western Washington with some spots getting

into the lower 40s. A few high clouds will filter into the region

toward afternoon as an upper trough digs southward several hundred

miles offshore. This trough will dig southward into Oregon offshore

waters on Thursday with a thicker cloud shield spreading into the

region. Models keep the region dry on Thursday outside a stray

shower perhaps reaching the central coast. Thursday may well be the

warmest day of the bunch with high temperatures getting into the

lower 40s for most of the lowlands with the exception of the North

Interior.

 

Changes of perhaps everyone`s interest begin to take place Thursday

night into early Friday. Another system will dig southward out of

British Columbia with precipitation beginning in the North Interior

late Thursday night or early Friday and spreading southward through

the day. As always, the devil is in the details. The 12Z Euro has

heavier QPF than the 12Z GFS which could very well be in part to

some stronger easterly low level flow in the GFS. Both models keep

the low level thickness (1000-850 millibar) below 1300 meters for

the onset of precipitation. At the same time, it seems there will be

some degree of low level southerly flow developing from the Puget

Sound southward Friday evening before another Fraser outflow event

develops by Saturday. This, of course, makes for a potentially messy

forecast challenge in terms of potential snow amounts, when or if it

temporarily becomes mixed precipitation, etc. For now, it is best to

monitor late week forecasts closely. In many ways, this could

resemble the recent event, but model disagreements at this time

point to a wide array of potential snow amounts Friday night and

beyond.

 

.LONG TERM /SATURDAY THROUGH TUESDAY/...The Euro and GFS have

slightly different ideas with the track of the surface low on

Saturday, but both essentially place it somewhere (plus or minus

a hundred miles) west of the mouth of the Columbia River on Saturday

afternoon. The depth of the system will certainly play a factor,

but this is prime placement for additional snowfall on Saturday as

moisture wraps around the system (think of this past Monday). With

1000-850 millibar thicknesses of 1280 meters or lower for much of

the area, 850 millibar temperatures near -7 C, and gusty Fraser

River outflow increasing throughout Saturday, it would be hard to

imagine this not producing some noteworthy snow amounts for some of

the lowlands in Western Washington. Another system could potentially

follow this one on Monday, but looks weaker at this time than the

weekend system. February 2019 is shaping up to be memorable around

these parts. Watch this space. 27

 

 

&&

 

.AVIATION...Skies are mostly clear except for a couple patches of

clouds this afternoon--one area of clouds has been banked up against

the southeast side of the Olympics. There is an upper ridge just

offshore with northerly flow aloft over Western Washington. The air

is stable and should dry some more. High clouds will arrive later on

Wednesday.

 

 

KSEA...Mostly clear with a light northerly breeze.

 

&&

 

.MARINE...Gradients eased but there is still enough Fraser outflow

for a small craft advisory in the north. Another weather system will

arrive late in the week--probably from Friday afternoon into

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Even if we get a big event it still won’t change the bigger picture of gradual warming. You know this as well as I. Promising looking model runs also don’t erase the unprecedented slew of warm records over the last 4-5 years, gradually drying and lengthening warm seasons, diminishing Cascade snow pack, shrinking alpine glaciers, etc etc.

 

One big event/winter can do a lot to shape snowfall trends, though. 

 

This one might be arriving just in time to make the 2010s look pretty alright!

A forum for the end of the world.

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From the Portland NWS. I like how they removed "seasonal weather" from the discussion.

 

ONG TERM...Friday afternoon through Tuesday...A moderate low

pressure system (I`ll call it a BC slider) slides down the coast

Friday afternoon into Saturday. Ahead of this low, precipitation will

start to pick up, with a moderate amount of precipitation expected.

Precipitation will probably start as rain below 1000 feet, but the

exact track of the low will play a major role in when we see a

transition to snow down to sea level. Expect mostly rain below 1000

feet through Saturday morning. With a track closer to the coast, the

ECMWF brings cold air in from the north sooner and brings snow down

to sea level Saturday afternoon. The GFS on the other hand tracks a

little farther from the coast, which brings the cold air in more from

the east and later Saturday night. While 850 temperatures aren`t

excellent Saturday night in the GFS, with offshore flow we get into a

more continental air mass. The -6C to -8C typical range for low

elevation snow is more for a maritime air mass. Looking at

1000-500-mb thickness values of around 520dm (well below the

continental rule of thumb of 540dm), this is prime for a transition

to snow Saturday night as soon as flow starts to turn easterly. My

conceptual model is reflected in GFS model soundings Saturday night.

In any case, low elevation snow seems likely Saturday night into

Sunday.

 

This time the cold airmass stays more in place over our area with

several chances for showers early next week. Will probably see

additional chances for low elevation snow through at least Tuesday.

-McCoy

Haha. We have a dog named McCoy.

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My preferences can beat up your preferences’ dad.

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Uh oh, PDX NWS suggesting that snow is "likely" on Saturday and Sunday. This from the lates

This is why pro mets don't want to post here.  Believing in jinxes and thinking that the people on here know more about the weather than they do is pretty insulting to them, I would imagine.  Yes, they are wrong sometimes, but not as wrong as the amateurs around here are, and I have been on this forum since the beginning.  

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Get another one and call him Jaya.

"Let's mosey!"

 

--Cloud Strife

 

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

 

Top 5 Snow Events (post 2014):

 

(1. January 10th, 2017: 18.5 in.

(2. February 6th, 2014: 7.5 inches

(3. February 20th, 2018: 5.0 inches

(4. February 21st, 2018: 4.0 inches

(5. December 14th, 2016: 3.5 inches

 

Honourable Mentions: December 7th, 2018, February 9th, 2019.

 

Total since joining the Weather Forums: 3"

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Share on other sites

2-5-19 3:02 PM Model analysis, Snow storm thoughts

Here are some additional analysis and thoughts regarding the POTENTIAL for a Winter Storm (Poopers?) to impact WA/OR Friday evening and Saturday.

 

It is important to point out a few things and the major differences comparing the air mass ahead of the system Friday evening/Saturday to what we recently had Saturday night into this Tuesday morning. This is based on the 12z ECMWF, GEM, GFS NCEP, WRF, and to a bit lesser extent the FV3. The ICON was thrown out because Hasselhoff doesn't know what the Columbia Gorge is. It's also based on the current air mass, snow cover Gorge/east, and the coming east winds.

 

1) We already have the cold air in place. We didn't with this last Snow Dusting, Skiff-o-Matic Spectacular Event. We have cold, arctic air especially at lower levels in the Columbia Basin and it won't be going anywhere.

2) We have a snow covered Central/Eastern Gorge and Columbia Basin. It's not likely that will melt off ahead of the system Friday evening/Saturday. That will help the lower levels cool even further creating a 'refrigerator' effect if you will.

3) East winds should develop sometimes Wednesday. We didn't have that with this past cold shot. The widespread snow cover over the Columbia Basin will aid in developing high pressure, likely stronger than is modeled currently. Additionally with clearing skies the next 2 nights over there temps will plummet into the single digits and possibly below zero. This will develop a very strong and arctic cold pool. As east winds increase Wednesday night through Thursday that low level arctic air over the Columbia basin will be sucked westward through the Gorge chilling PDX metro further. A reinforcement shot of cold air. It will also thicken up the cold layer from 4000' to the surface, but ever so slightly less than in January due to higher sun angle in February.

4) As the system develops early Friday evening near Vancouver Island and drops south off the Washington coast early Saturday morning once it's about parallel with Ocean Shores/Long Beach that should begin to induce even more east winds keeping PDX very cold. It is possible immediate PDX metro is the only location that is sufficiently cold enough and areas south of Wilsonville are too warm as warmer air is pulled northward ahead of the low up the Willamette Valley. The exact track of the low is crucial for this. We want the low nearly hugging the Washington Coast as it drops south to minimize the warmer influence off the ocean and thus lessening any warm air advection. If it heads offshore further to our north than we won't see much of anything. *RIGHT NOW* no models show this, so relax. Okay.

5) Another key difference. This time the cold air source is from Northwest Territories, Alberta, Saskatchewan. The arctic trough digs towards us from the northeast with no warming influence from the Pacific ocean. The fact it's coming in sharply from the northeast and not rather down the BC Coast should drive arctic air rather easily into Eastern Washington and the Columbia Basin.

 

My thoughts: Based on all 12z runs I have growing consistency that PDX metro, Clark County in particular may see a Snow event/Storm late Friday night and Saturday. I'm currently at a 50-60% chance and leaving some wiggle room depending on how the upper level pattern is modeled the next 24-36 hours. If we didn't already have cold air in place going into this system and the snow cover in the Eastern Gorge, Columbia Basin I wouldn't be nearly as confident for snow. Any change in the upper level pattern Thursday through Friday to our north in the Northwest Territories, Alberta, and eastern British Columbia could "make or break" on whether or not we see snowfall. That will need to be watched carefully. The potential for a significant snow storm is there. Stay tuned!

Great analysis as usual DJ! I agree with you on the cold pool.

 

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Guest Sounder

This is why pro mets don't want to post here.  Believing in jinxes and thinking that the people on here know more about the weather than they do is pretty insulting to them, I would imagine.  Yes, they are wrong sometimes, but not as wrong as the amateurs around here are, and I have been on this forum since the beginning.  

Yep. No one with any professional investment in weather would want to risk their credibility by engaging much on here. It's fun for us weenies to get excited together on here, but this place is pretty unhinged.

 

There's certainly some very informed posters producing great analysis on here, don't get me wrong, but it's largely drowned out by people posting about what their weather.com app says and others genuinely becoming angry at WSWs being posted because of the "jinx".

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FXUS66 KSEW 052254

AFDSEW

 

Area Forecast Discussion

National Weather Service Seattle WA

253 PM PST Tue Feb 5 2019

 

.SYNOPSIS...Dry weather and cold temperatures will prevail for the

next couple days as weak high pressure is over the area. Another

round of lowland snow and windy conditions is possible Friday

afternoon into Saturday as another cold system arrives from

the north. The cold pattern will continue into early next week.

 

&&

 

.SHORT TERM /TONIGHT THROUGH FRIDAY/...Northerly flow near the

surface and aloft brought a mostly sunny but cold day to the region.

Some areas of stratocumulus that blossomed in the sun today will

dissipate this evening. Mostly clear skies and light surface winds

will herald another cold night ahead with widespread lows in the

teens and 20s. A weakening upper ridge will shift into the

Washington offshore waters on Wednesday while surface ridging over

the interior of British Columbia weakens. This will limit Fraser

outflow to little more than a trickle and high temperatures will

moderate further across Western Washington with some spots getting

into the lower 40s. A few high clouds will filter into the region

toward afternoon as an upper trough digs southward several hundred

miles offshore. This trough will dig southward into Oregon offshore

waters on Thursday with a thicker cloud shield spreading into the

region. Models keep the region dry on Thursday outside a stray

shower perhaps reaching the central coast. Thursday may well be the

warmest day of the bunch with high temperatures getting into the

lower 40s for most of the lowlands with the exception of the North

Interior.

 

Changes of perhaps everyone`s interest begin to take place Thursday

night into early Friday. Another system will dig southward out of

British Columbia with precipitation beginning in the North Interior

late Thursday night or early Friday and spreading southward through

the day. As always, the devil is in the details. The 12Z Euro has

heavier QPF than the 12Z GFS which could very well be in part to

some stronger easterly low level flow in the GFS. Both models keep

the low level thickness (1000-850 millibar) below 1300 meters for

the onset of precipitation. At the same time, it seems there will be

some degree of low level southerly flow developing from the Puget

Sound southward Friday evening before another Fraser outflow event

develops by Saturday. This, of course, makes for a potentially messy

forecast challenge in terms of potential snow amounts, when or if it

temporarily becomes mixed precipitation, etc. For now, it is best to

monitor late week forecasts closely. In many ways, this could

resemble the recent event, but model disagreements at this time

point to a wide array of potential snow amounts Friday night and

beyond.

 

.LONG TERM /SATURDAY THROUGH TUESDAY/...The Euro and GFS have

slightly different ideas with the track of the surface low on

Saturday, but both essentially place it somewhere (plus or minus

a hundred miles) west of the mouth of the Columbia River on Saturday

afternoon. The depth of the system will certainly play a factor,

but this is prime placement for additional snowfall on Saturday as

moisture wraps around the system (think of this past Monday). With

1000-850 millibar thicknesses of 1280 meters or lower for much of

the area, 850 millibar temperatures near -7 C, and gusty Fraser

River outflow increasing throughout Saturday, it would be hard to

imagine this not producing some noteworthy snow amounts for some of

the lowlands in Western Washington. Another system could potentially

follow this one on Monday, but looks weaker at this time than the

weekend system. February 2019 is shaping up to be memorable around

these parts. Watch this space. 27

 

 

&&

 

.AVIATION...Skies are mostly clear except for a couple patches of

clouds this afternoon--one area of clouds has been banked up against

the southeast side of the Olympics. There is an upper ridge just

offshore with northerly flow aloft over Western Washington. The air

is stable and should dry some more. High clouds will arrive later on

Wednesday.

 

 

KSEA...Mostly clear with a light northerly breeze.

 

&&

 

.MARINE...Gradients eased but there is still enough Fraser outflow

for a small craft advisory in the north. Another weather system will

arrive late in the week--probably from Friday afternoon into

Hmm. Lots of possibilities.

My preferences can beat up your preferences’ dad.

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I noticed Cliff Mass said today that the EURO is one of the best models in the world and what's funny about that is he always talk's about how it's the gold standard best model. I guess it's a bad model now that it proved the old hippie wrong.

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We come from the land of the ice and snow.

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I’ve picked up on that. I have my moments but try not to be. Seems strange for your profession.

Oddly, it has almost nothing to do with weather. It’s more of a sports thing or clothing related if I have court. Totally irrational. I will actually get up and walk across the room to knock on wood if I have to.

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My preferences can beat up your preferences’ dad.

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Snow?

 

Around here, pretty much. Besides drought. ;)

Sure. But there are many posters here that know the ins and outs of our region’s weather intimately enough to be pretty good at observing even subtle changes in climate. Something I value this place for, besides cheerleading big snow events of course.

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