Increased snow melt caused minor flooding along portions of the Imnaha river on May 5th.
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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.
Increased snow melt caused minor flooding along portions of the Imnaha river on May 5th.
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 May 5, 7:52 PM PST, 38 minutes earlier.
Area Forecast Discussion National Weather Service Pendleton OR 852 PM PDT Fri May 5 2017 .SHORT TERM...Tonight and Saturday...An upper level trough is stalling along the coast as it undergoes a split. This is placing the forecast area under a southerly flow with a cold front near the Idaho border. There continues to be some thunderstorm along and ahead of the cold front. Some of this is still impacting Wallowa county. Behind the front are cooler breezy conditions and some showers. The front will slowly move into Idaho overnight with the bulk of the convective precipitation but will continue to see some lingering precipitation over the far eastern mountains through Saturday. && .PREV DISCUSSION... /issued 430 PM PDT Fri May 5 2017/ SHORT TERM...Tonight through Monday. Upper level trough moving into the Pacific northwest. The cold front has been slowly moving across the forecast area today. Best chance for showers and thunderstorms will be this afternoon and evening along and ahead of the frontal boundary where airmass is still unstable. Mainly over the eastern third of the forecast area from the John Day highlands and Blues to the Idaho border. Behind the front appears that scattered showers are possible with the colder air aloft. Westerly winds are also increasing in this region with partial clearing of the cloud cover. Locally breezy to windy conditions expected. The upper level trough will be nearly stationary over the area this weekend with partly to mostly cloudy skies and scattered showers. The northeast Oregon mountains will have a better chance for rain as they remain in the southerly flow aloft ahead of the trough axis. Breezy west winds will continue Saturday. Temperatures much cooler this weekend compared to a few days ago. Building ridge with a drier westerly flow Monday with partly cloudy skies and warmer temperatures. 94 LONG TERM...Monday night through Friday. No major weather concerns are anticipated for Monday night through Wednesday morning when the forecast area will be under a shortwave ridge. The ridge will shift eastward late Wednesday and the flow will back to the southwest... allowing showers to return to the area. Precipitation chances will increase from Wednesday night through Friday as a deep upper level trough develops offshore and sends surges of moisture and embedded waves east of the Cascades. Wednesday will be the warmest day of the week with temperatures in the 70s to lower 80s. Otherwise...daytime temperatures will primarily be in the mid 60s to mid 70s. No wind concerns are expected but it will be locally breezy on Wednesday. Wister AVIATION...00Z TAFs. Showers and scattered thunderstorms have developed over the northern Blue Mountains...about 15-25 miles east of KALW and KPDT. Some of the towering cumulus along the Blue Mtn Foothills could develop into cumulonimbus. VFR conditions will prevail in all TAF sites with CIGS between 6K-10K ft AGL. Most showers or thunderstorms this evening and Saturday afternoon will likely be confined to the Cascades or the Blue Mtns. Westerly winds at 10-18 knots gusting to around 25 knots will subside overnight but will increase to similar winds speeds on Saturday. Wister && .PRELIMINARY POINT TEMPS/POPS... PDT 44 59 36 62 / 30 20 10 10 ALW 48 61 39 65 / 30 20 10 10 PSC 46 66 38 70 / 40 10 10 10 YKM 41 65 36 70 / 30 10 10 0 HRI 45 65 38 68 / 40 10 10 10 ELN 40 60 35 65 / 30 10 10 0 RDM 35 54 26 61 / 20 10 10 10 LGD 44 53 36 59 / 60 50 30 20 GCD 42 53 33 59 / 50 30 20 20 DLS 45 65 39 70 / 30 10 10 10 && .PDT WATCHES/WARNINGS/ADVISORIES... OR...None. WA...None. && 91/91/91
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
The Imnaha River at Imnaha had minor flooding early on May 6th, due to snow melt. The river crested at the flood stage of 5.5 feet early on May 6th.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2017Every state in 2017This day in weather historyWarnings in Oregon, May 2017
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: 701607.