38 of rain measured in 2 hours at a site close to the debris flow reports. A flash flood warning was issued due to high intensity rainfall occurring in areas in and below the Crescent Mountain Fire burn scar.
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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.
Scattered thunderstorms produced heavy rain across northern Washington, with 0.38 of rain measured in 2 hours at a site close to the debris flow reports. A flash flood warning was issued due to high intensity rainfall occurring in areas in and below the Crescent Mountain Fire burn scar.
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 Jul 8, 2:36 PM PST, 4 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 336 PM PDT Thu Jul 8 2021 .SYNOPSIS... Another weather disturbance will bring thunderstorms chances along the Canadian border late Thursday afternoon and evening. It will also bring nocturnal thunderstorms chances for extreme southeastern Washington and into the Central Panhandle overnight. Other than these small precipitation chances, the region will remain dry into next week, with periods of breezy winds at times. Temperatures will climb back into the upper 90s by Saturday. && .DISCUSSION... Tonight through Friday night: Low pressure spiraling off the Pacific coast will be moving into the region this evening through Friday morning. Isolated to scattered showers and thunderstorms will be possible over the northern mountain zones, from Okanogan county to northern Boundary county. Overall the threat will be higher closer to Canadian border. Chances will wane into the overnight. They could produce some small hail, brief heavy rain and gusty winds but these instances should be limited. Another risk for thunderstorms, largely of the dry variety, will found around the southeast side of the low over the Blue Mountains through Camas Prairie into lower Shoshone county. Models have been somewhat consistent in depicting this risk, with some elevated MUCAPES between 100-300 J/kg and decent DIV-Q with the trough. Yet moisture is very much lacking and these would be higher based, hence the tendency to call them dry thunderstorms. Overall the PoPs are rather low (10-15%), but they could produce isolated lightning strikes and some gusty winds. Going into Friday a limited risk for shower/t-storms will wane over the Idaho Panhandle early, leaving dry and mostly clear conditions save for potential smoke/haze coming from the area wildfires. The main impact from smoke/haze tonight through Friday is expected to remain over far SE WA and the lower Panhandle, with the higher concentration near and east of the Blues into the Camas Prairie. However winds start to turn more easterly going into Friday night, leading to the potential for smoke expanding further northwestward, possibly are far north as the Spokane/Whitman county border or so. We will have to keep an eye on air quality as we continue to move forward. Lastly winds will be breezy at times, with the main push coming through the Cascades this evening and expanding east over the western Columbia Basin and portions of the Blues and Palouse overnight into Friday. Gusts around 15-25 mph will be possible. /Cote' Saturday through Thursday: Big picture-wise, upper level zonal flow with some shallow short waves, not all of which will bring precipitation. Saturday and Sunday are both expected to be breezy, especially Sunday with a stronger pressure gradient between western WA and eastern WA. Strongest winds are expected where we see gap winds, particularly in the Kittitas Valley. With the arrival of another shortwave, Wednesday and Thursday bring isolated shower and thunderstorm chances and a slight cool down. Other than that, during the period, temperatures will generally reach into the 90s with low 100s possible in the Moses Lake area and Okanogan and LC Valleys. Thursday temperatures possibly cool to the upper 80s but likely remain in the 90s for the warmer spots. Breezy, dry afternoons (particularly Saturday and Sunday) will increase fire danger, though there is somewhat of a concern for lightning hence fire starts Wednesday and Thursday. RC && .AVIATION... 00Z TAFS: Some shower and thunderstorm chances this evening and overnight close to the Canadian border and potentially over SE WA and lower ID. LWS might see some of this action between 03-05Z; however confidence is low. Expect winds in general to be light, with the exception of KEAT with gusts up to 25kts possible. Any showers that pass by KLWS may also produce brief gusts. Lastly, smoke from area wildfires may bring some haze near KLWS. RC && .PRELIMINARY POINT TEMPS/POPS... Spokane 58 92 61 97 62 95 / 10 0 0 0 0 0 Coeur d'Alene 57 91 58 97 60 94 / 10 0 0 0 0 0 Pullman 53 89 56 94 58 91 / 10 0 0 0 0 0 Lewiston 65 98 65 105 68 102 / 10 0 0 0 0 0 Colville 53 94 56 97 55 96 / 10 10 0 0 0 0 Sandpoint 53 88 52 93 53 93 / 10 10 0 0 0 0 Kellogg 61 87 63 94 65 92 / 10 0 0 0 0 0 Moses Lake 59 95 60 101 60 98 / 10 0 0 0 0 0 Wenatchee 63 96 68 99 65 95 / 10 0 0 0 0 0 Omak 63 98 64 102 64 99 / 10 0 0 0 0 0 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
Hazardous Weather Outlook National Weather Service Spokane WA 447 AM PDT Thu Jul 8 2021 IDZ001>004-026-027-WAZ031>038-041>044-091200- Northern Panhandle-Coeur d'Alene Area-Idaho Palouse- Central Panhandle Mountains-Lewiston Area- Lewis and Southern Nez Perce Counties-Northeast Blue Mountains- Lower Garfield and Asotin Counties-Washington Palouse- Moses Lake Area-Upper Columbia Basin-Spokane Area- Northeast Mountains-Okanogan Highlands-Wenatchee Area- East Slopes Northern Cascades-Okanogan Valley-Waterville Plateau- 447 AM PDT Thu Jul 8 2021 This Hazardous Weather Outlook is for portions of North Idaho... North Central Idaho...Central Washington...East Central Washington...North Central Washington...Northeast Washington and Southeast Washington. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY No hazardous weather is expected at this time.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SPOKANE WA
716 PM PDT THU JUL 8 2021
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0658 PM DEBRIS FLOW 11 W MAZAMA 48.56N 120.63W
07/08/2021 OKANOGAN WA LAW ENFORCEMENT
ROCK SLIDE BLOCKING BOTH LANES OF SR 20 MP
166 (2 MILES WEST OF CUTTHROAT CREEK ROAD -
30 MILES WEST OF WINTHROP IN OKANOGAN
COUNTY). HEAVY RAIN IN THE AREA AND WATER
OVER THE ROADWAY.
&&The national radar mosaic for the moment the first event began.
2 debris flow. Local standard time, as filed.
A rock slide blocked both lanes of State Route 20 near mile post 166, two miles west of Cutthroat Creek Road. Heavy rain in the area lead to the slide and water over the roadway.
The US Forest Service reported a debris flow that blocked the NF-4440 Road, one mile east of the Gilbert Trailhead. The flow was approximately four feet deep and stranded two cars overnight. Time is estimated based on radar.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2021Every state in 2021This day in weather historyWarnings in Washington, July 2021
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: 972692, 972707.