Isolated thunderstorm over North Washington caused minor damage and power outages.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS OTX wrote it up.
Isolated thunderstorm over North Washington caused minor damage and power outages.
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 Sep 3, 1:20 PM PST, 4 hours 15 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 220 PM PDT Sun Sep 3 2023 .SYNOPSIS... Cooler and breezy weather continues into Monday, with showers and embedded thunderstorms. As an upper low over northern California shifts east, it's replaced by a northwest flow over the region. The rest of the work week looks seasonal. Limited shower chances will be found near the Canadian border Tuesday, then around the mountains and parts of the Idaho Panhandle Wednesday. && .DISCUSSION... Tonight through Tuesday: Much discussed upper level low to the south has opened up and is making progress eastward while a cold front moves west to east through Eastern Washington and North Idaho tonight. The expectation is there will still be enough dynamic forcing, either along or ahead of the passing cold front or from other shortwaves moving up from the north that are associated with the earlier discussed opened up upper level low, to keep a mention of showers, and even minor mention of potentiTuesday night to Sunday: The Inland NW will see limited shower chances, with occasional breezy conditions and moderating temperatures. The next system move into the region between Tuesday night and Wednesday. Models paint the primary moisture feed with PWATs around 100-120% of normal near to just southeast of our CWA. While there is modest lift, the limited moisture and instability will keep the primary shower chances around the Cascades, Canadian border and then over the central and southern ID Panhandle, with the potential for some sprinkles over far southeast WA. This is slightly lower precipitation coverage compared to model depictions from yesterday. A limited chance of thunderstorms lingers near the central Panhandle mountains too. However look for breezy conditions Wednesday, with gusts of 15-20 mph locally near 30 mph through the Cascade gaps and downwind of the Blues Mountains. Another weak wave passes around Friday, with some light shower/sprinkle chances over far SE WA and the central and southern ID Panhandle. Another front pushes toward the region next weekend, with limited shower chances near the central ID Panhandle mountain Saturday and then around the the Cascades and in limited fashion near the Canadian border mountains, but otherwise limited chances elsewhere. Temperatures will be near normal much of this period, save for Saturday when temperatures push slightly above normal ahead of the weekend cold front. /Solveigal for short lived weak thunderstorms. Most apparent will be the robust westerly winds through the Cascade Gaps and into unsheltered lowlands including the Columbia Basin that will continue tonight, with a slight decrease late. As all these features translate to the east so too will the moisture feed. As such for Monday and Monday night the higher pops and QPF will focus over Extreme Northeast Washington and North Idaho with an expanding rain-shadow extending from the Cascades and encompassing much of the lowlands including the Columbia Basin. Upper level shortwave ridging moves in for the remainder of Monday night and Tuesday however minor pops near the Northern British Columbia Border and Cascade crest remain in place to address any convection that may occur with what looks like another weak disturbance running west to east thru this building upper level shortwave ridging (This shows up much better in the vorticity fields of some of the deterministic runs rather than the NBM). Monday stands out to be the coolest of the seven day forecast given it's post cold front status. /Pelatti Tuesday night to Sunday: The Inland NW will see limited shower chances, with occasional breezy conditions and moderating temperatures. The next system move into the region between Tuesday night and Wednesday. Models paint the primary moisture feed with PWATs around 100-120% of normal near to just southeast of our CWA. While there is modest lift, the limited moisture and instability will keep the primary shower chances around the Cascades, Canadian border and then over the central and southern ID Panhandle, with the potential for some sprinkles over far southeast WA. This is slightly lower precipitation coverage compared to model depictions from yesterday. A limited chance of thunderstorms lingers near the central Panhandle mountains too. However look for breezy conditions Wednesday, with gusts of 15-20 mph locally near 30 mph through the Cascade gaps and downwind of the Blues Mountains. Another weak wave passes around Friday, with some light shower/sprinkle chances over far SE WA and the central and southern ID Panhandle. Another front pushes toward the region next weekend, with limited shower chances near the central ID Panhandle mountain Saturday and then around the the Cascades and in limited fashion near the Canadian border mountains, but otherwise limited chances elsewhere. Temperatures will be near normal much of this period, save for Saturday when temperatures push slightly above normal ahead of the weekend cold front. /Solveig && .AVIATION... 00Z TAFs: Showers over the aviation area producing very spotty and localized MVFR conditions with VFR prevailing as both surface based convection fills in ahead of an incoming cold front and other convection associated with disturbances moving up from the south linger. Some of the showers and thunderstorms have organized enough dynamics associated with them to allow mention during overnight and Monday morning hours however expecting the cold front exiting the region near 15-18Z Monday. /Pelatti && .PRELIMINARY POINT TEMPS/POPS... Spokane 55 71 49 74 49 75 / 20 30 0 0 0 0 Coeur d'Alene 55 69 51 73 50 74 / 20 50 0 0 0 10 Pullman 50 68 45 72 48 72 / 20 10 0 0 0 10 Lewiston 60 76 54 81 57 80 / 30 20 0 0 0 10 Colville 46 74 43 75 41 76 / 30 30 10 0 0 10 Sandpoint 51 66 48 74 46 73 / 30 70 30 0 0 10 Kellogg 55 64 51 72 53 73 / 40 60 10 0 0 20 Moses Lake 56 77 49 76 49 78 / 10 0 0 0 0 0 Wenatchee 58 76 54 78 54 77 / 10 0 0 0 0 0 Omak 58 79 55 79 53 78 / 10 10 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
Special Weather Statement
National Weather Service Spokane WA
514 PM PDT Sun Sep 3 2023
WAZ038-040100-
Okanogan Highlands WA-
514 PM PDT Sun Sep 3 2023
...A strong thunderstorm will impact portions of northern Ferry
County through 600 PM PDT...
At 513 PM PDT, trained weather spotters reported a strong
thunderstorm with Pea (0.25") to Small Marble (0.50") size hail 11
miles northwest of Sherman Pass, or 43 miles northeast of Omak,
moving east at 15 mph.
HAZARD...Winds in excess of 40 mph and half inch hail.
SOURCE...Trained weather spotters.
IMPACT...Gusty winds could knock down tree limbs and blow around
unsecured objects. Minor hail damage to outdoor objects is
possible.
Locations impacted include...
Sherman Pass, Republic, Curlew Lake State Park, and Malo.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4860 11879 4878 11881 4885 11830 4856 11824
TIME...MOT...LOC 0013Z 258DEG 15KT 4871 11868
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
CDPreliminary Local Storm Report
National Weather Service Spokane WA
520 PM PDT Sun Sep 3 2023
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0502 PM Hail 4 N Republic 48.71N 118.72W
09/03/2023 E0.25 inch Ferry WA Cocorahs
0.25 to 0.40 inch hail.
&&
CDSpecial Weather Statement
National Weather Service Spokane WA
542 PM PDT Sun Sep 3 2023
WAZ035-036-040100-
Spokane Area WA-Upper Columbia Basin WA-
542 PM PDT Sun Sep 3 2023
...Gusty showers will impact portions of east central Lincoln and
southwestern Spokane Counties through 600 PM PDT...
At 531 PM PDT, Doppler radar was tracking gusty showers 7 miles
southwest of Medical Lake, or 10 miles west of Cheney, moving east at
20 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...
Cheney, Airway Heights, Medical Lake, Fairchild AFB, Four Lakes, and
Waukon.
This includes the following highways...
Interstate 90 in Washington between mile markers 258 and 275.
U.S. Highway 2 in Washington between mile markers 277 and 280.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.
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 4744 11785 4751 11791 4768 11755 4744 11744
TIME...MOT...LOC 0031Z 251DEG 17KT 4749 11781
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
JCLEVSpecial Weather Statement
National Weather Service Spokane WA
555 PM PDT Sun Sep 3 2023
WAZ037-038-040130-
Northeast Mountains WA-Okanogan Highlands WA-
555 PM PDT Sun Sep 3 2023
...A strong thunderstorm will continue to impact portions of
northeastern Stevens and east central Ferry Counties through 630 PM
PDT...
At 554 PM PDT, Doppler radar was tracking a strong thunderstorm 11
miles northwest of Colville, or 62 miles northwest of Priest River,
moving east at 25 mph. This storm has a history of producing hail up
to 0.50 inches.
HAZARD...Winds in excess of 40 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...
Colville, Kettle Falls, Marcus, Davis Lake, Boyds, and Evans.
This includes U.S. Highway 395 in Washington between mile markers 227
and 252.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
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 4855 11825 4875 11827 4884 11770 4847 11765
TIME...MOT...LOC 0054Z 272DEG 21KT 4865 11808
MAX HAIL SIZE...0.50 IN
MAX WIND GUST...40 MPH
CDThe Spokane radar (KOTX), 105 km away, was scanning. The volume nearest the first event began at 01:36 UTC.
2 thunderstorm wind. Local standard time, as filed.
Thunderstorm damaged local power lines. Utility company estimated 300 customers lost power. Max gusts in the area were around 30 MPH.
Thunderstorm damage caused power outages via local power company. Utility Company estimated 14 customers lost power. Max gusts in the area were around 30 MPH.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2023Every state in 2023This day in weather historyWarnings in Washington, September 2023
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: 1142418, 1142419.