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WW 237 SEVERE TSTM ID WA 302315Z - 310600Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 237
NWS Storm Prediction Center Norman OK
415 PM PDT Sat May 30 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
The Idaho Panhandle
Central and eastern Washington
* Effective this Saturday afternoon and evening from 415 PM until
1100 PM PDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 80
mph likely
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
A tornado or two possible
SUMMARY...Clusters of severe storms, including supercells and bowing
segments, will move northward from Oregon into Washington and the
Idaho Panhandle the remainder of this afternoon through late
evening. The storm environment is favorable for both damaging
winds, some of which could be significant, and large hail. An
isolated tornado cannot be ruled out.
The severe thunderstorm watch area is approximately along and 100
statute miles east and west of a line from 65 miles south southeast
of Ephrata WA to 55 miles northeast of Omak WA. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for severe thunderstorms in and close to the watch area.
Persons in these areas should be on the lookout for threatening
weather conditions and listen for later statements and possible
warnings. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 236...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 70 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
21045.
...Thompson
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WW 0237 Status Updates
STATUS REPORT ON WW 237
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..JEWELL..05/31/20
ATTN...WFO...OTX...
STATUS REPORT FOR WS 237
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
IDC009-017-021-055-057-061-069-079-310340-
ID
. IDAHO COUNTIES INCLUDED ARE
BENEWAH BONNER BOUNDARY
KOOTENAI LATAH LEWIS
NEZ PERCE SHOSHONE
WAC001-003-007-017-019-023-025-043-047-051-063-065-075-310340-
WA
. WASHINGTON COUNTIES INCLUDED ARE
ADAMS ASOTIN CHELAN
DOUGLAS FERRY GARFIELD
GRANT LINCOLN OKANOGAN
PEND OREILLE SPOKANE STEVENS
WHITMAN
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
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WW 0236 Status Updates
STATUS REPORT ON WW 236
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 W BKE TO
25 SW PDT TO 40 W PDT TO 30 ENE DLS TO 40 WNW DLS AND 50 SSW BKE
TO 60 SE EUG.
..JEWELL..05/31/20
ATTN...WFO...PDT...BOI...MFR...
STATUS REPORT FOR WS 236
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC049-059-061-063-310140-
OR
. OREGON COUNTIES INCLUDED ARE
MORROW UMATILLA UNION
WALLOWA
WAC005-013-021-037-039-071-077-310140-
WA
. WASHINGTON COUNTIES INCLUDED ARE
BENTON COLUMBIA FRANKLIN
KITTITAS KLICKITAT WALLA WALLA
YAKIMA
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
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MD 0771 CONCERNING SEVERE THUNDERSTORM WATCH 237... FOR CENTRAL AND EASTERN WASHINGTON...NORTHEAST OREGON...NORTHERN IDAHO
Mesoscale Discussion 0771
NWS Storm Prediction Center Norman OK
1006 PM CDT Sat May 30 2020
Areas affected...central and eastern Washington...northeast
Oregon...northern Idaho
Concerning...Severe Thunderstorm Watch 237...
Valid 310306Z - 310500Z
The severe weather threat for Severe Thunderstorm Watch 237
continues.
SUMMARY...Severe wind gusts remain possible over northeast
Washington into northern Idaho. Isolated hail is possible as well.
DISCUSSION...A severe line of storms with damaging outflow winds
continues to move rapidly north across eastern WA where instability
remains sufficient given the organization of this system. South of
there, much of the area has been stabilized due to outflow. However,
minimal instability may exist in pockets, perhaps elevated, and
additional isolated strong/severe storms cannot be ruled out as
cooling aloft with the shortwave trough continues toward the region.
Marginal wind or hail is possible with any additional storms that
may develop behind the initial convective system, but additional
watches are not anticipated.
..Schneider.. 05/31/2020
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...MSO...OTX...PDT...
LAT...LON 45821864 46001943 46402022 47082025 48221957 48991882
49011645 48841575 47681504 46721508 46071596 45831681
45731796 45821864
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SPC 0100Z Day 1 Outlook
Day 1 Convective Outlook
NWS Storm Prediction Center Norman OK
0748 PM CDT Sat May 30 2020
Valid 310100Z - 311200Z
...THERE IS AN ENHANCED RISK OF SEVERE THUNDERSTORMS ACROSS PORTIONS
OF EASTERN WA...
...SUMMARY...
Scattered severe thunderstorms, offering destructive winds and hail,
are expected to continue through roughly 10 PM PDT over parts of the
interior Pacific Northwest, east of the Cascades.
...Pacific Northwest...
Earlier thinking, regarding the development of an MCS east of the
Cascades, remains. Latest radar data suggests several thunderstorm
clusters have evolved into a complex of storms over southern WA.
This activity is being aided by the exit region of a strong upper
jet that is translating into the northern Rockies. Latest diagnostic
data suggests ample buoyancy resides across eastern WA into western
MT for the maintenance of ongoing MCS as it propagates toward
southeast BC. Current speed/movement of this complex suggests the
back edge should approach the international border by 05z.
..Darrow.. 05/31/2020
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