Flash flooding occurred in Oneida County.
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.
Flash flooding occurred in Oneida County.
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 24, 12:33 PM MST, 4 hours 27 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 133 PM MDT MON AUG 24 2009 .DISCUSSION...COVECTION STARTING TO POP IN THE OPPOSITE CORNERS... THE NE AND THE SW. ALSO SEEING SOME DEVELOPMENT IN THE CEN MTNS AS THE AIRMASS DESTABILIZES WITH THE SFC HEATING. EXPECT GREATER COVERAGE IN THE EASTERN HIGHLANDS SINCE IT IS CLOSER TO THE UPPER TROF. WILL KEEP THE SNAKE RIVER PLAIN DRY. MOST OF THE CONVECTION SHOULD DIE OUT BY SUNSET. RESIDUAL MSTR WILL ALLOW FOR ISOLD TSTMS TUE AFTN AND EVE OVER THE MTNS WHERE RIDGTOP CONVERGENCE WILL BE THE DOMINANT FORCING MECH. FOR THE REST OF THE WEEK...UPPER RIDGING BECOMES DOMINANT. TEMPS WILL RETURN TO SUMMER VALUES. PRECIP SHOULD BE NONEXISTENT...EXCEPT FOR A RETURN TO ISOLD MTN TSTMS FRI AND SAT AS SOME MONSOON MSTR MAKES A RETURN. THE GFS SHOWS THE RIDGE PERSISTING THRU THE WEEKEND...WITH A SOME LOSS OF AMPLITUDE ON SUNDAY. IN CONTRAST...THE ECMWF TRIES TO BRING A SMALL CLOSED LOW INTO THE PAC NW FRI NIGHT. IT EVENTUALLY DIES IN PLACE SUN NIGHT...BUT IT WOULD INCREASE THE CHANCES FOR PRECIP OVER THE WEEKEND. WILL STAY WITH THE CURRENT FCST OF ISOLD MTN TSTMS... WHICH IS MORE IN LINE WITH THE GFS. HEDGES && .AVIATION...RIER CONDITIONS WILL CONTINUE TO FILTER INTO EASTERN IDAHO DURING THE NEXT 24 HOURS. SHOWERS/STORMS ARE POSSIBLE OVER HIGHER TERRAIN WITH A MUCH LOWER CHANCE TONIGHT AND TUESDAY. VFR CONDITIONS WILL PREVAIL. THERE MIGHT TEMPORARY LOWER VIS/CIGS ASSOCIATED WITH CONVECTIVE ACTIVITY DUE TO HEAVIER RAIN. AT THIS TIME...IT APPEARS LOW CLOUDS WILL NOT BE A PROBLEM TONIGHT AT ANY TAF SITES. KEYES && .FIRE WEATHER...MONSOON MOISTURE WILL CONTINUE TO DECREASE AND BE REPLACED WITH DRIER AIR AND A RIDGE. SHOWERS AND STORMS ARE POSSIBLE OVER THE SOUTHERN AND EASTERN MOUNTAINS INTO THIS EVENING BEFORE DECREASING TO JUST ISOLATED OVER THE SAME AREAS TONIGHT AND TUESDAY. DRY CONDITIONS ARE FORECAST THROUGH MIDWEEK. BY THE WEEKEND...THE FORECAST IS STILL QUITE UP IN THE AIR...LITERALLY. THE GFS IS MAINTAINING AN OVERALL RIDGE WITH WEAK ENERGY SKIRTING AROUND THE EDGE OF IT...WHICH WOULD SERVE TO TEMPORARILY WEAKEN IT AND PRODUCE A FEW SHOWERS AND STORMS ACROSS NORTHERN AREAS ONLY. THE ECMWF - OR THE EUROPEAN MODEL - SHOWS A COMPACT CLOSED LOW MOVING SLOWING THROUGH THE AREA...WHICH WOULD MEAN A BETTER CHANCE OF SHOWERS AND STORMS DURING THE PERIOD. THE GFS IS SHOWING WHAT WE TYPICALLY SEE...THE ECMWF IS SHOWING WHAT WE HAVE ACTUALLY SEEN FROM TIME TO TIME THIS SUMMER. THE CURRENT FORECAST HAS ISOLATED ACTIVITY FOR THE MOUNTAINS WITH A LITTLE RH AND WITH SLIGHTLY COOLER WEATHER AND THAT WAS WHAT THE PREVIOUS SHIFT HAD PUT IN. KEYES && .PIH WATCHES/WARNINGS/ADVISORIES... NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 348 AM MDT MON AUG 24 2009 IDZ017>025-031-032-251000- 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- 348 AM MDT MON AUG 24 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT MONSOONAL MOISTURE AND A WEAK BOUNDARY WILL CONTINUE TO BRING ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS IN THE LOWER AND UPPER SNAKE HIGHLANDS...CARIBOU HIGHLANDS AND THE SOUTH CENTRAL HIGHLANDS TODAY. SMALL HAIL AND WIND GUSTS UP TO 45 MPH ARE POSSIBLE WITH AFTERNOON THUNDERSTORMS TODAY. .DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY RESIDUAL MONSOONAL MOISTURE WITH DAY TIME HEATING WILL ALLOW FOR AFTERNOON ISOLATED SHOWERS AND THUNDERSTORMS OVER THE EASTERN EDGE OF THE UPPER SNAKE HIGHLANDS AND CARIBOU HIGHLAND MOUNTAIN ON TUESDAY. DRIER AND WARMER WEATHER WILL ARRIVE MID WEEK WITH HIGH PRESSURE BUILDING IN OVER THE AREA. .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.
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE POCATELLO 238 PM MDT MON AUG 24 2009 IDZ022-242130- CASSIA ID- 238 PM MDT MON AUG 24 2009 THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... CASSIA COUNTY IN SOUTH CENTRAL IDAHO UNTIL 330 PM MDT. AT 233 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED SEVERAL THUNDERSTORMS OVER PORTIONS OF CASSIA COUNTY..MOVING EAST AT 10 MPH. SMALL HAIL IS POSSIBLE WITH THESE STORMS...ALONG WITH HEAVY RAIN. LOCATIONS IMPACTED INCLUDE... MALTA... OAKLEY... ALMO... ELBA... ALBION... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 4199 11427 4240 11427 4242 11300 4199 11300 TIME...MOT...LOC 2034Z 284DEG 10KT 4223 11342 JKEYES
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
331 PM MDT MON AUG 24 2009
IDZ022-242230-
ONEIDA ID-POWER ID-CASSIA ID-
331 PM MDT MON AUG 24 2009
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
SOUTHEASTERN CASSIA COUNTY IN SOUTH CENTRAL IDAHO
SOUTH CENTRAL POWER COUNTY IN SOUTHEAST IDAHO
WEST CENTRAL ONEIDA COUNTY IN SOUTHEAST IDAHO
UNTIL 430 PM MDT
AT 328 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
CLUSTER OF THUNDERSTORMS EXTENDING FROM NEAR HOLBROOK TO 11 MILES
SOUTH OF SUBLETT TO 5 MILES NORTHWEST OF ELBA...MOVING SLOWLY
SOUTH AT 5 MPH.
SMALL HAIL WITH WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE
STORMS...ALONG WITH HEAVY RAIN.
LOCATIONS IMPACTED INCLUDE...
KEOGH...
ELBA...
LAT...LON 4231 11263 4205 11305 4201 11372 4242 11379
4235 11319 4254 11275
TIME...MOT...LOC 2130Z 331DEG 3KT 4233 11278 4216 11312
4231 11361
HUSTONSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
433 PM MDT MON AUG 24 2009
IDZ021>023-242330-
ONEIDA ID-POWER ID-BANNOCK ID-CASSIA ID-
433 PM MDT MON AUG 24 2009
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTHEASTERN CASSIA COUNTY IN SOUTH CENTRAL IDAHO
CENTRAL BANNOCK COUNTY IN SOUTHEAST IDAHO
SOUTHERN POWER COUNTY IN SOUTHEAST IDAHO
NORTHWESTERN ONEIDA COUNTY IN SOUTHEAST IDAHO
UNTIL 530 PM MDT
AT 427 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED AN
AREA OF THUNDERSTORMS SOUTH OF A LINE EXTENDING FROM BUIST TO 13
MILES SOUTHWEST OF CRYSTAL TO 5 MILES SOUTH OF ROCKLAND TO SUBLETT.
THESE STORMS WERE GENERALLY WEAKENING WHILE A GUST FRONT WAS
SPREADING NORTH TOWARD ROCKLAND...RAFT RIVER AND MCCAMMON.
WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THESE STORMS...ALONG WITH
MODERATE RAIN.
LOCATIONS IMPACTED INCLUDE...
ROCKLAND...
HEGLAR...
LAT...LON 4224 11234 4234 11259 4223 11287 4219 11319
4259 11316 4273 11285 4274 11259 4256 11231
TIME...MOT...LOC 2229Z 184DEG 5KT 4237 11244 4249 11264
4250 11287 4233 11308
HUSTONSPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO
524 PM MDT MON AUG 24 2009
IDZ022-250030-
ONEIDA ID-
524 PM MDT MON AUG 24 2009
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
ONEIDA COUNTY IN SOUTHEAST IDAHO
UNTIL 630 PM MDT
AT 523 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR HOLBROOK..MOVING SOUTHEAST 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...
HOLBROOK...
LAT...LON 4219 11281 4232 11264 4215 11231 4199 11252
4199 11260
TIME...MOT...LOC 2324Z 314DEG 4KT 4220 11264
HUSTONThe Salt Lake City radar (KMTX), 103 km away, was scanning. The volume nearest the first event began at 00:02 UTC.
1 flash flood. Local standard time, as filed.
Rural roads were flooded with as much as 14 inches of water over the roadways. The largest was 12 feet wide.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2009Every state in 2009This day in weather historyWarnings in Idaho, August 2009
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: 194573.