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On This Day In History...Major Weather Events in the PNW or West

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#701
BLI snowman

Posted 13 April 2018 - 04:09 PM

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Yeah, could be. Though 1898/99 was a weak niña according to the JMA reconstruction, so I wonder if there was a major SSW in mid/late January of 1899. Hard to explain how such a monstrous -NAM (and poleward displacement of -AAM from the low latitudes) could have occurred, otherwise.

 

Given what happened in the first half of February, that wouldn't be surprising.



#702
wx_statman

Posted 13 April 2018 - 05:01 PM

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Given what happened in the first half of February, that wouldn't be surprising.

 

Agreed, a major SSW fits the bill there. 



#703
wx_statman

Posted 15 April 2018 - 01:51 PM

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Here's a follow up post to the one about WA state, but for OR. Highest April snowfall totals:

 

143.5" in 1948 @ Crater Lake

139.0" in 1955 @ Crater Lake

108.5" in 1982 @ Santiam Pass

108.0" in 1963 @ Crater Lake

95.2" in 1945 @ Timberline Lodge (too bad this station only existed 1938-1951)

91.5" in 1911 @ Musick (at only 5,000 feet in SW Oregon - epic month)

91.0" in 1932 @ Crater Lake

89.0" in 1967 @ Crater Lake

87.3" in 2003 @ Crater Lake

86.5" in 1993 @ Crater Lake

86.0" in 1955 @ Odell Lake

86.0" in 1937 @ Crater Lake

85.0" in 1899 @ Summit Guard Station (Government Camp)

 

*Incredibly, Summit Guard Station recorded 87.0" of snow in May 1896, higher than any April total in the combined Summit Guard Station/Government Camp period of record that extends back to 1895. May of 1896 also featured a remarkable cold trough that brought downtown Portland a 48/39 day on the 16th (the 5th sub-50 maximum that month), and snowfall down to the hills. The latter assertion is based on the fact that Ashford, at 1,700 feet, recorded 1.0" of snow on 5/16/1896, so flakes down to 1,000 feet were possible. 45" of snow buried Government Camp between May 11th-17th alone, the modern (1951-) record for the entire month is 32.0" in 1974. 

 

Just like with the WA post, here are some notable totals at lower elevations and/or drier locations:

 

37.3" in 1982 @ Marion Forks

32.5" in 1917 @ Joseph

29.0" in 1917 @ Ochoco Ranger Station

28.1" in 1982 @ Scotts Mills 9SE

26.0" in 1963 @ Austin

24.5" in 1955 @ Sundown Ranch, out beyond Silverton

24.0" in 1911 @ Detroit

23.7" in 1967 @ Bend

23.5" in 1967 @ Chiloquin

23.0" in 1967 @ Prospect

18.6" in 1929 @ Zigzag Ranger Station

16.0" in 1982 @ Cave Junction

15.0" in 1933 @ Klamath Falls

14.5" in 1963 @ Dayville

13.0" in 1935 @ Parkdale

11.0" in 1972 @ Valsetz

10.5" in 1972 @ Tillamook 13ENE

9.0" in 1948 @ Timber

9.0" in 1901 @ Glenora

8.0" in 1982 @ Illahe

7.5" in 1936 @ Headworks Portland (Bull Run)

5.3" in 1948 @ Falls City

5.2" in 1936 @ Downtown Portland

5.2" in 1936 @ Hood River

4.5" in 1936 @ Estacada

4.0" in 1901 @ Langlois

3.3" in 1896 @ Stafford

2.6" in 1911 @ Downtown Eugene

2.4" in 1953 @ Roseburg Airport

2.0" in 2008 @ Cloverdale

1.5" in 1903 @ Nehalem

1.1" in 2008 @ Florence

1.0" in 1929 @ Brookings

1.0" in 1936 @ Newport

0.2" in 1929 @ North Bend

0.1" in 1911 @ Port Orford

 



#704
SilverFallsAndrew

Posted 15 April 2018 - 02:12 PM

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Here's a follow up post to the one about WA state, but for OR. Highest April snowfall totals:

143.5" in 1948 @ Crater Lake
139.0" in 1955 @ Crater Lake
108.5" in 1982 @ Santiam Pass
108.0" in 1963 @ Crater Lake
95.2" in 1945 @ Timberline Lodge (too bad this station only existed 1938-1951)
91.5" in 1911 @ Musick (at only 5,000 feet in SW Oregon - epic month)
91.0" in 1932 @ Crater Lake
89.0" in 1967 @ Crater Lake
87.3" in 2003 @ Crater Lake
86.5" in 1993 @ Crater Lake
86.0" in 1955 @ Odell Lake
86.0" in 1937 @ Crater Lake
85.0" in 1899 @ Summit Guard Station (Government Camp)

*Incredibly, Summit Guard Station recorded 87.0" of snow in May 1896, higher than any April total in the combined Summit Guard Station/Government Camp period of record that extends back to 1895. May of 1896 also featured a remarkable cold trough that brought downtown Portland a 48/39 day on the 16th (the 5th sub-50 maximum that month), and snowfall down to the hills. The latter assertion is based on the fact that Ashford, at 1,700 feet, recorded 1.0" of snow on 5/16/1896, so flakes down to 1,000 feet were possible. 45" of snow buried Government Camp between May 11th-17th alone, the modern (1951-) record for the entire month is 32.0" in 1974.

Just like with the WA post, here are some notable totals at lower elevations and/or drier locations:

37.3" in 1982 @ Marion Forks
32.5" in 1917 @ Joseph
29.0" in 1917 @ Ochoco Ranger Station
28.1" in 1982 @ Scotts Mills 9SE
26.0" in 1963 @ Austin
24.5" in 1955 @ Sundown Ranch, out beyond Silverton
24.0" in 1911 @ Detroit
23.7" in 1967 @ Bend
23.5" in 1967 @ Chiloquin
23.0" in 1967 @ Prospect
18.6" in 1929 @ Zigzag Ranger Station
16.0" in 1982 @ Cave Junction
15.0" in 1933 @ Klamath Falls
14.5" in 1963 @ Dayville
13.0" in 1935 @ Parkdale
11.0" in 1972 @ Valsetz
10.5" in 1972 @ Tillamook 13ENE
9.0" in 1948 @ Timber
9.0" in 1901 @ Glenora
8.0" in 1982 @ Illahe
7.5" in 1936 @ Headworks Portland (Bull Run)
5.3" in 1948 @ Falls City
5.2" in 1936 @ Downtown Portland
5.2" in 1936 @ Hood River
4.5" in 1936 @ Estacada
4.0" in 1901 @ Langlois
3.3" in 1896 @ Stafford
2.6" in 1911 @ Downtown Eugene
2.4" in 1953 @ Roseburg Airport
2.0" in 2008 @ Cloverdale
1.5" in 1903 @ Nehalem
1.1" in 2008 @ Florence
1.0" in 1929 @ Brookings
1.0" in 1936 @ Newport
0.2" in 1929 @ North Bend
0.1" in 1911 @ Port Orford


I almost bought a house in 2011 about 1/2 mile from the the old Sundown Ranch station. Just needed a little to much work.

Snowfall

2017-18: 30.3"

2016-17: 49.2"

2015-16: 11.75"

2014-15: 3.5"
2013-14: 11.75"
2012-13: 16.75"
2011-12: 98.5"

 

 

Robert Mueller is a traitor to this nation.


#705
wx_statman

Posted 16 April 2018 - 01:47 PM

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I know March already passed, but I wanted to list some snowfall totals for March 1951. Such an amazing month!

 

114.3" at Spirit Lake, WA

108.5" at Odell Lake, OR

84.9" at Marion Forks, OR

78.4" at Sundown Ranch, OR

76.0" at Wind River, WA

73.7" at Longmire, WA

64.0" at Detroit, OR

61.0" at Vernonia, OR

51.5" at Cedar Lake, WA

51.0" at Three Lynx, OR

47.0" at Palmer, WA

39.5" at Falls City, OR

39.4" at Randle, WA

39.0" at Blaine, WA

38.5" at Forks, WA

35.5" at Sedro-Woolley, WA

34.7" at Quinault, WA

34.6" at Willamina, OR

34.5" at Bellingham, WA

30.0" at Clatskanie, OR

29.5" at Neah Bay, WA

29.5" at Duvall, WA

26.8" at Arlington, WA

25.8" at Mill Creek, WA

25.0" at Estacada, OR

24.7" at Tatoosh Island, WA

23.6" at McMinnville, OR

21.8" at Silverton, OR

21.0" at Forest Grove, OR

20.8" at Dallas, OR

20.6" at OLM

20.3" at Astor Experiment Station, OR

19.6" at Everett, WA

19.0" at Tillamook, OR

18.9" at Centralia, WA

18.5" at Cottage Grove, OR

18.2" at SEA

17.5" at Aberdeen, WA

15.8" at Elkton, OR

15.1" at Troutdale, OR

12.9" at PDX

12.8" at Astoria, OR

10.4" at Roseburg, OR



#706
Scott

Posted 18 April 2018 - 08:31 PM

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I looked at April snowfall numbers for WA state.

 

Highest monthly totals:

 

170.2" in 2011 @ Rainier Paradise

146.0" in 1991 @ Rainier Paradise

143.5" in 1972 @ Rainier Paradise

129.7" in 1937 @ Mount Baker Lodge

122.0" in 1974 @ Rainier Paradise

116.1" in 1955 @ Rainier Paradise

116.0" in 1937 @ Rainier Paradise

110.5" in 1981 @ Rainier Paradise

107.2" in 1970 @ Stampede Pass

106.0" in 1982 @ Rainier Paradise

105.5" in 1984 @ Rainier Paradise

105.0" in 1927 @ Mount Baker Lodge

105.0" in 1899 @ Monte Cristo

 

 

Some from Mount Baker (I can only find it separated by month since 2005):

124" in 2011
107" in 2010

 


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At home:

 

Coldest temperature thus far in 2018:   -26 on 2/21<

 

Warmest temperature thus far in 2018:  99 on 7/8 (All time record high

 

Precip thus far in 2018:   6.45 inches

 

Snowfall thus far in 2018:   35.7 inches


#707
Front Ranger

Posted 23 May 2018 - 05:18 PM

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On 5/22/2008, an EF-3 tornado carved a path of destruction 39 mi long in Weld County, CO - about 50 minutes northeast of me. The huge wedge tornado was up to a mile wide at times. 1 person was killed and over 300 homes were severely damaged or destroyed, mainly in the town of Windsor.

 

This remains the most significant severe weather event that's happened since I've lived here, and probably only second to the 1990 EF-3 tornado that destroyed the town of Limon (206 mph winds) when it comes to damaging twisters in CO.


Cool anomalies soothe the soul.


#708
Timmy_Supercell

Posted 04 June 2018 - 11:40 AM

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I think a lot of us know what happened 9 years ago today. One of the few times an outbreak of severe thunderstorms occurred west of the cascades. Both severe reports and radar presentations were pretty widespread for valley standards. 60-70mph winds, large hail and one tornado report in Linn County. I think to this day that was the last warm-core style tornado warned thunderstorm in the Willamette Valley. (This storm briefly exhibited supercell characteristics before and after it was tornado warned)

 

The first time in my life I saw a shelf cloud. Further south towards Salem and beyond there were pictures of what was clearly a wall cloud.

 

And it wasn't just the 4th of June, the ULL responsible for these storms had been producing literally daily convection in southern Oregon since late May. Klamath Falls for example was just finishing a rather incredible stretch of thunderstorms (8 days) when the severe weather occurred. That was about a year and a half before I moved to this town. 

 

It was a once-in-20-years kind of thing. Even if much of the population didn't experience severe weather - quite literally almost everyone from the cascades westward towards the coast, recorded some kind of thunderstorm. 

 

Some locations in the central and southern Willamette Valley had the kind of storm that even the town I live in now has not seen in several years, and I'm in an area much more prone to t'storm activity.


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Weather Data for Klamath Falls, OR

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

Snowfall (with % of seasonal average)

 

2010-2011 - 58.20" (161%)
2011-2012 - 49.00" (136%)
2012-2013 - 16.70" (46%)
2013-2014 - 9.05" (25%)
2014-2015 - 2.90" (8%)
2015-2016 - 54.45" (151%)
2016-2017 - 63.00" (175%)
2017-2018 - 18.10" (50%)
 
T'storm Days: 11 (2017), 12 (2016), 20 (2015), 21 (2014), 16 (2013), 2 (2012), 12 (2011) / 1980-2015 Avg = 12 T'storm Days
Severe T'storms: 4 (08/08/2017), (07/24/2017), (01/19/2016), (08/05/2012) 
"Almost" Severe - (08/10/2017), (05/04/2016)
Vicinity Severe T'storms (close enough to hear, with official severe reports)
(07/09/2015), (07/05/2015), (06/09/2015), (08/05/2014), (08/04/2014), (08/22/2013), (08/12/2013), (09/12/2011), (09/04/2011)

 


#709
Phil

Posted 05 June 2018 - 11:15 AM

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Ugh, that’s the one thing that makes me second-guess moving out west. I can’t imagine living without severe weather on a weekly to bi-weekly basis. It’s the only thing that gets my adrenaline pumping, except for hurricanes. Snow and cold are awesome, but not in the same way.

It’s why I hate the months of September and October around here. It’s just sooo boring 90% of the time.
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Personal Weather Station, Live Stream on Wunderground: https://www.wundergr...BETHE62#history

Warm Season 2018
90+ degree days: 5
Thunderstorm Days: 5
Severe Days: 1
Total rainfall: 1.77”
Highest Gust: 54mph
Warmest High: 94.6*F
Warmest low: 65.5*F

Live Weather Stream

#710
BLI snowman

Posted 05 June 2018 - 11:41 AM

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I think a lot of us know what happened 9 years ago today. One of the few times an outbreak of severe thunderstorms occurred west of the cascades. Both severe reports and radar presentations were pretty widespread for valley standards. 60-70mph winds, large hail and one tornado report in Linn County. I think to this day that was the last warm-core style tornado warned thunderstorm in the Willamette Valley. (This storm briefly exhibited supercell characteristics before and after it was tornado warned)

 

The first time in my life I saw a shelf cloud. Further south towards Salem and beyond there were pictures of what was clearly a wall cloud.

 

And it wasn't just the 4th of June, the ULL responsible for these storms had been producing literally daily convection in southern Oregon since late May. Klamath Falls for example was just finishing a rather incredible stretch of thunderstorms (8 days) when the severe weather occurred. That was about a year and a half before I moved to this town. 

 

It was a once-in-20-years kind of thing. Even if much of the population didn't experience severe weather - quite literally almost everyone from the cascades westward towards the coast, recorded some kind of thunderstorm. 

 

Some locations in the central and southern Willamette Valley had the kind of storm that even the town I live in now has not seen in several years, and I'm in an area much more prone to t'storm activity.

 

 

The Portland area experienced a very similar event 60 years ago day. A thermal trough moved onshore and the marine push was accompanied by a severe squall line that moved up the valley.

 

PDX measured its 2nd highest thunderstorm wind gust on record of 55mph, one of the few severe thunderstorm range speeds the city has officially seen. More storms moved in the following morning and dropped 1.70" of rain on PDX on the 6th, which is still the calendar day rainfall record for PDX during summer.


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#711
BLI snowman

Posted 05 June 2018 - 12:04 PM

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An even more impressive PNW severe event occurred on June 2-3, 1894, also during the midst of the most severe flood event on record in Portland.

 

As with our other severe events, a strong marine push moved in on top of an early season heat spike. Portland recorded a high of 90 on the 2nd and 56 on the 3rd, the largest one day drop on record for the city. 

 

On the afternoon of the 2nd, a very severe squall line moved up the Willamette Valley from the south and produced extremely strong wind, hail, and lightning. Cottage Grove reported "4" hail that broke windows" around 2:45pm. Downtown Portland recorded a sustained wind speed of 53mph around 4:15pm, meaning gusts probably got much higher, and likely made it the strongest thunderstorm wind speeds on record in the area. Many trees were reportedly toppled in the area and the winds in Portland were said to be the worst since the 1880 storm.

 

The severe thunderstorms moved north to at least Tacoma, where it was reported that wind speeds topped 50mph and over 2.5" of rain fell in less than 24 hours at rates described as the "heaviest ever known here".

 

The marine air moved east and triggered Oregon's worst tornado event on record on the morning of the 3rd. An estimated F2 tornado touched down south of Long Creek, OR and moved north into the town, staying on the ground for close to 10 miles and killing 3 people. To date this was the last fatal tornado in the state of Oregon.

 

Given the magnitude of that setup I'd have to imagine other brief tornadoes may have occurred in the region as well, but went unreported given the sparse populations of the time.


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#712
Phil

Posted 05 June 2018 - 12:42 PM

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The Portland area experienced a very similar event 60 years ago day. A thermal trough moved onshore and the marine push was accompanied by a severe squall line that moved up the valley.

PDX measured its 2nd highest thunderstorm wind gust on record of 55mph, one of the few severe thunderstorm range speeds the city has officially seen. More storms moved in the following morning and dropped 1.70" of rain on PDX on the 6th, which is still the calendar day rainfall record for PDX during summer.


Not to be a smartass, but technically speaking severe thunderstorm winds are classified as 58mph or higher. So in the ballbark, but a smidge short.

Still sounds like an awesome event, though.
Personal Weather Station, Live Stream on Wunderground: https://www.wundergr...BETHE62#history

Warm Season 2018
90+ degree days: 5
Thunderstorm Days: 5
Severe Days: 1
Total rainfall: 1.77”
Highest Gust: 54mph
Warmest High: 94.6*F
Warmest low: 65.5*F

Live Weather Stream

#713
BLI snowman

Posted 05 June 2018 - 01:00 PM

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Not to be a smartass, but technically speaking severe thunderstorm winds are classified as 58mph or higher. So in the ballbark, but a smidge short.

Still sounds like an awesome event, though.

 

I know, although with a number like that it's pretty reasonable to conclude that severe conditions may have been reached in the vicinity.


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#714
SilverFallsAndrew

Posted 05 June 2018 - 03:04 PM

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An even more impressive PNW severe event occurred on June 2-3, 1894, also during the midst of the most severe flood event on record in Portland.

 

As with our other severe events, a strong marine push moved in on top of an early season heat spike. Portland recorded a high of 90 on the 2nd and 56 on the 3rd, the largest one day drop on record for the city. 

 

On the afternoon of the 2nd, a very severe squall line moved up the Willamette Valley from the south and produced extremely strong wind, hail, and lightning. Cottage Grove reported "4" hail that broke windows" around 2:45pm. Downtown Portland recorded a sustained wind speed of 53mph around 4:15pm, meaning gusts probably got much higher, and likely made it the strongest thunderstorm wind speeds on record in the area. Many trees were reportedly toppled in the area and the winds in Portland were said to be the worst since the 1880 storm.

 

The severe thunderstorms moved north to at least Tacoma, where it was reported that wind speeds topped 50mph and over 2.5" of rain fell in less than 24 hours at rates described as the "heaviest ever known here".

 

The marine air moved east and triggered Oregon's worst tornado event on record on the morning of the 3rd. An estimated F2 tornado touched down south of Long Creek, OR and moved north into the town, staying on the ground for close to 10 miles and killing 3 people. To date this was the last fatal tornado in the state of Oregon.

 

Given the magnitude of that setup I'd have to imagine other brief tornadoes may have occurred in the region as well, but went unreported given the sparse populations of the time.

 

Every been to Long Creek? Some lonely country out there...


Snowfall

2017-18: 30.3"

2016-17: 49.2"

2015-16: 11.75"

2014-15: 3.5"
2013-14: 11.75"
2012-13: 16.75"
2011-12: 98.5"

 

 

Robert Mueller is a traitor to this nation.


#715
Phil

Posted 05 June 2018 - 03:05 PM

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I know, although with a number like that it's pretty reasonable to conclude that severe conditions may have been reached in the vicinity.


Very fair point.
Personal Weather Station, Live Stream on Wunderground: https://www.wundergr...BETHE62#history

Warm Season 2018
90+ degree days: 5
Thunderstorm Days: 5
Severe Days: 1
Total rainfall: 1.77”
Highest Gust: 54mph
Warmest High: 94.6*F
Warmest low: 65.5*F

Live Weather Stream

#716
BLI snowman

Posted 05 June 2018 - 05:09 PM

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Every been to Long Creek? Some lonely country out there...


No, it's on my bucket list.

#717
Timmy_Supercell

Posted 06 June 2018 - 09:35 AM

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The Portland area experienced a very similar event 60 years ago day. A thermal trough moved onshore and the marine push was accompanied by a severe squall line that moved up the valley.

 

PDX measured its 2nd highest thunderstorm wind gust on record of 55mph, one of the few severe thunderstorm range speeds the city has officially seen. More storms moved in the following morning and dropped 1.70" of rain on PDX on the 6th, which is still the calendar day rainfall record for PDX during summer.

 

Maybe I've forgotten about PDX stats, but second highest? Nearby cities have easily gotten 60+ in thunderstorms in the past and more than once. Makes me wonder if some events went missing. Does Jan 15 1996 register as one of the thunderstorm winds at PDX? That was yet another widespread squall line thunderstorm event (westerly squall) and even one tornado resulted in Lincoln City. Regardless of time of year that one should be logged as one of the important ones.

 

 

An even more impressive PNW severe event occurred on June 2-3, 1894, also during the midst of the most severe flood event on record in Portland.

 

As with our other severe events, a strong marine push moved in on top of an early season heat spike. Portland recorded a high of 90 on the 2nd and 56 on the 3rd, the largest one day drop on record for the city. 

 

On the afternoon of the 2nd, a very severe squall line moved up the Willamette Valley from the south and produced extremely strong wind, hail, and lightning. Cottage Grove reported "4" hail that broke windows" around 2:45pm. Downtown Portland recorded a sustained wind speed of 53mph around 4:15pm, meaning gusts probably got much higher, and likely made it the strongest thunderstorm wind speeds on record in the area. Many trees were reportedly toppled in the area and the winds in Portland were said to be the worst since the 1880 storm.

 

The severe thunderstorms moved north to at least Tacoma, where it was reported that wind speeds topped 50mph and over 2.5" of rain fell in less than 24 hours at rates described as the "heaviest ever known here".

 

The marine air moved east and triggered Oregon's worst tornado event on record on the morning of the 3rd. An estimated F2 tornado touched down south of Long Creek, OR and moved north into the town, staying on the ground for close to 10 miles and killing 3 people. To date this was the last fatal tornado in the state of Oregon.

 

Given the magnitude of that setup I'd have to imagine other brief tornadoes may have occurred in the region as well, but went unreported given the sparse populations of the time.

 

 

I remember a good read on the 1894 tornado in Long Creek. That possibly could have been an actual wedge tornado, maybe the first in the PNW of that magnitude? 

Yeah, not surprising that other tornadoes would go unreported in Oregon/Washington and also these had several different names over the years.

 

 

 

Not to be a smartass, but technically speaking severe thunderstorm winds are classified as 58mph or higher. So in the ballbark, but a smidge short.

Still sounds like an awesome event, though.

 

You're not wrong for pointing that out. Just a quick visit on SPC storm reports page from 06-04-2009 would show you that multiple wind reports were given a bit south of Portland. And my own personal recalling (from Hillsboro area) of winds that actually downed a tree and there was even a rare "outflow boundary" which was radar indicated, though this was around the time the storms happened to weaken, but regardless PDX was not the only site to consider on a day like that when things happened in so many other locations. 


Weather Data for Klamath Falls, OR

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

Snowfall (with % of seasonal average)

 

2010-2011 - 58.20" (161%)
2011-2012 - 49.00" (136%)
2012-2013 - 16.70" (46%)
2013-2014 - 9.05" (25%)
2014-2015 - 2.90" (8%)
2015-2016 - 54.45" (151%)
2016-2017 - 63.00" (175%)
2017-2018 - 18.10" (50%)
 
T'storm Days: 11 (2017), 12 (2016), 20 (2015), 21 (2014), 16 (2013), 2 (2012), 12 (2011) / 1980-2015 Avg = 12 T'storm Days
Severe T'storms: 4 (08/08/2017), (07/24/2017), (01/19/2016), (08/05/2012) 
"Almost" Severe - (08/10/2017), (05/04/2016)
Vicinity Severe T'storms (close enough to hear, with official severe reports)
(07/09/2015), (07/05/2015), (06/09/2015), (08/05/2014), (08/04/2014), (08/22/2013), (08/12/2013), (09/12/2011), (09/04/2011)

 


#718
BLI snowman

Posted 06 June 2018 - 10:22 AM

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Maybe I've forgotten about PDX stats, but second highest? Nearby cities have easily gotten 60+ in thunderstorms in the past and more than once. Makes me wonder if some events went missing. Does Jan 15 1996 register as one of the thunderstorm winds at PDX? That was yet another widespread squall line thunderstorm event (westerly squall) and even one tornado resulted in Lincoln City. Regardless of time of year that one should be logged as one of the important ones.

 

 

I think PDX topped out at 50mph with the 1996 squall line, so that one is definitely among the stronger convective events in the PDX era. I consider 4/5/1972 to be the the strongest thunderstorm related wind speed at PDX, which hit 63mph that day and was just a mile or so SE of where the tornado touched down.

 

There have been some documented microbursts west of the Cascades that certainly have produced 60+mph speeds, most recently the one in Lacey last May that was estimated in excess of 70mph. But in that event, just a few miles away at OLM, the peak wind speed was 49mph. It's just difficult to get a major reporting station to reflect those higher numbers given the localized nature of our most intense storms.


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