Rainfall and snow melt combined to increase the flow on the Snake River to minor flood stage.
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The episode as NWS BOI wrote it up.
Rainfall and snow melt combined to increase the flow on the Snake River to minor flood stage.
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 Boise, ID wrote its last area forecast discussion before the first event at Mar 17, 7:35 PM MST, 4 hours 25 minutes earlier.
Area Forecast Discussion National Weather Service Boise ID 835 PM MDT Fri Mar 17 2017 .DISCUSSION...An impressive plume of mid and upper-level moisture is moving ashore in the Pacific Northwest ahead of an approaching trough of low pressure. Radars and surface observations across Washington and Oregon indicate clouds and rainfall. Overnight and into this weekend this area of moisture is expected to move into southeast Oregon and southwest Idaho. See the previous discussion from earlier today for further details. No updates planned this evening. && .AVIATION...Mostly VFR. Showers starting to push into SE Oregon and portions of the West Central Mountains near KMYL. These showers will continue to progress eastward tonight into Saturday. Valley locations will see heaviest showers Saturday afternoon into the evening. Surface winds, variable 10-15 kts. Winds aloft to 10k feet MSL, southwest 25-50 kts. Weekend Outlook...Lingering showers through Sunday evening mostly south of a KBNO-KONO-KMYL line. Snow levels stay above 5500 feet MSL through Sunday. && .PREV DISCUSSION... SHORT TERM...Tonight through Sunday...Widespread dry conditions noted this afternoon under the lingering influence of a departing ridge. The ridge axis continues to move eastward, with showers beginning to move into eastern Oregon, and central Idaho this afternoon and evening. Digging southwest flow will aid in the further development of showers this evening, as well as increasing winds with an increased pressure gradient expected. As the trough moves eastward, shower activity will spread to include much of the area. By Saturday afternoon, this pattern will introduce some instability, and may result in a few thunderstorms across south- central Idaho. Expect slightly cooler temperatures through the weekend. Shower coverage across the area will remain through Sunday, with most areas anticipated to see at least some shower activity. Snow levels will be around 8000 ft on Sunday, with a few higher peaks looking for some light snowfall accumulation with this system. This system, especially with its potential for rain shower activity will cause streams and rivers, both small and mainstream, to increase through the weekend. Hydrologic concerns remain in place, as some areas look favorable to see some minor flooding through the weekend. LONG TERM...Sunday night through Friday...Active wet pattern will continue through the extended period as an upper level trough moves through the region. Remains of a cold front linger over the forecast area Sunday night through Monday keeping the threat for showers. A shortwave trough passage Tuesday morning will lift the front northward and out of the area. Widespread precipitation begins Tuesday afternoon as a cold front move across the Pacific Northwest. Showers will continue through Wednesday with passage of the upper level trough. A brief dry period on Thursday with an upper level ridge over the region will be shortly lived as another upper level trough reaches the west coast late Friday. Temperatures are expected to remain above normal through at least Wednesday, and likewise, snow levels will stay 6000 ft and higher. Thursday and Friday look to be cooler and more near normal. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise www.facebook.com/NWSBoise www.twitter.com/NWSBoise DISCUSSION...MC AVIATION.....JC PREV SHORT TERM...KB PREV LONG TERM....JDS/DD
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Flooding occurred along the Snake River around the Weiser, Idaho area and surrounding fields and roads.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2017Every state in 2017This day in weather historyWarnings in Idaho, March 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: 697169.