Alert archive / Idaho / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 13, NWS Pocatello, ID

September 1, 20125 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Sep 1, 2012, 4:56 PM MDT for 5 counties in Idaho. It was in force for 64 min. 2 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 1, 2012, 4:56 PM MDT (22:56 UTC)
Expired
Sep 1, 2012, 6:00 PM MDT
In force
64 min
Issued by
NWS Pocatello, ID
Area
Storm-based polygon

Counties Bannock County, ID, Bingham County, ID, Blaine County, ID, Cassia County, ID, Power County, ID

The radar

The Pocatello radar (KSFX), 31 km from the middle of the area, began a volume at 22:56 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Sep 1, 5:30 PM MDTTSTM WND GST 50Sw American Falls, IDALONG WITH STRONG WINDS...HAIL UP TO PENNY SIZE WAS REPORTED ALONG WITH VERY HEAVY RAINFALL. TIME WAS APPROXIMATED USING RADAR DATA.
Sep 1, 5:50 PM MDTTSTM WND DMG8 W American Falls, IDIDAHO POWER LOST THREE 60+ FOOT TOWERS NEAR RAST ROAD IN AMERICAN FALLS DUE TO THUNDERSTORM WIND GUSTS.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 10.9 hours before the alert went out and 238 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Salt Lake City I, UT at 12:00Z on 2012-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 158 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Salt Lake City I, UT at 12:00Z on 2012-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 98 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
158 J/kg
Mixed-layer CIN
-127 J/kg
Mixed-layer LCL
978 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
98 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

171 
WUUS55 KPIH 012256
SVRPIH
IDC005-011-013-031-077-020000-
/O.NEW.KPIH.SV.W.0013.120901T2256Z-120902T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
456 PM MDT SAT SEP 1 2012

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN BLAINE COUNTY IN CENTRAL IDAHO...
  NORTHEASTERN CASSIA COUNTY IN SOUTH CENTRAL IDAHO...
  NORTHWESTERN BANNOCK COUNTY IN SOUTHEAST IDAHO...
  THIS INCLUDES THE CITIES OF...POCATELLO...CHUBBUCK...
  SOUTHWESTERN BINGHAM COUNTY IN SOUTHEAST IDAHO...
  THIS INCLUDES THE CITIES OF...FORT HALL CITY...BLACKFOOT...
  ABERDEEN...
  POWER COUNTY IN SOUTHEAST IDAHO...
  THIS INCLUDES THE CITY OF AMERICAN FALLS...

* UNTIL 600 PM MDT

* AT 451 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A 
LARGE SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE   
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM EXTENDED 
FROM 19 MILES WEST OF AMERICAN FALLS TO 22 MILES SOUTHWEST OF 
AMERICAN FALLS TO 31 MILES SOUTHEAST OF RUPERT...AND MOVING 
NORTHEAST AT 40 MPH.

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
  ROCKLAND...
  STERLING...
  FORT HALL BANNOCK CREEK LODGE...
  FORT HALL BANNOCK PEAK...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS...LARGE HAIL...HEAVY RAIN AND DEADLY 
CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A 
SHELTER...PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS.

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4330 11235 4291 11225 4263 11233 4223 11329
      4251 11322 4290 11332
TIME...MOT...LOC 2254Z 240DEG 35KT 4286 11318 4256 11310
          4237 11315

$$

JKEYES
3 follow-up statements
318 
WWUS55 KPIH 012324
SVSPIH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
524 PM MDT SAT SEP 1 2012

IDC013-012332-
/O.CAN.KPIH.SV.W.0013.000000T0000Z-120902T0000Z/
BLAINE ID-
524 PM MDT SAT SEP 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BLAINE COUNTY IS
CANCELLED...

AT 522 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED OR MOVED OUT
OF THE AREA. THEREFORE THE WARNING IS CANCELLED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4225 11328 4251 11322 4298 11304 4330 11235
      4291 11225 4263 11233
TIME...MOT...LOC 2322Z 240DEG 35KT 4299 11286 4269 11278
          4250 11283

$$

IDC005-011-031-077-020000-
/O.CON.KPIH.SV.W.0013.000000T0000Z-120902T0000Z/
BINGHAM ID-POWER ID-CASSIA ID-BANNOCK ID-
524 PM MDT SAT SEP 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR NORTHWESTERN BANNOCK...NORTHEASTERN CASSIA...POWER AND
SOUTHWESTERN BINGHAM COUNTIES...

AT 519 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING
WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
EXTENDING FROM ABERDEEN TO NEELEY TO 6 MILES SOUTH OF ROCKLAND...OR
ALONG A LINE EXTENDING FROM ABERDEEN TO 7 MILES SOUTH OF AMERICAN
FALLS TO 20 MILES SOUTH OF AMERICAN FALLS...MOVING NORTHEAST AT 40
MPH.

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
  AMERICAN FALLS...
  ROCKLAND...
  ABERDEEN...
  FORT HALL BANNOCK CREEK LODGE...
  FORT HALL CITY...
  POCATELLO...
  CHUBBUCK...

VERY HEAVY RAIN IS ALSO POSSIBLE WITH THESE STORMS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE 
IMMEDIATELY FOR DAMAGING WINDS AND DEADLY CLOUD TO GROUND LIGHTNING. 
PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...PREFERABLY INSIDE A STRONG 
BUILDING BUT AWAY FROM WINDOWS.

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4225 11328 4251 11322 4298 11304 4330 11235
      4291 11225 4263 11233
TIME...MOT...LOC 2322Z 240DEG 35KT 4299 11286 4269 11278
          4250 11283

$$

JKEYES
672 
WWUS55 KPIH 012341
SVSPIH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
541 PM MDT SAT SEP 1 2012

IDC031-012351-
/O.CAN.KPIH.SV.W.0013.000000T0000Z-120902T0000Z/
CASSIA ID-
541 PM MDT SAT SEP 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CASSIA COUNTY IS
CANCELLED...

AT 541 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED OR MOVED OUT
OF THE AREA. THEREFORE THE WARNING IS CANCELLED.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4298 11305 4330 11235 4291 11225 4263 11233
      4236 11299
TIME...MOT...LOC 2341Z 240DEG 35KT 4308 11264 4278 11256
          4259 11261

$$

IDC005-011-077-020000-
/O.CON.KPIH.SV.W.0013.000000T0000Z-120902T0000Z/
BINGHAM ID-POWER ID-BANNOCK ID-
541 PM MDT SAT SEP 1 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR NORTHWESTERN BANNOCK...POWER AND SOUTHWESTERN BINGHAM COUNTIES...

AT 537 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING UP TO 
QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE 
STORMS WERE LOCATED ALONG A LINE EXTENDING FROM SPRINGFIELD TO FORT 
HALL BANNOCK CREEK LODGE TO FORT HALL BANNOCK PEAK...OR ALONG A LINE 
EXTENDING FROM 11 MILES NORTHEAST OF ABERDEEN TO 11 MILES SOUTHWEST 
OF POCATELLO TO 18 MILES SOUTHEAST OF AMERICAN FALLS...MOVING 
NORTHEAST AT 40 MPH.

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
   ROCKFORD... 
   FORT HALL BUFFALO LODGE... 
   POCATELLO AND  CHUBBUCK...   
   FORT HALL EAGLE LODGE AND  FORT HALL CITY...
   PORTNEUF GAP... MORELAND... BLACKFOOT AND  FORT HALL PUTNAM    
LODGE...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4298 11305 4330 11235 4291 11225 4263 11233
      4236 11299
TIME...MOT...LOC 2341Z 240DEG 35KT 4308 11264 4278 11256
          4259 11261

$$

JKEYES
742 
WWUS55 KPIH 012357
SVSPIH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
557 PM MDT SAT SEP 1 2012

IDC005-011-077-020005-
/O.EXP.KPIH.SV.W.0013.000000T0000Z-120902T0000Z/
BINGHAM ID-POWER ID-BANNOCK ID-
557 PM MDT SAT SEP 1 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BANNOCK...POWER
AND SOUTHWESTERN BINGHAM COUNTIES WILL EXPIRE AT 600 PM MDT...

AT 555 PM MDT...WEATHER SERVICE DOPPLER RADAR INDICATED THAT THE
THUNDERSTORMS WHICH PROMPTED THE WARNING HAVE WEAKENED OR MOVED OUT 
OF THE AREA. THEREFORE THE WARNING HAS BEEN ALLOWED TO EXPIRE. WINDS 
UP TO 55 MPH...HEAVY RAIN AND SMALL HAIL ALONG WITH LIGHTNING IS 
STILL POSSIBLE WITH THIS LINE OF STORMS. 

* LOCATIONS THAT COULD BE AFFECTED INCLUDE...
   POCATELLO...
   BLACKFOOT...
   FORT HALL CITY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

STAY TUNED TO THIS BROADCAST FOR THE LATEST UPDATES AND INFORMATION.
TO REPORT SEVERE WEATHER ONLY...CALL 1 800 8 7 7 1 9 3 7.

&&

LAT...LON 4298 11305 4330 11235 4291 11225 4263 11233
      4236 11299
TIME...MOT...LOC 2355Z 240DEG 35KT 4315 11247 4285 11240
          4266 11245

$$

JKEYES

The office that day

Everything else NWS Pocatello, ID issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 31, 6:04 PM MDTSpecial Weather StatementPIHMinidoka56 min
Aug 31, 6:08 PM MDTSpecial Weather StatementPIHCassia67 min
Aug 31, 6:56 PM MDTSpecial Weather StatementPIHCassia64 min
Aug 31, 6:57 PM MDTSpecial Weather StatementPIHPower63 min
Aug 31, 7:08 PM MDTSpecial Weather StatementPIHMadison52 min
Aug 31, 7:48 PM MDTSpecial Weather StatementPIHMadison42 min
Aug 31, 7:55 PM MDTSpecial Weather StatementPIHButte65 min
Aug 31, 8:02 PM MDTSpecial Weather StatementPIHCassia, Minidoka, Power88 min
Aug 31, 8:31 PM MDTSpecial Weather StatementPIHJefferson59 min
Aug 31, 8:48 PM MDTSpecial Weather StatementPIHCassia42 min
Aug 31, 9:14 PM MDTSpecial Weather StatementPIHCassia46 min
Aug 31, 9:23 PM MDTSpecial Weather StatementPIHJefferson67 min
Aug 31, 9:57 PM MDTSevere Thunderstorm WarningPIHBlaine, Cassia, Lincoln, Minidoka, Oneida, Power48 min
Aug 31, 10:45 PM MDTSpecial Weather StatementPIHBannock, Franklin, Oneida, Power45 min
Sep 1, 1:18 PM MDTRed Flag WarningPIHBannock, Bear Lake, Bingham, Bonneville, Butte, Caribou and 10 more9 hr
Sep 1, 3:06 PM MDTSpecial Weather StatementPIHFranklin54 min
Sep 1, 3:19 PM MDTSevere Thunderstorm WarningPIHCassia, Minidoka41 min
Sep 1, 3:28 PM MDTTornado WarningPIHCassia, Minidoka47 min
Sep 1, 4:10 PM MDTTornado WarningPIHBlaine, Cassia, Minidoka, Power50 min
Sep 1, 5:17 PM MDTSpecial Weather StatementPIHClark43 min
Sep 1, 5:49 PM MDTFlash Flood WarningPIHBannock, Power116 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2012Every severe thunderstorm warning in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.