Thunderstorm winds destroyed flag pole and chicken coop at residence in Roberts and items blown 200 feet from house.
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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 PIH wrote it up.
Thunderstorm winds destroyed flag pole and chicken coop at residence in Roberts and items blown 200 feet from house.
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 May 20, 12:36 PM MST, 6 hours 24 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 136 PM MDT SUN MAY 20 2012 .SHORT TERM...TONIGHT THROUGH WEDNESDAY. BROAD UPPER RIDGE DOMINATES THE WEST TODAY...ALTHOUGH SOME MID LEVEL MOISTURE IS MAKING ITS WAY THROUGH. THIS WILL RESULT IN MORE CLOUDINESS THRU TONIGHT. THE UPPER RIDGE MOVES OFF TO THE EAST ON MONDAY AS AN UPPER TROF MOVES INTO THE PAC NW. WITH INCREASING MOISTURE FLOW DUE TO THE STRONG WEST TO SW WINDS ALOFT...SHOWERS AND A FEW TSTMS WILL BE POSSIBLE MONDAY AFTERNOON AND NIGHT OVER THE CENTRAL MTNS AND UPPER SNAKE HIGHLANDS. A STRONG COLD FRONT PASSES THROUGH EASTERN ID TUE MORN...SPREADING SHOWERS AND A FEW TSTMS ACROSS THE FCST AREA. THE BEST CHANCES WILL BE IN THE MTNS. THE FRONT WILL BE ACCOMPANIES BY STRONG SW WINDS ON TUE...ALONG WITH SHARPLY COOLER TEMPS. VERY STRONG WEST WINDS ALOFT WILL GIVE AN ADDITIONAL BOOST TO THE SURFACE WINDS ON TUE. AS THE OVERALL TROF PATTERN DEEPENS OVER THE REGION...SHOWERS WILL CONTINUE TO BE A THREAT ON WED. TEMPS WILL REMAIN ON THE COOL SIDE. HEDGES .LONG TERM...WEDNESDAY NIGHT THROUGH SUNDAY. AGAIN MADE VERY FEW CHANGES TO CURRENT GRIDS. EASTERN IDAHO REMAINS UNDER INFLUENCE OF DEEP UPPER LOW OVER PACNW AND NORTHERN ROCKIES THROUGH MUCH OF THE EXTENDED. REINFORCING SHORTWAVE STEEPLY DEEPENS TROUGH LATE FRIDAY THROUGH THE REMAINDER OF THE WEEKEND. MODEL DIFFERENCES IN THE DETAILS MAKE ALL THE DIFFERENCE WITH PLACEMENT OF THE CENTER OF THE UPPER LOW DICTATING AMOUNT OF MOISTURE ACROSS THE REGION. OPTED TO KEEP GOING FORECAST WITH POPS AT OR ABOVE CLIMO THROUGH THE PERIOD. DMH && .AVIATION...VFR CONDITIONS WILL CONTINUE ALL AREAS THROUGH EARLY MONDAY DESPITE MID LEVEL CLOUD COVER MOST AREAS. DMH && .FIRE WEATHER...STRENGTHENING HIGH PRESSURE WILL PUSH ALL SERIOUS MOISTURE AND CONVECTIVE ACTIVITY FARTHER NORTH AND OUT OF THE FIRE WEATHER DISTRICT. THE HIGH WILL MAKE WIND TODAY AND MOST OF MON THERMALLY-DRIVEN WITH NORMAL UPSLOPE-DOWNSLOPE BEHAVIOR. TEMPERATURES WILL ONCE AGAIN WARM UP TO NEAR RECORD HIGHS FOR MON...BUT A STRONG COLD FRONT MON NIGHT/TUE STILL EXPECTED TO BRING TEMPERATURES DOWN...SCATTERED SHOWERS AND THUNDERSTORMS...AND STRONG WIND ALONG WITH A WIND SHIFT. AFTER THIS MAIN FRONT...MORE SHOWERS ON WED AND THEN A NORTHWESTERLY FLOW SHOULD MAKE CONDITIONS COOLER AND DRIER FOR THE REMAINDER OF THE WEEK. MESSICK && .PIH WATCHES/WARNINGS/ADVISORIES...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 427 AM MDT SUN MAY 20 2012 IDZ017>025-031-032-211030- 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- 427 AM MDT SUN MAY 20 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY ISOLATED AFTERNOON AND EVENING THUNDERSTORMS WILL BE POSSIBLE THROUGHOUT THE WEEK AND MAY BE CAPABLE OF PRODUCING STRONG OUTFLOW WINDS. STRONG WINDS WILL ALSO ACCOMPANY A COLD FRONT PASSING THROUGH THE AREA ON TUESDAY WITH WIND SPEEDS OF 35 TO 40 MPH POSSIBLE. .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), 82 km away, was scanning. The volume nearest the first event began at 02:03 UTC.
1 thunderstorm wind. Local standard time, as filed.
Thunderstorm winds destroyed flag pole and chicken coop at residence in Roberts and items blown 200 feet from house.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2012Every state in 2012This day in weather historyWarnings in Idaho, May 2012
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: 385768.