September 2023 Weather in the PNW

[Phil]

Can see the transient period of subsidence east of the dateline associated with the cycle of ridging upcoming.

Opposes the niño circulation so likely won’t last long. Can also see the CCKW/MJO thru which it manifests.

[Phil]

And remember the teleconnection w/ PNW climo reverses come D/J/F. P8 RMM/LP is a cool and/or stormy signal during autumn but full blown ridgy come January.

And Vice versa for higher frequency bouts of Pacific subsidence like this one. Currently it’s a warm signal, come January it’s a cool/wet signal. Statistically speaking, in this case.

[Deweydog]

2 hours ago, TT-SEA said:

October.  

Agreed.

[snow maniac]

Brrrr 32 degrees this morning lite frost on grass.

[TT-SEA]

14 minutes ago, snow maniac said:

Brrrr 32 degrees this morning lite frost on grass.

Meanwhile 51 at SEA and 48 in North Bend due to persistent low clouds overnight.  

[TT-SEA]

8 hours ago, SilverFallsAndrew said:

70s in early October is nothing to write home about. 

Big change from yesterday when a typical October warm spell was the immoral destruction of our entire ecosystem.   Troll much?  

[snow maniac]

Just now, TT-SEA said:

Meanwhile 51 at SEA and 48 in North Bend due to persistent low clouds overnight.  

Yep, But its been clear here all night. Just some ground fog

[GHweatherChris]

33 and frosty here this morning, this is the first time I have seen frost in September out this way, at least I don't remember it happening any other time.

[ShawniganLake]

39 here with a very light frost on some surfaces.  

[Ellsworb]

46 and overcast skies on the east shore of lake tapps.  The lake always keeps us just a few degrees warmer than stations just 1/8 sm away. . .reporting 43 and 44 right now respectively.

[ShawniganLake]

12 hours ago, Port Angeles Foothiller said:

Then the records I have are garbage. Either way latest/earliest frost for me in 7 years

Temperature doesn’t tell the whole story for agriculture.  You should calculate the growing degree days for those years and get back to us. 

[Rubus Leucodermis]

43.0˚F. Broke down and turned on the heat.

[MossMan]

Haven’t hit the 30’s yet during this arctic blast. 

41 for a low. 

[KeyPeninsula_Wx]

56 minutes ago, GHweatherChris said:

33 and frosty here this morning, this is the first time I have seen frost in September out this way, at least I don't remember it happening any other time.

There’s a good chance that it could’ve happened in late September/early October 2019. There was some record setting cold that year. Bad sign for winter! 

[KeyPeninsula_Wx]

Got down to 47 here this morning. Coldest low so far this fall was 44 a couple weeks ago. 

[AmunRAEL]

48° here at Eastside Tacoma this morning should be cooler tonight into tomorrow morning

[MossMan]

10 minutes ago, TacomaWx said:

There’s a good chance that it could’ve happened in late September/early October 2019. There was some record setting cold that year. Bad sign for winter! 

Looked like my first frost that year was on 10/9

At least according to my 40,000 picture archive on my phone. 

[GHweatherChris]

19 minutes ago, TacomaWx said:

There’s a good chance that it could’ve happened in late September/early October 2019. There was some record setting cold that year. Bad sign for winter! 

It got chilly then but no frost until sometime in October.

[KeyPeninsula_Wx]

7 minutes ago, MossMan said:

Looked like my first frost that year was on 10/9

At least according to my 40,000 picture archive on my phone. 

That is surprising. We had our first frost here on 10/1 with a low of 36. We had our first freeze on 10/10 that year very early for this area. 

[KeyPeninsula_Wx]

Just now, GHweatherChris said:

It got chilly then but no frost until sometime in October.

Ah that makes sense then. 

[MossMan]

18 minutes ago, TacomaWx said:

That is surprising. We had our first frost here on 10/1 with a low of 36. We had our first freeze on 10/10 that year very early for this area. 

This is the only picture I have from the 1st. Perhaps that cat at work was named Frosty though? Can’t remember. 

[Phishy Wx]

clouds kept us in the upper 30s last night.  clear to partly cloudy tonight may allow the first frost of the season

[Snownerd3000]

13 hours ago, Frontal Snowsquall said:

Are we headed into October or are we headed into June?  

I might be sweating my balls off picking pumpkins this year but at least we won't have the smoke like last year.

[Anti Marine Layer]

1 minute ago, Snownerd3000 said:

I might be sweating my balls off picking pumpkins this year but at least we won't have the smoke like last year.

78 is not hot.

[Phishy Wx]

6 minutes ago, Anti Marine Layer said:

78 is not hot.

it's pretty warm for October

[Chewbacca Defense]

5 minutes ago, Anti Marine Layer said:

78 is not hot.

Says the guy who lives in So Cal.  40 degrees is not cold, I still walk around in sandals and shorts.  I had to laugh when I was in Huntington Beach a few weeks ago at people bundled up wearing sweaters and jackets when it was about 68-70 in the evening. We went to a bar that had the gas fire pit table things, and a few people were actually sitting up and leaning in towards them.

 

It's all about where you live and what you are used to.  For a LOT of people up here, 78 is Hot.  Not Tim though....

[Phil]

9 minutes ago, Chewbacca Defense said:

Says the guy who lives in So Cal.  40 degrees is not cold, I still walk around in sandals and shorts.  I had to laugh when I was in Huntington Beach a few weeks ago at people bundled up wearing sweaters and jackets when it was about 68-70 in the evening. We went to a bar that had the gas fire pit table things, and a few people were actually sitting up and leaning in towards them.

 

It's all about where you live and what you are used to.  For a LOT of people up here, 78 is Hot.  Not Tim though....

A dewpoint below 70 is not humid or muggy, either.

Fr, there’s barely a factorable heat index at that point. But, alas..

[Phil]

4 hours ago, snow maniac said:

Brrrr 32 degrees this morning lite frost on grass.

Lucky. I’ve never recorded a freeze in September. Skeeters still swarming like it’s the end times.

4 hours ago, TT-SEA said:

Big change from yesterday when a typical October warm spell was the immoral destruction of our entire ecosystem.   Troll much?  

A lot of Andrew’s “trolling” is just a projection of his emotional state. I’m pretty sure he’s actually an empath, beneath it all.

[Phil]

11 hours ago, Phil said:

Can see the transient period of subsidence east of the dateline associated with the cycle of ridging upcoming.

Opposes the niño circulation so likely won’t last long. Can also see the CCKW/MJO thru which it manifests.

CMC now on board with EPS/GEFS. NPJ/STJ breaks through as the CCKW propagates east and convection returns to the central equatorial pacific and +dAAMt commences.

[Cold Snap]

Low of 40 this morning. So close to getting into the 30s. Might be able to pull it off tonight.

[Phil]

12z Euro also more aggressive w/ the STJ breaking through week-2.

[TT-SEA]

1 hour ago, Phil said:

12z Euro also more aggressive w/ the STJ breaking through week-2.

EPS agrees.

[Phishy Wx]

[Rubus Leucodermis]

9 minutes ago, Phishy Wx said:

Those sorts of conditions really are not too unusual for the first half of October.

[Phishy Wx]

6 minutes ago, Rubus Leucodermis said:

Those sorts of conditions really are not too unusual for the first half of October.

exactly

[Front Ranger]

Some chilly September lows this morning.

Shelton: 31

OLM: 35

Arlington: 36

As far as I can tell, Shelton has only been colder once before in September...1972.

[Omegaraptor]

39 minutes ago, Front Ranger said:

Some chilly September lows this morning.

Shelton: 31

OLM: 35

Arlington: 36

As far as I can tell, Shelton has only been colder once before in September...1972.

Astoria fell to 39 as well. Not often Astoria has a colder low temp than Sunriver.

[TT-SEA]

Not a warm day... but beautiful.   60 at SEA and in North Bend with sun and a few puffy clouds.  

[Phishy Wx]

still in the low 50s here.  mostly cloudy with a slight breeze

[TT-SEA]

Not sure when Alaskan cruises end their season... but cruise ships are still embarking in downtown Seattle.