Two to three inches of rain fell along the west slopes of the Blue Mountains from February 1st through 4th. The increased runoff caused high water levels and minor flooding along the Umatilla and Walla Walla Rivers.
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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 PDT wrote it up.
Two to three inches of rain fell along the west slopes of the Blue Mountains from February 1st through 4th. The increased runoff caused high water levels and minor flooding along the Umatilla and Walla Walla Rivers.
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 Pendleton, OR wrote its last area forecast discussion before the first event at Feb 5, 2:35 PM PST, 25 minutes earlier.
Area Forecast Discussion National Weather Service Pendleton OR 235 PM PST Mon Feb 5 2018 .SHORT TERM...Today through Thursday. Our area remains in a nw flow aloft allowing for weak disturbances to brush the northern portions of the region with some showers over the area mountains in an upslope flow. The greatest chances remain along the blue and wallowa mountains and this pattern persist into Tuesday. Pressure gradients remain tight and breezy to windy conditions can be expected at times this evening before lessening into tomorrow. As a high pressure system over the epac strengthens and ridges into our region...this will influence the areas weather with drier conditions on Wednesday and into Thursday with a warming trend expected along with rising snow levels above 5k feet. Afternoon high temps are expected to remain above normal and climb into the 60s on Thursday. .LONG TERM...Thursday night through Monday...Models in poor agreement through the period. GFS shows a strong disturbance dropping down from BC Friday and another disturbance impacting the area Sunday night. ECMWF shows an upper level ridge over the eastern Pacific resulting in continued NW upper level flow over the Pacific Northwest. This pattern continues until Monday when it shows a system dropping out of BC. At this time, will lean towards ECMWF as it has been the more common pattern this Winter. A few weak disturbances moving through the northwest flow will provide a slight chance of precipitation in favored northwest facing slopes and along the crest of the cascades at times. Temperatures are expected to fall to near normal values by the weekend as thicknesses slowly fall across the region. Earle && .AVIATION...00Z TAFs...VFR conditions will continue the next 24 hours. Mid to high level clouds will decrease overnight. Winds will be 10-20 kts with higher gusts, except 20-25 kts with higher gusts at KDLS. Winds will decrease to 10 kts or less overnight and remain there through Tuesday afternoon. Earle && .PRELIMINARY POINT TEMPS/POPS... PDT 38 52 40 58 / 20 10 10 10 ALW 40 54 41 59 / 20 10 10 10 PSC 38 55 40 57 / 10 10 10 10 YKM 35 54 37 58 / 0 10 10 10 HRI 39 55 40 58 / 10 10 10 10 ELN 36 49 39 54 / 10 10 10 10 RDM 28 51 31 61 / 0 10 10 10 LGD 37 48 36 55 / 20 10 10 10 GCD 35 48 36 57 / 10 10 10 10 DLS 41 54 41 59 / 0 10 10 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && 97/81/81
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE PENDLETON OR
1232 PM PST MON FEB 05 2018
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0350 AM NON-TSTM WND DMG 4 W YAKIMA 46.60N 120.62W
02/05/2018 YAKIMA WA LAW ENFORCEMENT
REPORT OF DOWNED TREE AND A POWER OUTAGE DUE TO STRONG
WINDS ALONG SUMMIT VIEW EXT RD
&&
JASThe national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Walla Walla river near Touchet - Flood Stage 13 feet. River rose to flood stage at 1500 PST, cresting at 13.0 feet at 1530 PST, then went below flood stage after 1600 PST. Only brief minor flooding.
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, February 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: 734151.