30 inches in 15 minutes caused extensive street flooding in the city of Challis.
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.
Rainfall of 0.30 inches in 15 minutes caused extensive street flooding in the city of Challis.
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 Jul 12, 2:51 AM MST, 9 hours 57 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 351 AM MDT TUE JUL 12 2011 .SHORT TERM...TODAY THROUGH THU NIGHT. UPPER LEVEL LOW IS SLOWLY PUSHING ONSHORE AND LIFTING TO THE NORTHEAST...SO SOUTHERLY FLOW WILL LINGER TODAY AND CREATE ANOTHER UNSTABLE AFTERNOON WITH SHOWERS AND THUNDERSTORMS EXPECTED. THE SOUTHERN END OF THE COLD FRONT ASSOCIATED WITH THIS TROUGH PUSHES THROUGH THE NORTHERN END OF THE FORECAST AREA ON THU. THIS WILL KEEP TEMPERATURES ON THE COOL SIDE...BUT NOT AS COOL AS THE NAM IS FORECASTING TODAY. HIGHLY DOUBT THE 78 DEGREE MAXIMUM FOR POCATELLO...SO THREW OUT THE NAM-12 SOLUTION IN FAVOR OF THE GFS-40. WIND CONTINUES LIGHT TODAY SO NO LAKE WIND ADVISORY. HOWEVER...LAKE WIND ADVISORY MAY BE NEEDED WED AFTERNOON AS THE TROUGH AND FRONT ENTER IDAHO. MESSICK .LONG TERM...FRI THROUGH MON NIGHT. UPPER LEVEL RIDGE STILL EXPECTED TO STRENGTHEN BY SAT OR SUN AND WARM UP IS EXPECTED THEN. CONTINUED LOW POPS...MAINLY IN THE MOUNTAINS. MESSICK && .AVIATION...WEATHER CONTINUES TO BE LIKE A BROKEN RECORD TODAY. THIS MEANS ANOTHER DAY OF VICINITY THUNDERSTORMS IN THE AFTERNOON AND EVENING HOURS. WINDS WILL BE GUSTY AROUND ANY THUNDERSTORM. OTHERWISE EXPECT MAINLY VFR CONDITIONS. HATTINGS && .FIRE WEATHER...MORE OF THE SAME TODAY WITH ANOTHER DAY OF SCATTERED SHOWERS AND THUNDERSTORMS...MAINLY IN THE AFTERNOON AND EVENING HOURS WITH THE BEST CONCENTRATION AROSS THE HIGHER ELEVATIONS. STRONG AND GUSTY WINDS ALONG WITH LOCALLY HEAVY RAINS COULD OCCUR WITH ANY THUNDERSTORM. AN UPPER LEVEL LOW MOVING INTO THE WASHINGTON COAST ON WEDNESDAY AND THEN SKIRTING THE US-CANADIAN BORDER WILL HELP SHUT OFF THE MONSOONAL MOISTURE AND SHIFT THE FOCUS OF AFTERNOON THUNDERSTORMS TO THE CENTRAL MOUNTAINS WHERE THE BEST INSTABILITY WILL BE FOUND. WARMER AND DRIER CONDITIONS ARE EXPECTED FOR EARLY NEXT WEEK AS RIDGING BUILDS ACROSS THE AREA. HATTINGS && .HYDROLOGY...TETON RIVER IN THE DRIGGS AREA CONTINUES TO HAVE FLOODING PROBLEMS. FLOODING AT THE SNAKE RIVER IN BLACKFOOT IS DOWN TO MINOR AND SHOULD GRADUALLY RECEDE DURING THE NEXT 24 TO 48 HOURS. MESSICK && .PIH WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 702 AM MDT TUE JUL 12 2011 IDZ017>025-031-032-131200- 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- 702 AM MDT TUE JUL 12 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. ISOLATED THUNDERSTORMS ARE POSSIBLE THROUGOUT TODAY AND THIS EVENING. .DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW. ISOLATED THUNDERSTORMS WILL CONTINUE TO BE A RISK EACH AFTERNOON AND EVENING UNTIL SATURDAY WHEN DRIER AND MORE STABLE AIR MOVES INTO SOUTHERN IDAHO. .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.
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
125 PM MDT TUE JUL 12 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0124 PM HAIL CHALLIS 44.51N 114.22W
07/12/2011 E0.75 INCH CUSTER ID EMERGENCY MNGR
VERY HEAVY RAINFALL WITH STORM.
&&
GWICKLUNSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
129 PM MDT TUE JUL 12 2011
IDZ018-032-122015-
CUSTER ID-
129 PM MDT TUE JUL 12 2011
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTH CENTRAL CUSTER COUNTY IN CENTRAL IDAHO
UNTIL 215 PM MDT
AT 124 PM MDT...STORM SPOTTERS REPORTED A STRONG THUNDERSTORM NEAR
CHALLIS..MOVING NORTHEAST AT 20 MPH.
HEAVY RAIN AND HAIL UP TO THE SIZE OF PENNIES IS EXPECTED WITH THIS
STORM.
LOCATIONS IMPACTED INCLUDE...
CHALLIS...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
LAT...LON 4476 11422 4475 11411 4473 11405 4467 11403
4460 11395 4431 11420 4443 11446
TIME...MOT...LOC 1927Z 206DEG 16KT 4448 11424
DSHPRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO
145 PM MDT TUE JUL 12 2011
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0132 PM HAIL 3 NNE CHALLIS 44.55N 114.20W
07/12/2011 M0.25 INCH CUSTER ID TRAINED SPOTTER
O.3O INCH OF RAIN IN 15 MINUTES. HAIL MEASURED 1/4 TO 3/8
INCH DIAMETER.
&&
GWICKLUNThe Boise radar (KCBX), 199 km away, was scanning. The volume nearest the first event began at 19:49 UTC.
1 flash flood. Local standard time, as filed.
Rainfall of 0.30 inches in 15 minutes caused extensive street flooding in the city of Challis.
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, July 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: 335279.