Several reports of severe thunderstorms reported throughout southeast Idaho.
Every event with a place to put it. Tap one for its entry below.
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 PIH wrote it up.
Several reports of severe thunderstorms reported throughout southeast Idaho.
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 Pocatello, ID wrote its last area forecast discussion before the first event at Apr 22, 12:51 PM MST, 5 hours 44 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 151 PM MDT WED APR 22 2009 .SHORT TERM...TONIGHT THROUGH SATURDAY. THUNDERSTORMS JUST DEVELOPING AT THIS HOUR WITH THREAT CONTINUING LATE TON. 500MB FLOW TOPS OUT BELOW 50KT AND THUS DO NOT BELIEVE SEVERE WIND LEVEL WILL BE REACHED. 500MB TROUGH LINGERS OVER THE GEM STATE TOMORROW WITH EVEN MORE INSTABILITY AND STRONGER WIND OVER SOUTHEAST IDAHO. EXPECT COLDER AFTERNOON HIGHS WITH THE INCREASED CLOUD COVER...BUT TREND CONTINUES STRONGLY WITH ABUNDANT COLD AIR BEHIND THE FRONT WHICH PASSES THROUGH THU NIGHT. AS SKIES CLEAR SOMEWHAT...OVERNIGHT LOWS DROP STRONGLY WITH ALPINE BASIN LOWS IN THE CENTRAL IDAHO MOUNTAINS BACK IN THE TEENS. WIND WILL BE STRONG IN THE PREFRONT ZONE ON THU AND THU EVE. TEMPERATURES ONLY LOOK COLD LONG ENOUGH IN ZONE 19 FOR A LOW CONFIDENCE WINTER STORM WARNING LEVEL ACCUMULATION...AND DOESNT START ACCUMULATING UNTIL THU NIGHT. SO WILL LEAVE ALONE FOR NOW. .LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY. GFS KEEPS A TROF IN THE REGION THEN SHIFTS IT WEST LATE IN THE PERIOD. TEMPERATURES SHOULD REMAIN BELOW NORMAL IN THIS PATTERN. THE GFS ACTUALLY DRIES IT OUT A BIT TUESDAY AND WEDNESDAY AS IT IS MORE PROGRESSIVE WITH THE TROF AND HAS NORTHERLY FLOW ALOFT AND WITH THE DRYING BY TUESDAY. EUROPEAN KEEPS THE TROF AND THEN CLOSED UPPER LOW WEST OF REGION THROUGH WEDNESDAY WITH MORE SOUTHWESTERLY FLOW AND WETTER CONDITIONS. AS HAS BEEN TREND RECENTLY...THE MODELS HAVE LARGE DISAGREEMENT IN LATER PERIODS. WITH THE UNCERTAINTY DID NOT ALTER GRIDS ALL THAT MUCH AND KEPT IN NEAR CLIMATOLOGICAL PRECIPITATION CHANCES. SHOULD AT LEAST BY SHOWERY WITH COLD AIR ALOFT SUNDAY AND MONDAY. LESS CONFIDENT IN LATER PERIODS. GK && .AVIATION...EXPECT ISOLATED THUNDERSTORMS TO DEVELOP LATE THIS AFTERNOON AS INSTABILITY INCREASES. EXPECT MAINLY TO OCCUR IN MOUNTAINS AND HAVE VICINITY THUNDERSTORMS AT HAILEY. EXPECT VFR CONDITIONS TO PREDOMINATE THROUGH THURSDAY. EXPECT MORE WIDESPREAD SHOWERS AND THUNDERSTORMS THURSDAY AS COLD FRONT APPROACHES. EXPECT WINDS IN THE 15 TO 25 KNOT RANGE AT IDAHO FALLS AND POCATELLO THROUGH EARLY EVENING TONIGHT AND 15 TO 30 KNOTS ON THURSDAY AT BYI...PIH AND IDA. GK && .PIH WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 340 AM MDT WED APR 22 2009 IDZ017>025-031-032-230945- EASTERN MAGIC VALLEY-SAWTOOTH MOUNTAINS-UPPER SNAKE HIGHLANDS- UPPER SNAKE RIVER PLAIN-LOWER SNAKE RIVER PLAIN- SOUTH CENTRAL HIGHLANDS-CARIBOU HIGHLANDS- CACHE VALLEY/IDAHO PORTION-WASATCH MOUNTAINS/IDAHO PORTION- BIG AND LITTLE WOOD RIVER REGION-LOST RIVER/PAHSIMEROI- 340 AM MDT WED APR 22 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED THROUGH TONIGHT. THE BEST CHANCE WILL BE IN THE HIGHER ELEVATIONS. LITTLE TO NO PRECIPITATION IS ANTICIPATED...WITH GUSTY DOWNBURST WINDS POSSIBLE WITH THE STRONGER SHOWERS/STORMS. THE THREAT OF SMALL HAIL IS LOW AT THIS POINT IN TIME. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY RAIN AND MOUNTAIN SNOW SHOWERS WILL INCREASE HEADING INTO THE WEEKEND. THERE IS THREAT OF THUNDERSTORMS AGAIN ON THURSDAY INTO THE EVENING HOURS FOR AREAS EAST OF THE CENTRAL MOUNTAINS. THERE IS A THREAT FOR MORE ORGANIZED AND STRONGER STORMS THURSDAY. EXPECT LOCALLY HEAVY DOWNPOURS AND SMALL HAIL WITH SOME OF THIS ACTIVITY. WHERE THE LOWER LEVELS OF THE ATMOSPHERE REMAIN DRIER, GUSTY DOWNBURST WINDS ARE POSSIBLE. AT THIS TIME...THE THREAT OF SEVERE WEATHER REMAINS LOW. COLDER AIR WILL MOVE BACK INTO EASTERN IDAHO WITH HIGHS DROPPING BACK INTO THE 40S AND 50S FOR THE LOWER ELEVATIONS WITH SOME 20S AND 30S RETURNING TO THE MOUNTAINS. WITH AN ACTIVE WEATHER PATTERN TRYING TO DEVELOP...THE THREAT OF PRECIPITATION WILL CONTINUE INTO EARLY NEXT WEEK. SNOWMELT WILL CONTINUE OVER THE NEXT 24 TO 48 HOURS...BEFORE COLDER TEMPERATURES WILL LIKELY SLOW DOWN THE PROCESS. HOWEVER...ANY RAIN OR SNOW THAT FALLS COULD ADD TO ALREADY SLOWLY RISING RIVERS AND STREAMS. CURRENT PRECIPITATION AMOUNTS ARE NOT FORECAST TO BE TERRIBLY HIGH INTO THIS WEEKEND. RIVER AND STREAM FORECASTS ARE NOT CALLING FOR ANY FLOODING THROUGH THIS WEEKEND. YOU SHOULD STILL BE CAREFUL AROUND ANY RIVERS OR STREAMS THAT APPEAR HIGH AND RUNNING FASTER THAN USUAL. .SPOTTER INFORMATION STATEMENT... WE ASK TRAINED SPOTTERS AND CITIZENS TO REPORT SIGNIFICANT WEATHER CONDITIONS WHEN IT IS SAFE TO DO SO. THESE CONDITIONS MAY INCLUDE HAIL...TORNADOES...STRONG WIND...DUST STORMS...SNOWFALL... EXTREME COLD TEMPERATURES...FREEZING RAIN OR HEAVY RAIN...DENSE FOG...AND FLOODING OR ICE JAMS. INFORMATION ABOUT THESE HAZARDOUS CONDITIONS SHOULD BE CALLED INTO YOUR NATIONAL WEATHER SERVICE OFFICE IN POCATELLO USING THE 1-800 SEVERE WEATHER HOTLINE...OR 208-233-0834.
The Pocatello radar (KSFX), 133 km away, was scanning. The volume nearest the first event began at 01:32 UTC.
8 thunderstorm wind. Local standard time, as filed.
Wind gusts from a thunderstorm estimated at 65 mph which downed trees in Gannett Canyon.
Thunderstorm wind gusts of 60 mph reported 9 miles northeast of Hailey.
The Blaine County Emergency Manager reported several tree limbs down in the city of Hailey. This occurred along with downed power lines and roof damages to residences.
The Arco mesonet site measured 63 mph wind gusts from a thunderstorms. Several trees were blown over in the city of Arco and the wind destroyed a large plate glass window in a flower shop.
Sixty-five mph wind gust recorded 25 miles east of Arco.
Sixty-four mph wind measured 27 miles east northeast of Arco.
Trained spotter measured 67 mph wind gust near Howe.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2009Every state in 2009This day in weather historyWarnings in Idaho, April 2009
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: 167962, 167963, 167965, 167966, 167969, 167974, 167975, 167976.