Very slow moving thunderstorms caused accumulations of very small hail in Jefferson and Bingham Counties along interstate 15. 3 to 6 inches fell in Roberts with several slide offs on roadways which also occurred in Firth and Shelley.
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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.
Very slow moving thunderstorms caused accumulations of very small hail in Jefferson and Bingham Counties along interstate 15. 3 to 6 inches fell in Roberts with several slide offs on roadways which also occurred in Firth and Shelley.
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 8, 1:01 PM MST, 3 hours 29 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 201 PM MDT WED APR 8 2015 .SHORT TERM...TONIGHT THROUGH SATURDAY. THE DEEP UPPER LOW OVER UT TODAY IS RESPONSIBLE FOR SCT RAIN/SNOW SHOWERS AND ISOLD TSTMS THIS AFTN ACROSS THE FCST AREA. MOST SIGNIFICANT PRECIP WILL BE ACROSS THE SOUTHERN HIGHLANDS...CLOSEST TO THE INFLUENCE OF THE UPPER LOW. UP TO 6 INCHES OF SNOW POSSIBLE AT HIGHER ELEVATIONS IN THE SOUTHERN HIGHLANDS BEFORE DIMINISHING LATER THIS EVE AS THE UPPER LOW MOVES OFF TO THE EAST. AN UPPER TROF MOVES ACROSS ID ON THU...SETTING OFF SCT SHOWERS AND ISOLD TSTMS MAINLY IN THE AFTN. A MINOR UPPER RIDGE BUILDS IN FOR FRI WITH ONLY ISOLD SNOW SHOWERS EXPECTED ALONG THE WY BORDER. THE RIDGE WILL BRING WARMER TEMPS ON FRI. AN UPPER TROF MOVES THRU THE PAC NW ON SAT..BRINGING SNOW SHOWERS TO THE CENTRAL MTNS AND ALONG THE DIVIDE. BREEZY CONDITIONS ALSO EXPECTED SAT AFTN. HEDGES .LONG TERM...SATURDAY NIGHT THROUGH WEDNESDAY. FAST MOVING SHALLOW DISTURBANCES SLIDES ACROSS NORTHERN IDAHO EARLY IN THE PERIOD WITH ANOTHER FOR MONDAY. SOME MINOR DIFFERENCES BETWEEN MODELS WITH ECMWF SLIGHTLY FASTER AND GFS SLOWER/MORE AMPLIFIED. BIGGER IMPACT ARRIVES TUESDAY THROUGH WEDNESDAY WITH DEEP SLOW MOVING TROUGH. BOTH MODELS SWING UPPER LOW ALONG IDAHO/UTAH BORDER ENDING IN CENTRAL WYOMING BY WEDNESDAY MORNING. VERY STRONG COLD FRONT ASSOCIATED WITH THIS FEATURE AND STRONG COLD ADVECTION TUESDAY NIGHT INTO WEDNESDAY ALONG WITH VERY TIGHT SFC GRADIENT. IMPRESSIVE GUIDANCE WIND SPEEDS FOR THIS FAR OUT AS WELL. CURRENT MODEL SCENARIOS PAINT SNOW LEVELS FALLING TO VALLEY FLOORS ALL AREAS WITH WRAP AROUND PRECIPITATION REACHING INTO EAST IDAHO. THIS SCENARIO WILL BE ONE TO WATCH CLOSELY NEXT SEVERAL DAYS AS THIS WILL BE A SIGNIFICANT MID APRIL SYSTEM FOR THE REGION. OVERALL...MADE MINOR TWEAKS FOR PRECIPITATION WITH EARLY SYSTEMS THEN LEFT AS IS FOR THE MAIN FEATURE WITH CURRENT POPS ALREADY HIGH ESPECIALLY HIGHER ELEVATIONS. TRENDED TEMPS SLIGHTLY COOLER THROUGH THE PERIOD BUT ESPECIALLY IN RESPONSE TO COLD ADVECTION PAINTED BY BOTH MODELS WITH MAIN FEATURE. DMH && .AVIATION...UPPER LOW OVER NRN UTAH ATTM WILL BE RESPONSIBLE FOR WIDESPREAD RAIN AND SNOW SHOWERS FOR TAF SITES INTO THIS EVENING. IFR CIGS AT BYI SHOULD LIFT INTO MVFR CIGS BY 21Z. MVFR CIGS PERSIST TO AROUND 03Z AT PIH WITH BORDERLINE VFR/MVFR CIGS AT IDA AND SUN PERSISTING INTO THIS EVENING. MAINLY VFR CIGS THEN EXPECTED FOR THE DURATION OF THE OVERNIGHT WITH POCKETS OF MVFR STRATUS LEFT BEHIND AS UPPER LOW SHIFTS INTO CENTRAL PLAINS. MEANWHILE...A SECONDARY TROF WILL SWEEP INTO THE PACNW LATE TONIGHT INTO TOMORROW...QUICKLY DROPPING CIGS BELOW AIRFIELD MINIMUMS AT SUN BY AROUND 09Z IN SHSN. RA/SNSH MAY ALSO DEVELOP ACROSS SNAKE PLAIN SITES AROUND 12Z...BRINGING SOME LOW MVFR CIGS...ESPECIALLY AT IDA. CONDITIONS SHOULD BEGIN TO IMPROVE JUST BEYOND THE END OF THE TAF PERIOD. AD/DMH && .PIH WATCHES/WARNINGS/ADVISORIES... WINTER WEATHER ADVISORY UNTIL MIDNIGHT MDT TONIGHT ABOVE 5500 FEET FOR THE IDZ022-023-025. &&
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE POCATELLO ID 446 PM MDT WED APR 8 2015 IDZ019-082315- FREMONT ID- 446 PM MDT WED APR 8 2015 THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... CENTRAL FREMONT COUNTY IN EASTERN IDAHO UNTIL 515 PM MDT AT 436 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 11 MILES SOUTHEAST OF LAST CHANCE OR ABOUT 15 MILES NORTHEAST OF ASHTON...MOVING SOUTH AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... WARM RIVER... LAT...LON 4406 11113 4403 11141 4427 11141 4430 11123 TIME...MOT...LOC 2244Z 351DEG 9KT 4420 11130 RS
The Pocatello radar (KSFX), 82 km away, was scanning. The volume nearest the first event began at 23:30 UTC.
2 hail. Local standard time, as filed.
Three to 6 inches of hail accumulated in Roberts. Several cars slid off roads and an INL bus got stuck in the ice. Snow plows were called out to plow the roads in the Roberts area.
As much as 1 to 4 inches of small hail accumulated on interstate 15 between Firth and Shelley and several slide offs and accidents were reported by area law enforcement. No injuries occurred in the accidents.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2015Every state in 2015This day in weather historyWarnings in Idaho, April 2015
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: 570753, 570757.