On the afternoon os September 1st two torandoes touched down in Cassia County between 4 and 5 pm MDT. One was just east of Declo and the second was 5 miles east northeast of Albion.
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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.
On the afternoon os September 1st two torandoes touched down in Cassia County between 4 and 5 pm MDT. One was just east of Declo and the second was 5 miles east northeast of Albion.
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 Sep 1, 12:58 PM MST, 2 hours 22 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE POCATELLO ID 158 PM MDT SAT SEP 1 2012 .SHORT TERM...TSTMS DEVELOPING THIS AFTN AHEAD OF THE NORTHERN STREAM UPPER TROF NEAR THE DIVIDE...WHILE THE SOUTHERN STREAM UPPER TROF IS RESPONSIBLE FOR TSTMS OVER THE EASTERN HIGHLANDS. TSTMS WILL SPREAD TO THE SOUTHERN HIGHLANDS LATER THIS AFTN AS CONVECTION OVER NV AND UT MOVES NORTHWARD. PRECIPITABLE WATER VALUES ARE RUNNING HIGH AGAIN TODAY...SO TSTMS SHOULD PRODUCE MEASURABLE RAINFALL AMOUNTS. TSTMS DIMINISH LATER THIS EVENING AS THE UPPER FLOW DAMPENS OUT THE TROFS....LEADING TO DRY CONDITIONS ON SUNDAY. .LONG TERM...NEXT WEEK LOOKS TO BE DRY THE ENTIRE PERIOD AS THE UPPER FLOW TURNS TO THE NW. THE GFS BRINGS A NORTHERN STREAM UPPER TROF INTO MT ON THU...BUT THE EFFECTS ARE EXPECTED TO REMAIN EAST OF THE DIVIDE. TEMPS WILL GRADUALLY WARMING DURING THE WEEK. HEDGES && .AVIATION...EXPECT MORE SHOWERS AND THUNDERSTORMS THIS AFTERNOON INTO EARLY EVENING WITH MONSOON MOISTURE IN PLACE AND A WEAK BOUNDARY MOVING THROUGH. LOOK FOR VICINITY SHOWERS FOR KSUN AND VICINITY THUNDERSTORMS FOR THE REST OF THE TAF SITES. EXPECT BREEZY WINDS WITH GUSTS NEAR 20 MPH THIS AFTERNOON FOR THE SNAKE RIVER PLAIN. LOOK FOR OUTFLOW GUSTS IN AND AROUND THUNDERSTORMS UP TO 50 MPH. WITH A THUNDERSTORM ON STATION CIGS COULD DROP BRIEFLY TO MVFR. WYATT && .FIRE WEATHER...EXPECT MORE SHOWERS AND THUNDERSTORMS THIS AFTERNOON INTO EARLY EVENING WITH MONSOON MOISTURE IN PLACE AND A WEAK BOUNDARY MOVING THROUGH. LOOK FOR SCATTERED THUNDERSTORMS ACROSS ZONES 410...411...412...413 AND 476 THUS A RED FLAG HAS BEEN ISSUED. EXPECT GUSTY OUTFLOWS OF 40 TO 50 MPH IN AND AROUND THUNDERSTORMS. OTHERWISE...EXPECT BREEZY WINDS AROUND 25 TO 30 MPH ESPECIALLY ACROSS RIDGE TOPS AND THE SNAKE RIVER PLAIN. EXPECT BETWEEN .1 AND .2 INCHES OF RAIN WITH LOCALLY HEAVIER AMOUNTS. EXPECT DRY CONDITIONS AND GRADUAL WARMING THROUGH THE WEEK WITH WEST TO NORTHEAST FLOW. WYATT && .PIH WATCHES/WARNINGS/ADVISORIES... RED FLAG WARNING UNTIL 10 PM MDT THIS EVENING IDZ410>413-476. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE POCATELLO ID 457 AM MDT SAT SEP 1 2012 IDZ017>025-031-032-021100- 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- 457 AM MDT SAT SEP 1 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR EASTERN IDAHO. .DAY ONE...TODAY AND TONIGHT EXPECT SHOWERS AND ISOLATED THUNDERSTORMS TODAY THROUGH EARLY EVENING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME. .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 ID
306 PM MDT SAT SEP 1 2012
IDZ022>024-012200-
CARIBOU ID-ONEIDA ID-BANNOCK ID-FRANKLIN ID-
306 PM MDT SAT SEP 1 2012
THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
WEST CENTRAL FRANKLIN COUNTY IN SOUTHEAST IDAHO
SOUTHEASTERN BANNOCK COUNTY IN SOUTHEAST IDAHO
EAST CENTRAL ONEIDA COUNTY IN SOUTHEAST IDAHO
SOUTHWESTERN CARIBOU COUNTY IN SOUTHEAST IDAHO
UNTIL 400 PM MDT
AT 301 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR CHERRY CREEK...MOVING NORTH AT 35 MPH.
HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 45 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE...
SWAN LAKE...
VIRGINIA...
LAT...LON 4203 11210 4209 11233 4265 11216 4255 11174
4241 11184 4241 11190 4233 11190
TIME...MOT...LOC 2106Z 200DEG 29KT 4215 11217
EPThe Pocatello radar (KSFX), 97 km away, was scanning. The volume nearest the first event began at 22:19 UTC.
2 tornado. Local standard time, as filed.
A tornado was spotted with confirmation with photos east of Declo. The tornado occurred in open land and caused no damage and was not long lasting.
A weak tonado was confirmed with photographs about 4 to 5 miles east northeast of Albion. It was in open land and did no damage.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Idaho in 2012Every state in 2012This day in weather historyThe tornado archive for Idaho, 2012Warnings in Idaho, September 2012
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: 414463, 414464.