Heavy rain and large hail occurred in portions of southeastern 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.
Heavy rain and large hail occurred in portions of southeastern 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 Aug 21, 7:25 AM MST, 5 hours 10 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 825 AM MDT THU AUG 21 2014 .UPDATE...SHORTWAVE AXIS MOVING INTO EAST IDAHO FCST AREA THIS MORNING PER SAT IMAGERY. STRONG DRYING WITH CLEAR SKIES BEHIND AXIS. BAND OF SHOWERS EXTENDING THROUGH SOUTHEAST CORNER OF FCST AREA WITH A FEW LIGHTNING STRIKES ALONG UTAH BORDER. OBSERVATIONS INDICATE SLIGHTLY HIGHER AMOUNTS THAN FORECAST. HAVE NUDGED POPS UP THIS MORNING FOR EASTERN AND SOUTHERN HIGHLANDS ASSOCIATED WITH BAND MOVING THROUGH REGION BUT KEPT TSTORM COVERAGE ISOLATED. NEXT SHORTWAVE ALREADY REACHING SEATTLE/VANCOUVER REGION THIS MORNING AND SHOULD REACH WESTERN IDAHO BY LATE TODAY. DESTABILIZATION IN CLEAR AIR REGION THIS MORNING POSSIBLE BY AFTERNOON AHEAD OF THIS NEXT FEATURE SO WILL LEAVE POPS ACROSS ENTIRE REGION. DMH && .PREV DISCUSSION... /ISSUED 334 AM MDT THU AUG 21 2014/ SHORT TERM...TODAY THROUGH SATURDAY NIGHT. CURRENT WATER VAPOR IMAGERY SHOWS THE UPPER LEVEL TROUGH MAINLY OVER OUR EASTERN AREAS WITH A DRY SLOT STARTING TO APPROACH WESTERN IDAHO. EXPECT ISOLATED CONVECTION ACROSS OUR WESTERN AREAS WITH SCATTERED TO NUMEROUS SHOWERS WITH ISOLATED TO SCATTERED THUNDERSTORMS ACROSS OUR SOUTHERN AND EASTERN AREAS TODAY. FRIDAY MODELS CONTINUE TO BE CONSISTENT IN DROPPING AN UPPER LEVEL LOW OVER EASTERN WASHINGTON BRINGING WIDESPREAD PRECIPITATION ACROSS THE AREA. PRECIPITABLE WATER AMOUNTS ARE AROUND ONE INCH ACROSS THE AREA. LOCALIZED FLOODING WILL BE POSSIBLE. MODELS ARE SHOWING A DRY SLOT ACROSS THE SNAKE RIVER PLAIN BRINGING DRIER CONDITIONS AND BREEZY TO MODERATE WINDS FRIDAY. THE UPPER LEVEL LOW SHIFTS EAST OVER NORTHERN IDAHO SATURDAY MORNING AND THEN INTO MONTANA BY SATURDAY NIGHT. EXPECT SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS MAINLY OVER THE CENTRAL MOUNTAINS AND EASTERN HIGHLANDS ON SATURDAY. EXPECT BELOW NORMAL TEMPERATURES TODAY BECOMING 8 TO 12 DEGREES BELOW NORMAL BY SATURDAY. WYATT LONG TERM...SUNDAY THROUGH NEXT THURSDAY. EXPECT ISOLATED PRECIPITATION CHANCES MAINLY IN THE MOUNTAINS ON SUNDAY IN WEST TO NORTHWEST FLOW. MODELS ARE CONSISTENT IN BRINGING ANOTHER UPPER LEVEL LOW ACROSS THE AREA ON MONDAY BRINGING MODERATE TO HIGH PRECIPITATION CHANCES PARTICULARLY ACROSS OUR NORTHERN AREAS. MODELS START TRENDING DRIER IN NORTHWEST FLOW TUESDAY AND EVEN MORE SO ON WEDNESDAY. LOOK FOR MOSTLY DRY CONDITIONS IN SOUTHWEST FLOW ON THURSDAY AHEAD OF THE NEXT SYSTEM. EXPECT WELL BELOW NORMAL TEMPERATURES EARLY IN THE PERIOD BECOMING SLIGHT ABOVE NORMAL BY THURSDAY. WYATT AVIATION...SHOWERS AND THUNDERSTORMS WILL REMAIN ACROSS THE AREA THROUGH FRIDAY. VFR WEATHER WILL BE THE NORM EXCEPT FOR PERIODS OF HEAVIER RAINFALL...WHICH MAY CAUSE TEMPORARY REDUCTIONS IN VISIBILITY. WINDS WITH STORMS AND OUTFLOW BOUNDARIES MAY EXCEED 30KTS. KEYES/RS FIRE WEATHER...A LOW PRESSURE DISTURBANCE OVER SOUTHEAST IDAHO THIS MORNING WITH WIDELY SCATTERED TO SCATTERED SHOWERS OF RAIN WITH AT LEAST ISOLATED THUNDERSTORMS THIS MORNING. THE DISTURBANCE WILL BE MOVING TO THE EAST THIS AFTERNOON...ALLOWING SOME DRIER AIR TO MOVE INTO THE CENTRAL MOUNTAINS FROM THE WEST. THIS WILL BE ONLY A TEMPORARY BREAK IN ACTIVITY. A NEW LOW PRESSURE CIRCULATION WILL BE MOVING FROM BRITISH COLUMBIA TO NORTHERN OREGON BY FRIDAY AFTERNOON AND WILL SUPPORT SCATTERED TO NUMEROUS RAIN SHOWERS ACROSS SOUTHEAST IDAHO WITH WIDELY SCATTERED EMBEDDED THUNDERSTORMS. FRIDAY WILL BE ANOTHER GOOD DAY FOR WETTING RAINS. SATURDAY THE LOW MOVES RIGHT OVER THIS AREA. THERE WILL BE SOME 10 TO 20 MPH WESTERLY WINDS IN THE SNAKE PLAIN BUT MINIMUM AFTERNOON HUMIDITY SHOULD BE NO LOWER THAN THE LOWER TO MIDDLE 20S. ANOTHER DISTURBANCE WILL DROP INTO THIS AREA BY MONDAY. THE BEST OPPORTUNITY FOR DRYING CONDITIONS IS WEDNESDAY AND THURSDAY OF NEXT WEEK WITH A BRIEF PERIOD OF HIGH PRESSURE THAT GIVES WAY TO MORE WESTERLIES BY WEEKS END. RS && .PIH WATCHES/WARNINGS/ADVISORIES... NONE. &&
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE POCATELLO ID 103 PM MDT THU AUG 21 2014 IDZ020-032-211945- BUTTE ID-CUSTER ID- 103 PM MDT THU AUG 21 2014 THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... SOUTHEASTERN CUSTER COUNTY IN CENTRAL IDAHO WEST CENTRAL BUTTE COUNTY IN EAST CENTRAL IDAHO UNTIL 145 PM MDT AT 100 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM NEAR GROUSE..MOVING EAST AT 5 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN. LOCATIONS IMPACTED INCLUDE... RURAL WESTERN BUTTE COUNTY... RURAL SOUTHEASTERN CUSTER COUNTY... LAT...LON 4391 11328 4348 11326 4361 11369 4379 11370 TIME...MOT...LOC 1904Z 268DEG 6KT 4371 11357 DMH
The Pocatello radar (KSFX), 150 km away, was scanning. The volume nearest the first event began at 19:37 UTC.
3 hail, 1 flash flood. Local standard time, as filed.
Hail one inch in diameter fell in the city of Ketchum. The hail accumulated up to a depth of 2 inches on sidewalks in spots.
COOP Observer reported 1 to 2 inches of water flowing across Highway 93 in the city of Arco. Minor residential flooding occurred with some flooding at the hospital. A city bridge on Era street washed out and the street was closed and minor flooding occurred on Highway 33.
One inch hail photographed and placed on social media occurred in the city of Roberts.
One inch hail reported 4 miles west northwest of the town of Lorenzo.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2014Every state in 2014This day in weather historyWarnings in Idaho, August 2014
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: 540679, 540677, 540675, 540676.