Flooding caused by rapid snowmelt in March continued through mid-April. 2 feet, on March 29th.
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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 BOI wrote it up.
Flooding caused by rapid snowmelt in March continued through mid-April. The Silvies river rose to 14.76 feet, about half a foot under the record of 15.2 feet, on March 29th. The water levels began to decrease, although the area remained inundated. Another warm period in mid-April allowed for the river level to begin rising again. Reaching a secondary peak of 12.58 feet on April 11th. Water dropped below flood stage on April 15th. Flood impacts were observed through mid-late April.
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 31, 6:59 PM PST, 5 hours 1 minute earlier.
Area Forecast Discussion National Weather Service Boise ID 859 PM MDT Mon Mar 31 2025 .DISCUSSION...An upper level trough remains over the Pacific NW with several shortwaves embedded in the flow. One shortwave over eastern OR is forecast to slowly move eastward tonight into southwest ID on Tuesday morning, bringing scattered showers, some of which may produce a quick inch of snow underneath the core. Models have trended upward with QPF and POPs so have updated the forecast to reflect this. Snow levels fall to the valley floors by Tuesday morning. Cold air aloft remains over the area, with H500 temperatures around -30C through Tuesday, which is favorable for shower development to continue. Daytime heating on Tuesday will strengthen showers during the afternoon, especially over the higher terrain, where showers may produce thunder and graupel. Rest of the forecast on track with cool and unsettled conditions through Friday, before warming over the weekend to around 10 degrees above normal over the weekend. && .AVIATION...Mainly VFR. Scattered rain and snow showers will continue overnight. Showers decreasing after 01/12Z, with additional shower and isolated thunderstorm development mainly over the higher terrain during the day Tuesday. Snow levels 2500-3500 ft MSL. Periods of MVFR conditions in rain with MVFR/IFR in snow. Mountains obscured at times. Surface winds: SW-NW 5-15 kt. Gusts to 30 kt in the Magic Valley on Tuesday. Winds aloft at 10kft: W-NW 15-30 kt. KBOI...Mainly VFR. A 50% chance of showers overnight, ending by 01/15Z. Rain showers may mix with or change to snow overnight. MVFR conditions in rain, although IFR is possible if precip changes to snow. Surface winds: NW 5-10 kt. && .HYDROLOGY...Most river levels continue to gradually fall due to the cooler temperatures. This does not include increased flows downstream from controlled reservoir releases, such as the Owyhee River below Owyhee Dam. Flood Warnings remain in effect for the Silvies River near Burns and the Malheur River near Vale. && .PREV DISCUSSION... SHORT TERM...Tonight through Wednesday night...First round of showers and thunderstorms that rolled through SW Idaho produced wind gusts to 50 mph, and lots of small hail which covered the ground on some areas, including the Boise metro. That area of convection will move out of the area later this afternoon as a new area of convection develops in SE Oregon. The hi-res models continue to indicate the potential for small hail and gusty winds with the heavier showers and thunderstorms as they propagate into SW Idaho late this afternoon and evening. The higher elevations could see brief bursts of moderate to heavy snowfall that could drop a quick inch or two of snowfall. The trend overall will be a decrease in activity tonight, but increase again on Tuesday due instability from daytime heating/cold air aloft. There is also a slight chance of afternoon thunderstorms, once again accompanied by gusty winds, small hail/graupel, and brief precip (including snow above 3500 feet). The trough lingers on Wednesday for more showers, mainly over the higher elevations, but the probability of precipitation is lower (generally 15-40 percent). There is also a slight chance of afternoon thunderstorms in s-central Idaho. Temperatures remain 5 to 10 degrees below normal each day. LONG TERM...Thursday through Monday...The final piece of the upper level trough axis will pass by Thursday as a strong ridge moves in from the west. After a 20-60% chance of showers Thu (highest in the mountains), they will end late Thursday night. Snow levels will range from 3000-4000 ft MSL Thu into Thu night. Dry weather will be with us Friday through Monday as the ridge moves closer through the weekend, and then off to the east Monday. Temperatures will start out chilly - around 5 degrees below normal Thursday, but quickly warm up. We should be near normal Friday, a few degrees above normal Saturday, and 10-15 degrees above normal Sunday and Monday. Models are in excellent agreement on this pattern, so this is a high-confidence forecast. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...None. OR...None. && www.weather.gov/Boise Interact with us via social media: www.facebook.com/NWSBoise www.x.com/NWSBoise DISCUSSION...KA AVIATION.....ST SHORT TERM...BW LONG TERM....SP HYDROLOGY....BW
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
Hundreds of homes were impacted by flood waters, many with major damage and some were uninhabitable. Numerous residents were evacuated during the height of the flooding with some sheltering in hotels and Red Cross mass care facilities. Extensive damage to sewer system.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2025Every state in 2025This day in weather historyWarnings in Oregon, April 2025
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: 1249498.