Straight line non thunderstorm winds caused power poles to snap off 10 miles southeast of Ashton. Additional downed power lines occurred 13 miles southeast of Ashton, 11 miles southeast of Ashton, and 3 miles west of St Anthony.
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.
Straight line non thunderstorm winds caused power poles to snap off 10 miles southeast of Ashton. Additional downed power lines occurred 13 miles southeast of Ashton, 11 miles southeast of Ashton, and 3 miles west of St Anthony.
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 Jun 29, 9:04 AM MST, 1 hour 56 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 1004 AM MDT WED JUN 29 2011 .UPDATE...THE QPF AMOUNTS WERE ADUSTED SLIGHTLY HIGHER FOR THIS AFTERNOON AND EVENING BASED ON MORNING SOUNDINGS AT BOISE SHOWING PRECIPITABLE WATER UP TO .9 INCH AND COORDINATION WITH NORTHWEST RIVER FORECAST CENTER. THE 12Z GUIDANCE FOR SURFACE WINDS ARE A BIT LOWER THAN WIND ADVISORY LEVELS...HOWEVER THE ELKO SOUNDING SHOWS 46KTS OF WIND AT 7K FT MSL...OR ABOUT 53 MPH THAT COULD SURFACE LATER TODAY. WILL KEEP THE ADVISORY GOING...BESIDES THE NAM12 BOUNDARY LAYER WINDS ARE RUNNING 30-35 KTS. BETWEEN 00-03Z THE NAM12 ALSO SPLITS THE 700 MB WIND FLOW AS THE LOW MOVES INLAND AND DIPS SOUTH TOWARDS DESERT ROCK...THAT COULD LIMIT CONVECTION IN SOUTHEAST IDAHO THIS EVENING. RS && .PREV DISCUSSION... /ISSUED 401 AM MDT WED JUN 29 2011/ SHORT TERM...TODAY THROUGH FRI NIGHT. TROUGH AND CLOSED LOW STILL TRACKING FOR AN ARRIVAL TONIGHT OVER EASTERN IDAHO. THUNDERSTORMS WENT UNTIL LATE TUE NIGHT AND STILL GOING ON IN THE WFO BOISE AREA. SPC HAS PUT SMALL PORTION OF CUSTER COUNTY IN A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE NEXT 24 HOURS. STRONG SHEAR AND DIFFLUENCE ALOFT ARE CONTRIBUTING TO THE POSSIBLE DEVELOPMENT. THE STRONG DYNAMICS ALOFT ALSO CONTRIBUTE TO THE REASONING BEHIND THE WIND ADVISORY FOR MUCH OF THE NORTHERN AND EASTERN FORECAST AREA THIS AFTERNOON AND EVENING. THUNDERSTORM ACTIVITY EXPECTED TO CONTINUE BEYOND MIDNIGHT TONIGHT...BUT THINGS IMPROVE SIGNIFICANTLY IN THIS AREA FOR THU. BUT WIND SHOULD RETURN FOR THE AFTERNOON AND BE EVEN STRONGER WITH A MUCH STRONGER SLP GRADIENT ALONG WITH CONTINUED UPPER LEVEL SUPPORT AND INSTABILITY. HOWEVER DIRECTION SHOULD BE MORE WESTERLY THAN SOUTHERLY. OROGRAPHICALLY INDUCED SHOWERS AND THUNDERSTORMS ARE THE ONLY RISK FOR FRI AFTERNOON/EVENING WITH TEMPERATURES BOTTOMING OUT BEHIND THE TODAY/TONIGHT LOW. MESSICK LONG TERM...SAT THROUGH TUE NIGHT. UPPER LEVEL...FAST ZONAL FLOW CONTINUES FOR THIS PERIOD. BY NEXT MON...GUIDANCE HINTS AT SUBTROPICAL MOISTURE FINALLY WORKING AROUND THE HIGH AND INTO NEVADA AND SOUTHERN IDAHO. THIS COULD FRANKLY HAPPEN AT ANY TIME...DEPENDING ON THE ACTUAL SHAPE THE HIGH TAKES ON. IF THE NORTHWEST QUADRANT FLOW AROUND THE HIGH IS A LITTLE MORE SOUTHERLY...THIS MOISTURE COULD ARRIVE MUCH SOONER. HOWEVER...NO GREAT AMOUNTS OF PRECIPITATION OR MAJOR THUNDERSTORM OUTBREAKS ARE EXPECTED AT THIS TIME. MESSICK HYDROLOGY...MAIN STEM RIVERS CONTINUE IN FLOOD CONDITIONS FOR TETON RIVER IN ST ANTHONY AND HENRYS FORK IN REXBURG. SNOW MELT CONTINUES TO BE THE MAIN FACTOR IN THIS...SO STAGES WILL HAVE A DIURNAL CYCLIC RESPONSE AS MELT SLOWS OVERNIGHT AND WITH THE SLIGHTLY COLDER WEATHER DUE TO A LOW MOVING INTO EASTERN IDAHO. THIS IS THE SAME REASONING BEHIND THE SMALL RIVER AND CREEK ADVISORY WHICH CONTINUES FOR THE UPPER SNAKE DRAINAGE AND BEAR RIVER/LAKE BASINS. MESSICK AVIATION... A COLD FRONT WILL SLOWLY MOVE INTO THE AREA TONIGHT. ISOLATED THUNDERSTORMS WILL BE POSSIBLE AHEAD OF THE FRONT. SIGNIFICANT IMPACTS TO TAF SITES FROM STORMS IS UNLIKELY. KSUN COULD HAVE SOME STORMS IN THE VICINITY AND CB WILL LIKELY BE NOTED IN THE HILLS NEAR KPIH AND KIDA. THE BIGGER IMPACT WILL BE WITH WINDS WHICH WILL BE STRONG THIS AFTERNOON ESPECIALLY FROM KPIH TO KIDA. VALLE FIRE WEATHER...STRONG GUSTY WINDS ARE LIKELY TODAY FOR MUCH OF 410/411/412/413 AND THE EASTERN HALF OF 476. A COLD FRONT WILL SLOWLY MOVE INTO THE REGION TONIGHT. THUNDERSTORMS WILL BE POSSIBLE FOR PORTIONS OF THE CENTRAL MOUNTAINS AND EASTERN HIGHLANDS TODAY. COOLER TEMPS ARE EXPECTED FOR THURSDAY. GUSTY WINDS WILL REMAIN LIKELY FOR THE SNAKE PLAIN ON THURSDAY. VALLE && .PIH WATCHES/WARNINGS/ADVISORIES... WIND ADVISORY UNTIL 9 PM MDT THIS EVENING IDZ019>025-032. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 341 AM MDT WED JUN 29 2011 IDZ017>025-031-032-301200- 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- 341 AM MDT WED JUN 29 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT A WIND ADVISORY IS IN EFFECT FOR A LARGE PORTION OF EASTERN IDAHO. CHECK THE LATEST URGENT WEATHER MESSAGE FOR DETAILS. ISOLATED TO SCATTERED THUNDERSTORMS ARE EXPECTED THIS MORNING AND THIS AFTERNOON AND EVENING. HAIL...AND STRONG GUSTY WIND UP TO 55 MPH ARE POSSIBLE IN THESE STORMS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY STRONG WINDS WILL LIKELY CONTINUE THURSDAY. ISOLATED MOUNTAIN SHOWERS AND THUNDERSTORMS ARE EXPECTED WITH HIGH PRESSURE OVER THE AREA FOR MOST OF THIS PERIOD. .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. MESSICK
1 high wind. Local standard time, as filed.
Straight line non thunderstorm winds caused power poles to snap off 10 miles southeast of Ashton. Additional downed power lines occurred 13 miles southeast of Ashton, 11 miles southeast of Ashton, and 3 miles west of St Anthony.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2011Every state in 2011This day in weather historyWarnings in Idaho, June 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: 327488.