Moist upslope flow into the Blue Mountains produced heavy rain with rainfall rates of up to one inch per hour and storm total accumulations between one and three inches. Localized flooding was reported near the town of Heppner where water inside a residence forced an evacuation.
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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.
Moist upslope flow into the Blue Mountains produced heavy rain with rainfall rates of up to one inch per hour and storm total accumulations between one and three inches. Localized flooding was reported near the town of Heppner where water inside a residence forced an evacuation.
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 Oct 9, 7:35 AM PST, 25 minutes earlier.
Area Forecast Discussion
National Weather Service Pendleton OR
835 AM PDT Tue Oct 9 2018
.UPDATE...Widespread rain this morning is winding down in WA and
north central OR. However upslope winds into the Foothills of the
Blues and Blue Mountains will keep moderate rain in those areas
today. An upper level low near Moses Lake will move rapidly south
over WA and OR today. Precipitation will clear behind the low
this afternoon. Coonfield
&&
.HYDROLOGY...Upslope winds into the Foothills of the Blues and
Blue Mountains will keep moderate rain in those areas. The
combination of heavy rain earlier and and continued potential for
heavy rain showers at times may cause flash flooding and
mudslides. A Flash Flood Watch has been issued until 1 PM.
&&
.PREV DISCUSSION... /issued 251 AM PDT Tue Oct 9 2018/
SHORT TERM...Today through Thursday. A low pressure system over
Washington will move across ne Oregon today and continue to bring
clouds and showers to mostly the eastern half of the cwa.
Elsewhere showers will persist especially along the WA/OR cascades.
The low pressure tracks quickly into Idaho this evening and the
showers lessen but persist mainly over the blue/wallowas tonight
and wednesday. Snow levels will decrease under 5k feet Wednesday
and some minor snow accumulation is possible across the higher
elevations. Meanwhile a ridge of high pressure builds into the two
state area thursday with some patchy morning fog and afternoon
temperatures ought to rebound to near normal.
LONG TERM...Thursday night through Monday. Dry conditions
are expected through the extended period as high pressure builds
over the area. A fast moving weather system will clip northeast
Washington on Friday and bring some stronger winds to eastern
Washington and northeast Oregon Friday night through early Saturday.
Temperatures will be near seasonal levels through the weekend and
slightly cooler early next week.
AVIATION...12Z TAFs...MVFR/IFR cigs and visibilities will be
possible at all TAF sites through early afternoon with rain showers
except KRDM and KBDN which will remain at VFR levels with VCSH 14Z-
22Z. The low pressure system will be exiting the area by late
afternoon with some wrap around moisture over the mountains as most
locations see VFR conditions with decreasing clouds through the
evening. Winds will be to 10 to 20 kt winds decreasing after 20z to
below 10 kts
&&
.PRELIMINARY POINT TEMPS/POPS...
PDT 55 37 57 34 / 90 10 10 10
ALW 57 39 59 38 / 90 10 10 10
PSC 61 40 63 39 / 70 10 10 10
YKM 62 39 62 35 / 60 10 10 0
HRI 61 39 62 37 / 80 10 10 10
ELN 60 38 62 35 / 60 10 10 0
RDM 54 34 57 28 / 30 10 10 0
LGD 53 38 55 35 / 90 20 20 10
GCD 53 36 55 32 / 70 20 20 10
DLS 63 44 65 42 / 40 10 10 0
&&
.PDT WATCHES/WARNINGS/ADVISORIES...
OR...Flash Flood Watch until 1 PM PDT this afternoon for ORZ502-503-
507-508.
WA...Flash Flood Watch until 1 PM PDT this afternoon for WAZ029-030.
&&
76/94/94The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Two feet of water inside a residence due to heavy rain forced four adults and a child to leave their house on the 54200 Block of Highway 74 in Heppner.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2018Every state in 2018This day in weather historyWarnings in Oregon, October 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: 786086.