A collapsing thunderstorm brought a gusty outflow around the Deer Park area.
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The episode as NWS OTX wrote it up.
A collapsing thunderstorm brought a gusty outflow around the Deer Park area.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Spokane, WA wrote its last area forecast discussion before the first event at Aug 10, 2:21 PM PST, 3 hours 44 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 321 PM PDT Sat Aug 10 2024 .SYNOPSIS... Showers and thunderstorms will expand across the region this afternoon. Lightning from thunderstorms will be capable of starting new fires. Thunderstorms will also come with brief heavy rain and gusty outflow winds. There is a growing threat for nocturnal thunderstorms over southeast Washington into the Idaho Panhandle Sunday night into Monday morning. Thunderstorms will also be possible in the afternoon and again on Tuesday. Most of them will occur over the northern third of eastern Washington into the northern half of the Idaho Panhandle. Quieter weather looks likely for the middle of the week, but thunder chances will rise once again by the end of the work week. Daytime temperatures will begin the week slightly warmer than normal but should drop to average or slightly below by midweek. && .DISCUSSION... This afternoon and tonight: Isolated to scattered showers and thunderstorms will impact parts of the Inland NW. An unstable upper trough and smaller scale embedded disturbances will continue to migrate across the region through about 06Z, before subtle shortwave ridging develops overnight. With daytime heating and convective instability and the timing of the features, this will keep the best chance of showers before midnight. One area of showers and thunderstorms has been found around the mountains near the ID/MT border and these will continue to pulse up, while they shift east. A second area of showers and thunderstorms is also developing around the Cascades. As the subtle shortwave initiating this activity shifts east across the Cascades, this latter activity is expected to propagate eastward too. The best chances will be near the Cascades and central before 03Z, then expand eastward between 03Z-06Z. The high-resolution convective models differ on just how robust these get or just how much a line develops and some of them weaken the line as it pushes east, especially away from the mountains. So confidence in how much may reach the Spokane/C'dA metro area is degraded. So this will not be a certain shower/t-storm risk for anyone. Additionally, high- resolution models continue to support this line pushing east with briefly gusty winds, potentially gusting near 40 mph as it passes. This can happen even if the line weakens enough to no pass some areas with much actual precipitation. This tends to wash out as it is heading toward Idaho. Overall some of thunderstorms this evening will bring the risk for heavy downpours, gusty winds and lightning, as well as perhaps some small hail. Heading past 05-06Z the risk for precipitation wanes and skies clear out. Sunday into Tuesday: Another potential for showers and thunderstorms comes to the region. Sunday is expected to start off dry, then the next shortwave starts to move in. Shower/t-storm chances expand over the northern mountains Sunday afternoon and evening. Then Sunday night into Monday morning the shortwave continues to pivot into the region in and some elevated instability starts to migrate into the southeastern CWA. A risk for showers/t-storms expands over the Blue Mountains Sunday evening, expanding toward the L-C Valley, Camas Prairie, Palouse and central Panhandle. Chances may also push as far north as Spokane/C'dA area. This nocturnal/elevated convection will have a faster storm motion, compared to some of the more recent storms. That will increase the potential for dry lightning (i.e. thunderstorms without a wetting rain, i.e. <0.10 inches of precipitation). They could push through with 20 mph or so winds. This could be a concern from a fire weather standpoint as any lightning started wildfires could be fanned, at least initially. By Monday afternoon the overall unstable upper trough and heating of the day will lead to overall increased coverage in shower and thunderstorms chances, with the better risk around the mountain zones by then. Monday night the threat wanes but we will have to watch for another wave slipping by the southeast for a continued risk for nocturnal elevated showers/t-storms. The threat wanes some into Tuesday morning, then expands a little bit in the afternoon near the Cascades and central Panhandle mountains. Overall, however, Tuesday looks like a drier day. Wednesday to Saturday: The Inland NW will be in an evolving weather pattern, which starts off relatively quiet then comes with the potential deeper upper low moving on the region heading into next week. Wednesday to early Thursday looks dry with a weak col or ridge in the region. Look for limited cloud cover too. Later Thursday into the weekend the models starts to deepen a low pressure trough around the coastline and perhaps start to shift it inland toward the latter part of next weekend. Overall this will bring increasing shower chances late Thursday into the weekend, though right now the best risk sits in the mountains until late Friday into Saturday. As for temperatures: expect above normal temperatures through Monday, then cooler than normal readings Tuesday and Wednesday, moderation toward the latter part of the work week before trending back down toward next Saturday. This translates to upper 80s and 90s on the above normal days and upper 70s to mid-80s on below normal days. /Solveig && .AVIATION... 00Z TAFS: Showers and thunderstorms will increase in coverage this afternoon. Development of convection will favor the Cascades and northern mountains of eastern Washington, but is also expected to move off the higher terrain this late afternoon and evening. Convection will wane with the loss of surface heating with lingering showers expected overnight. T-storms will carry the potential for brief heavy downpours, gusty winds and small hail. Even if precipitation does not shift across TAF sites, the resulting outflow could produce wind gusts near 25-35kts this evening, mainly before 05Z. FORECAST CONFIDENCE AND/OR ALTERNATE SCENARIOS: Confidence is high for VFR conditions except if a thunderstorm moves over an airport. In this scenario, IFR to MVFR conditions with reduced visibility is possible. There is about a 10-20% chance of -tsra at EAT, MWH, GEG, SFF, COE. However they may not hold together as they push off the higher terrain and move across the Columbia Basin, falling apart before the Spokane/C'dA area. Thus the lower confidence in actual precipitation coming into TAF sites. ----------------------- Confidence descriptors: Low - Less than a 30 percent chance Moderate - 30 to 70 percent chance High - Greater than a 70 percent chance For additional probabilistic information for NWS Spokane airports, please refer to the Aviation Dashboard on our webpage: https:/www.weather.gov/otx/avndashboard && .PRELIMINARY POINT TEMPS/POPS... Spokane 60 89 62 87 57 80 / 30 10 20 20 10 10 Coeur d'Alene 57 86 61 86 55 78 / 30 20 10 20 10 10 Pullman 55 86 57 83 52 75 / 20 10 20 20 20 20 Lewiston 66 96 68 93 63 84 / 10 10 20 20 20 20 Colville 47 88 49 86 48 83 / 30 20 10 20 10 10 Sandpoint 53 84 57 84 53 78 / 30 20 10 20 10 10 Kellogg 60 83 64 84 58 75 / 20 20 10 20 20 10 Moses Lake 59 91 61 89 56 84 / 20 0 0 10 10 0 Wenatchee 67 91 66 88 62 84 / 20 10 10 10 0 0 Omak 62 93 64 92 62 89 / 30 20 10 30 10 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
Special Weather Statement
National Weather Service Spokane WA
216 PM PDT Sat Aug 10 2024
IDZ004-102145-
Central Panhandle Mountains ID-
216 PM PDT Sat Aug 10 2024
...A strong thunderstorm will impact portions of central Shoshone
County through 245 PM PDT...
At 215 PM PDT, Doppler radar was tracking a strong thunderstorm 11
miles north of Mullan, or 11 miles northeast of Osburn, moving east
at 10 mph.
HAZARD...Winds in excess of 40 mph and penny size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Murray.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4757 11573 4759 11591 4766 11596 4773 11578
4770 11572 4765 11573 4763 11570 4760 11569
TIME...MOT...LOC 2115Z 256DEG 9KT 4764 11584
MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH
VTSpecial Weather Statement
National Weather Service Spokane WA
431 PM PDT Sat Aug 10 2024
WAZ043-049-110000-
Western Okanogan County WA-Okanogan Valley WA-
431 PM PDT Sat Aug 10 2024
...A strong thunderstorm will impact portions of north central
Douglas and southwestern Okanogan Counties through 500 PM PDT...
At 430 PM PDT, Doppler radar was tracking a strong thunderstorm 7
miles west of Brewster, or 30 miles southwest of Omak, moving east at
15 mph.
HAZARD...Winds in excess of 30 mph and pea size hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Pateros and Methow.
This includes U.S. Highway 97 in Washington between mile markers 251
and 257.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.
&&
LAT...LON 4806 12008 4813 12008 4816 11981 4800 11986
TIME...MOT...LOC 2330Z 279DEG 14KT 4808 11994
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
JCLEVSpecial Weather Statement
National Weather Service Spokane WA
540 PM PDT Sat Aug 10 2024
WAZ034-035-044-110115-
Moses Lake Area WA-Waterville Plateau WA-Upper Columbia Basin WA-
540 PM PDT Sat Aug 10 2024
...A strong thunderstorm will impact portions of south central
Douglas and central Grant Counties through 615 PM PDT...
At 539 PM PDT, Doppler radar was tracking a strong thunderstorm 13
miles northwest of Lakeview, or 27 miles east of Wenatchee, moving
east at 35 mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Ephrata, Lakeview, Soap Lake, and Laveview Park.
This includes U.S. Highway 2 in Washington between mile markers 169
and 170.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
If on or near Lenore Lake and Soap Lake, get out of the water and
move indoors or inside a vehicle. Remember, lightning can strike out
to 10 miles from the parent thunderstorm. If you can hear thunder,
you are close enough to be struck by lightning. Move to safe shelter
now! Do not be caught on the water in a thunderstorm.
&&
LAT...LON 4741 11989 4759 11984 4759 11943 4732 11949
TIME...MOT...LOC 0039Z 286DEG 29KT 4749 11974
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
JCLEVSpecial Weather Statement
National Weather Service Spokane WA
644 PM PDT Sat Aug 10 2024
WAZ034-035-044-110215-
Moses Lake Area WA-Waterville Plateau WA-Upper Columbia Basin WA-
644 PM PDT Sat Aug 10 2024
...Strong thunderstorms will impact portions of southeastern Douglas,
west central Lincoln and east central Grant Counties through 715 PM
PDT...
At 643 PM PDT, Doppler radar was tracking strong thunderstorms along
a line extending from 11 miles east of Banks Lake South to 7 miles
north of Lakeview. Movement was southeast at 15 mph.
HAZARD...Winds in excess of 30 mph and half inch hail.
SOURCE...Radar indicated.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Banks Lake South, Soap Lake, Coulee City, Almira, Wilson Creek,
Hartline, and Stratford.
This includes U.S. Highway 2 in Washington between mile markers 191
and 193, and between mile markers 196 and 211.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.
&&
LAT...LON 4764 11857 4727 11933 4747 11962 4775 11903
TIME...MOT...LOC 0143Z 301DEG 12KT 4768 11904 4748 11946
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...30 MPH
JCLEVThe Spokane radar (KOTX), 27 km away, was scanning. The volume nearest the first event began at 02:06 UTC.
1 thunderstorm wind. Local standard time, as filed.
Multiple large down branches reported on Social Media. A mobile home roof was also damaged. Time estimated from radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2024Every state in 2024This day in weather historyWarnings in Washington, August 2024
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 1214158.