Baker City experienced more minor flooding as the Powder River came out of its banks from the 20th through the 22nd of the month.
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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.
Baker City experienced more minor flooding as the Powder River came out of its banks from the 20th through the 22nd of the month.
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 May 20, 8:11 AM PST, 3 hours 19 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BOISE ID 1011 AM MDT FRI MAY 20 2011 .DISCUSSION...A FEW MORE CLOUDS OVER THE FORECAST AREA TODAY AS A SPOKE OF ENERGY ROTATES WESTWARD FROM THE MAIN LOW OVER THE ROCKIES. IN ADDITION...CONVECTIVE INDICES ARE A LITTLE BETTER OVER THE BOISE AND WEST CENTRAL MOUNTAINS WITH LI/S ZERO TO MINUS ONE AND A SMALL AMOUNT OF CAPE. WE HAVE COVERED THIS POTENTIAL WITH 20 TO 30 PERCENT CHANCE POPS. OREGON ZONES ARE MORE STABLE AS THE UPPER RIDGE MOVES OVER THAT AREA. ALTHOUGH GUSTY AGAIN TODAY...IT IS NOT EXPECTED TO BE AS WINDY AS YESTERDAY AS THE PRESSURE GRADIENT RELAXES. TEMPERATURES ARE WARMING WITH HIGHS TODAY GENERALLY FROM 60 TO THE MID 70S. && .AVIATION...VFR. WIDELY SCATTERED AFTERNOON SHOWERS AND AND ISOLATED THUNDERSTORM OVER THE WEST CENTRAL AND BOISE MTNS AFTER 20Z. NORTHWEST WINDS TO 20 KTS AT THE SURFACE. VFR OVER THE WEEKEND. CONDITIONS ON SATURDAY SIMILAR TO TODAY. PERIODS OF LOWER CEILINGS AND PRECIPITATION SATURDAY NIGHT AND SUNDAY. && .PREV DISCUSSION...TODAY THROUGH SATURDAY...THE UPPER LOW CENTERED OVER COLORADO/WYOMING IS SENDING WRAP-AROUND MOISTURE INTO PORTIONS OF SOUTHWEST IDAHO...WITH ISOLATED LIGHT SHOWERS OCCURRING IN THE WESTERN MAGIC VALLEY THIS MORNING. THE MODELS CONTINUE TO SHOW SOME OF THIS MOISTURE PUSHING A BIT FURTHER WEST...INTO THE BOISE/WEST CENTRAL MTNS...BUT REMAINING NORTH AND EAST OF A BAKER-BOISE-TWIN FALLS LINE. WILL CONTINUE WITH LOW POPS IN THOSE AREAS THROUGH THIS EVENING. SHARP UPPER RIDGE JUST OFF TO OUR WEST WILL PROVIDE TEMPORARY DRYING AS IT TRAVERSES THE AREA LATE TONIGHT THROUGH EARLY SATURDAY. THE NEXT UPPER LEVEL TROUGH WILL PUSH THE RIDGE TO OUR EAST...AND OPEN THE DOOR FOR INCREASINGLY MOIST SW FLOW TO DEVELOP IN THE AFTERNOON. SHOWERS ARE EXPECTED IN HARNEY COUNTY WITH A CHANCE IN THE MTNS. KEPT IT DRY IN THE TREASURE VALLEY SINCE INITIALLY THE LOWER ATMOSPHERE LOOKS TO BE TOO DRY FOR PRECIP. TEMPERATURES WILL BE ABOUT THE SAME AS WHAT THEY WERE ON THURSDAY...WITH SLIGHT COOLING EXPECTED ON SATURDAY DUE TO INCREASED CLOUDS AND SHOWERS. LIGHTER WINDS ARE ANTICIPATED...EXCEPT IT WILL BE BREEZY AT TIMES TODAY IN THE TREASURE AND WESTERN MAGIC VALLEYS. LONG TERM...SATURDAY NIGHT THROUGH FRIDAY...SHORT WAVE RIDGE WILL BE FORCED TO THE EAST EARLY SUNDAY AS THE NEXT PACIFIC SYSTEM MOVES INTO THE INTERMOUNTAIN REGION. EXPECT SHOWERS /AND A CHANCE OF THUNDERSTORMS/ BOTH SUNDAY AND MONDAY...AS THE UPPER LEVEL LOW DIGS SOUTHEAST OVER OREGON. SHOWERS WILL PERSIST TUESDAY...BUT LIKELY DECREASE IN AREAL COVERAGE...AS THE UPPER LOW SLIDES SOUTHEAST TOWARD THE NEVADA-UTAH STATE LINE. AFTER A SHORT PERIOD OF RIDGING ON WEDNESDAY...PROGRESSIVE PATTERN WILL CONTINUE NEXT THURSDAY AND FRIDAY AS YET ANOTHER PACIFIC TROUGH MOVES INLAND. TEMPERATURES FORECAST TO BE AT OR BELOW NORMAL THROUGHOUT THE PERIOD. && .HYDROLOGY...FLOOD WARNINGS REMAIN IN EFFECT FOR THE SILVIES RIVER IN BURNS AND THE BRUNEAU RIVER NEAR HOT SPRINGS. THE FLOOD WARNING FOR THE SILVIES RIVER WILL BE CONTINUED INTO NEXT WEEK. FLOODING CONTINUES IN THE BURNS AREA WITH SURROUNDING FARM FIELDS ADJACENT TO HIGHWAYS 20 AND 78 FILLING UP WITH WATER AND WATER BEHIND A LEVEE CONTINUES TO RISE. SHOWERS ARE LIKELY OVER THE BASIN BY SATURDAY AFTERNOON...BUT UNTIL THEN IT IS EXPECTED TO REMAIN DRY. THE BRUNEAU RIVER HAS LEVELED OFF AT ABOUT A HALF A FOOT BELOW FLOOD STAGE. IT IS EXPECTED TO MOVE BACK ABOVE FLOOD STAGE LATE THIS WEEKEND OR EARLY NEXT WEEK. NO HEAVY PRECIPITATION IS FORECAST IN THE NEAR TERM BUT WARMER TEMPERATURES BOTH DURING THE DAY AND AT NIGHT WILL ADD ADDITIONAL SNOWMELT TO ALREADY RISING STREAMS AND RIVERS. && .BOI WATCHES/WARNINGS/ADVISORIES... ID...NONE. OR...NONE. && WEATHER.GOV/BOISE DISCUSSION...GS PREV DISCUSSION...BW LONG TERM....MT AVIATION.....DG HYDROLOGY....BW/GS
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE BOISE ID 521 AM MDT FRI MAY 20 2011 IDZ014-ORZ061-211130- UPPER TREASURE VALLEY-HARNEY COUNTY- 521 AM MDT FRI MAY 20 2011 /421 AM PDT FRI MAY 20 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST IDAHO AND SOUTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT FLOOD WARNINGS REMAIN IN EFFECT FOR THE BRUNEAU RIVER NEAR HOT SPRINGS AND THE SILVIES RIVER NEAR BURNS. PLEASE REFER TO THE INDIVIDUAL WARNINGS FOR ADDITIONAL INFORMATION. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED. IDZ011>013-015-016-028>030-033-ORZ062>064-211130- WEST CENTRAL MOUNTAINS-LOWER TREASURE VALLEY ID-BOISE MOUNTAINS- SOUTHWEST HIGHLANDS-WESTERN MAGIC VALLEY-CAMAS PRAIRIE- OWYHEE MOUNTAINS-SOUTHERN TWIN FALLS COUNTY-UPPER WEISER RIVER- BAKER COUNTY-MALHEUR COUNTY-LOWER TREASURE VALLEY OR- 521 AM MDT FRI MAY 20 2011 /421 AM PDT FRI MAY 20 2011/ THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL IDAHO...SOUTHWEST IDAHO...WEST CENTRAL IDAHO...NORTHEAST OREGON AND SOUTHEAST OREGON. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED.
The national radar mosaic for the moment the first event began.
1 flood. Local standard time, as filed.
River gauge observations and reports from local officials indicated that minor flooding was occuring in and around Baker City.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oregon in 2011Every state in 2011This day in weather historyWarnings in Oregon, May 2011
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: 320326.