Snow melt and rain created saturated soil conditions which lead to a road washout near Curlew in Ferry County. The road bed was undermined by the flood water causing the washout and collapse of a 20 foot section of the highway.
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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.
Snow melt and rain created saturated soil conditions which lead to a road washout near Curlew in Ferry County. The road bed was undermined by the flood water causing the washout and collapse of a 20 foot section of the highway. The road is a major thoroughfare through the region and was re-opened after 2 days of repair work.
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 Apr 28, 10:16 AM PST, 2 hours 14 minutes earlier.
Area Forecast Discussion National Weather Service Spokane WA 1116 AM PDT Sat Apr 28 2018 .SYNOPSIS... Today and tomorrow will be much cooler with occasional showers. The cool and unsettled weather will ease by midweek as a ridge rebuilds over the Inland Northwest with warmer and drier weather. && .DISCUSSION... Morning update sent to adjust pops/showers for today. The initial band of showers wrapping around the eastern and northern periphery of the incoming low is clearing out a bit slower from N Idaho and N WA then expected. Incoming model guidance is suggesting another shortwave tracking along this band of moisture and renewing shower chances this afternoon and evening. This was expected but not as far west into Ern WA as previous runs. Sun breaks over the southwestern Basin will also promote afternoon instability and potential for convective showers across Grant and Douglas County before drifting into Chelan and Okanogan. May have a weak t-storm in this area as well but confidence was too low to add at this point. /sb && .AVIATION... 18Z TAFS: MVFR cigs will slowly improve through 20z as precipitation begins to lift to the NE. Another batch of showers will be possible along this band of moisture stretching from KLWS/KPUW toward KGEG/KCOE later this afternoon. May have a few weak thunderstorms vcnty KLWS but confidence too low to include in TAF. Afternoon heating will promote convective showers vcnty of KEAT/KMWH 20-02Z. Cannot rule out a stray lightning strike but once again, confidence too low to include in TAF. Showers will linger near ID/MT border overnight, otherwise terminals will dry out. Did introduce some stratus for KGEG-KCOE with favorable wind pattern and cool, moist boundary layer. /sb && .PRELIMINARY POINT TEMPS/POPS... Spokane 59 42 58 41 57 41 / 50 10 10 20 30 10 Coeur d'Alene 59 42 57 39 55 39 / 40 20 10 30 40 20 Pullman 56 43 56 40 54 40 / 30 40 10 20 20 10 Lewiston 63 48 62 43 60 43 / 40 50 20 20 20 10 Colville 60 42 60 41 61 41 / 50 20 40 30 30 10 Sandpoint 57 41 55 39 53 39 / 40 30 30 50 40 20 Kellogg 56 39 55 38 52 36 / 30 40 30 30 40 30 Moses Lake 65 42 65 43 65 41 / 20 10 0 10 10 10 Wenatchee 63 43 63 42 63 42 / 20 0 10 10 10 10 Omak 63 44 62 42 64 43 / 50 20 20 20 20 10 && .OTX WATCHES/WARNINGS/ADVISORIES... ID...None. WA...None. &&
Hazardous Weather Outlook National Weather Service Spokane WA 355 AM PDT Sat Apr 28 2018 IDZ001-004-WAZ037-038-042-043-291300- Northern Panhandle-Central Panhandle Mountains- Northeast Mountains-Okanogan Highlands- East Slopes Northern Cascades-Okanogan Valley- 355 AM PDT Sat Apr 28 2018 This Hazardous Weather Outlook is for portions of North Idaho... North Central Washington and Northeast Washington. .DAY ONE...TODAY AND TONIGHT No hazardous weather is expected at this time. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY Significant rises on rivers and streams are expected from the East slopes of the Cascades through Northern Washington and into the Idaho Panhandle this weekend into next week. Recent warm temperatures have begun to melt the mountain snow pack. Periods of rain this weekend will contribute to the rising rivers. IDZ002-003-026-027-WAZ031>036-041-044-291300- Coeur d'Alene Area-Idaho Palouse-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-Wenatchee Area- Waterville Plateau- 355 AM PDT Sat Apr 28 2018 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...SUNDAY THROUGH FRIDAY No hazardous weather is expected at this time.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
A road washout cut out and collapsed a 20 foot section of Highway 21 just north of Curlew.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Washington in 2018Every state in 2018This day in weather historyWarnings in Washington, April 2018
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: 750959.