Alert archive / Idaho / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 76, NWS Pocatello, ID

August 5, 20156 counties in Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Aug 5, 2015, 3:24 PM MDT for 6 counties in Idaho. It was in force for 51 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 5, 2015, 3:24 PM MDT (21:24 UTC)
Expired: Aug 5, 2015, 4:15 PM MDT
In force: 51 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon

Counties Bonneville County, ID, Clark County, ID, Fremont County, ID, Jefferson County, ID, Madison County, ID, Teton County, ID

The radar

The Pocatello radar (KSFX), 97 km from the middle of the area, began a volume at 21:23 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 5, 1:37 PM MDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 9.4 hours before the alert went out and 283 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 31 J/kg
Mixed-layer CIN: -286 J/kg
Mixed-layer LCL: 1999 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 81 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

099 
WUUS55 KPIH 052124
SVRPIH
IDC019-033-043-051-065-081-052215-
/O.NEW.KPIH.SV.W.0076.150805T2124Z-150805T2215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE POCATELLO ID
324 PM MDT WED AUG 5 2015

THE NATIONAL WEATHER SERVICE IN POCATELLO HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  JEFFERSON COUNTY IN SOUTHEASTERN IDAHO...
  SOUTHEASTERN CLARK COUNTY IN EASTERN IDAHO...
  SOUTHERN FREMONT COUNTY IN SOUTH CENTRAL IDAHO...
  NORTHEASTERN BONNEVILLE COUNTY IN SOUTHEASTERN IDAHO...
  MADISON COUNTY IN SOUTHEASTERN IDAHO...
  TETON COUNTY IN EASTERN IDAHO...

* UNTIL 415 PM MDT

* AT 324 PM MDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
  THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE HAIL AND DAMAGING
  WINDS IN EXCESS OF 60 MPH. THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 6 MILES SOUTHWEST OF HAMER TO ARCHER TO 12 MILES
  WEST OF SWAN VALLEY...AND MOVING NORTHEAST AT 45 MPH.

* LOCATIONS IMPACTED INCLUDE...
  IDAHO FALLS...REXBURG...RIGBY...DRIGGS...ASHTON...SWAN VALLEY...
  FELT...TERRETON...RIRIE RESERVOIR...MARYSVILLE...LORENZO...AMMON...
  VICTOR...IONA...SUGAR CITY...UCON...MENAN...TETON...RIRIE AND
  ROBERTS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DEADLY LIGHTNING AND 
VERY HEAVY RAIN. FOR YOUR PROTECTION...MOVE TO AN INTERIOR ROOM ON 
THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS 
QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.

DOPPLER RADAR HAS INDICATED SOME WEAK ROTATION WITHIN THESE STORMS.
ALTHOUGH A TORNADO IS NOT IMMEDIATELY LIKELY...IF ONE IS SPOTTED...
ACT QUICKLY AND MOVE TO A PLACE OF SAFETY IN A STURDY STRUCTURE...
SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4329 11157 4350 11217 4377 11261 4378 11260
      4428 11172 4406 11106 4350 11104
TIME...MOT...LOC 2124Z 233DEG 39KT 4384 11226 4370 11180 4337 11154 

$$

JKEYES

2 follow-up statements

913 
WWUS55 KPIH 052149
SVSPIH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
349 PM MDT WED AUG 5 2015

IDC019-033-043-051-065-081-052215-
/O.CON.KPIH.SV.W.0076.000000T0000Z-150805T2215Z/
JEFFERSON ID-CLARK ID-FREMONT ID-BONNEVILLE ID-MADISON ID-TETON ID-
349 PM MDT WED AUG 5 2015

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM MDT
FOR EASTERN JEFFERSON...SOUTHEASTERN CLARK...SOUTHERN FREMONT...
NORTHEASTERN BONNEVILLE...MADISON AND TETON COUNTIES...

AT 348 PM MDT...DOPPLER RADAR INDICATED A LINE OF SEVERE
THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN EXCESS OF 60
MPH. THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 8 MILES
NORTHWEST OF EGIN TO 7 MILES EAST OF TETON TO NEAR SWAN VALLEY...
MOVING NORTHEAST AT 45 MPH.

LOCATIONS IMPACTED INCLUDE...
REXBURG...RIGBY...DRIGGS...ASHTON...SWAN VALLEY...FELT...
MARYSVILLE...LORENZO...RIRIE RESERVOIR...VICTOR...SUGAR CITY...
MENAN...TETON...RIRIE...PARKER...TETONIA...IRWIN...HAMER...DRUMMOND
AND EGIN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...DESTRUCTIVE HAIL...
DEADLY LIGHTNING AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN
INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY
RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE INTO AREAS WHERE WATER
COVERS THE ROAD.

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY
LEAD TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4336 11140 4360 11183 4386 11217 4394 11224
      4428 11172 4406 11106 4350 11104
TIME...MOT...LOC 2148Z 233DEG 39KT 4399 11199 4385 11153 4352 11127 

$$

JKEYES

214 
WWUS55 KPIH 052211
SVSPIH

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
411 PM MDT WED AUG 5 2015

IDC019-033-043-051-065-081-052221-
/O.EXP.KPIH.SV.W.0076.000000T0000Z-150805T2215Z/
JEFFERSON ID-CLARK ID-FREMONT ID-BONNEVILLE ID-MADISON ID-TETON ID-
411 PM MDT WED AUG 5 2015

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN JEFFERSON...
SOUTHEASTERN CLARK...SOUTHERN FREMONT...NORTHEASTERN BONNEVILLE...
MADISON AND TETON COUNTIES WILL EXPIRE AT 415 PM MDT...
            
THE STORMS WHICH PROMPTED THE WARNING HAVE WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
THEREFORE THE WARNING WILL BE ALLOWED TO EXPIRE. HOWEVER SMALL
HAIL...GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH THESE
THUNDERSTORMS.

LAT...LON 4336 11140 4360 11183 4386 11217 4394 11224
      4428 11172 4406 11106 4350 11104
TIME...MOT...LOC 2210Z 233DEG 39KT 4399 11199 4385 11153 4352 11127 

$$

JKEYES

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, 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 this severe thunderstorm warning went out at Aug 5, 12:49 PM MDT, 2 hours 35 minutes earlier.

Area forecast discussion, Aug 5, 12:49 PM MDT, 2 hours 35 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE POCATELLO ID
1249 PM MDT WED AUG 5 2015

.DISCUSSION...DISTURBANCE OVER NORTHERN NEVADA AND SOUTHWESTERN IDAHO
APPROACHING SOUTHEAST IDAHO THIS AFTERNOON AND EVENING. DISTURBANCE
HAS GOOD SUPPORT FOR VIGOROUS STORM DEVELOPMENT...INCLUDING WIND
GUSTS OF 50 TO 60 MPH AND HEAVY RAIN SHOWERS. FAVORED AREAS FOR
HEAVY SHOWERS INCLUDE THE SOUTH CENTRAL AND CARIBOU HIGHLANDS AND
PORTIONS OF THE CENTRAL MOUNTAINS....ALTHOUGH STORM CELLS COULD
EASILY CROSS THE SNAKE PLAIN. DISTURBANCE TRACKS TOWARDS ISLAND PARK
THROUGH ABOUT MIDNIGHT. THURSDAY WILL BE MOSTLY SUNNY DAY. THE NEXT
DISTURBANCE IS POSSIBLY APPROACHING A BIT QUICKER AND ARRIVING LATE
FRIDAY AFTERNOON THROUGH SATURDAY. POPS WERE INCREASE FOR THE
OVERNIGHT HOURS INTO EARLY SATURDAY MORNING AS A RESULT. NO
SIGNIFICANT CHANGES WERE MADE FOR SUNDAY THROUGH TUESDAY AS THIS
AREA REMAINS BETWEEN A TROUGH OF LOW PRESSURE OFF WASHINGTON AND
RIDGING TOWARD FOUR CORNERS AREA WITH SOME HINT OF MONSOON MOISTURE
SLIPING NORTH TO IDAHO. RS

&&

.AVIATION...SHOWERS AND STORMS SHOULD CLEAR EASTERN IDAHO A LITTLE
AFTER MIDNIGHT. UNTIL THEN...EXPECT ACTIVITY THAT COULD PRODUCE
WINDS OVER 50KTS AT TIMES ALONG WITH SMALL HAIL AND HEAVY RAIN. WE
COULD SEE REDUCED VISIBILITY IN RAIN OR BLOWING DUST AND CEILINGS
BRIEFLY DROPPING TO MVFR. TOMORROW WILL BE VFR WITH AFTERNOON WINDS
15-25KTS WITH HIGHER GUSTS.  KEYES

&&

.FIRE WEATHER...RED FLAG WARNINGS WILL REMAIN IN EFFECT AS NUMEROUS
SHOWERS AND THUNDERSTORM CONTINUE TO ROLL ACROSS EASTERN IDAHO. THE
THREAT FOR DOWNBURST WINDS OVER 60MPH HAS INCREASED TODAY BUT SO HAS
THE THREAT OF HAIL AND HEAVY RAIN WHICH COULD IMPACT CREWS OUT ON
ANY FIRES. WE QUICKLY CLEAR OUT OVERNIGHT AND WILL SEE A DRY BUT
BREEZY THURSDAY. WIND GUSTS OF 25-35MPH ARE FORECAST BUT WE SHOULD
NOT SEE RED FLAG CONDITIONS...AT LEAST WIDESPREAD...AS THE HUMIDITY
WILL NOT BE DROPPING THAT LOW. SHOWERS AND STORMS RETURN FOR FRIDAY
AFTERNOON AND THE WEEKEND. WE SHOULD SEE ANOTHER EVENT WITH A MIX OF
WET AND DRY STORMS ESPECIALLY FRIDAY. SATURDAY MAY ACTUALLY BE TOO
CLOUDY TO SPAWN ENOUGH LIGHTNING TO WARRANT RED FLAG WARNINGS...BE
WILL BE MONITORING TO SEE HOW THINGS EVOLVE. KEYES
&&

.PIH WATCHES/WARNINGS/ADVISORIES...
RED FLAG WARNING UNTIL 9 PM MDT THIS EVENING FOR IDZ410-413-425-
427.

&&

In the hours before

Local storm report, Aug 5, 2:58 PM MDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
258 PM MDT WED AUG 05 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0256 PM     TSTM WND GST     1 SSE BLACKFOOT         43.18N 112.34W
08/05/2015  E55.00 MPH       BINGHAM            ID   TRAINED SPOTTER

            ESTIMATED WIND GUST FROM THE SSW AT 55MPH WITH RAIN

&&

GWICKLUN

Local storm report, Aug 5, 2:59 PM MDT, 25 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
259 PM MDT WED AUG 05 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0257 PM     FLASH FLOOD      9 N BLACK PINE          42.15N 112.97W
08/05/2015                   ONEIDA             ID   TRAINED SPOTTER

            SPOTTER REPORTS ESTIMATED A GOOD HALF INCH RAIN FELL
            REALLY QUICKLY A FEW MINUTES AGO.WATER IS RUNNING THROUGH
            THE FILEDS. SOME PEA SIZE HAIL FELL AS WELL.

&&

RSURVICK

Local storm report, Aug 5, 3:06 PM MDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
306 PM MDT WED AUG 5 2015

...TIME...  ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
...DATE...  ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0304 PM     HAIL             IDAHO FALLS             43.49N 112.04W
08/05/2015  M0.75 INCH       BONNEVILLE         ID   PUBLIC

            DIME TO PENNY SIZE HAIL REPORTED IN IDAHO
            FALLS VIA OFFICE TWITTER ACCOUNT.

&&

JKEYES

Local storm report, Aug 5, 3:09 PM MDT, 15 minutes before

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE POCATELLO ID
309 PM MDT WED AUG 05 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0305 PM     HAIL             9 N BLACK PINE          42.15N 112.97W
08/05/2015  E0.25 INCH       ONEIDA             ID   TRAINED SPOTTER

            PEA-SIZE HAIL AND AN ESTIMATED 0.75 INCHES OF RAIN

&&

GWICKLUN

Local storm report, Aug 5, 3:15 PM MDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE POCATELLO ID
315 PM MDT WED AUG 05 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0314 PM     HAIL             6 NNE HOLBROOK          42.26N 112.62W
08/05/2015  E0.25 INCH       ONEIDA             ID   TRAINED SPOTTER

            PEA-SIZE HAIL AND HEAVY RAINFALL. STILL RAINING AT TIME
            OF REPORT.

&&

GWICKLUN

Special weather statement, Aug 5, 3:19 PM MDT, 5 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE POCATELLO ID
319 PM MDT WED AUG 5 2015

IDZ019-052200-
UPPER SNAKE HIGHLANDS ID-
319 PM MDT WED AUG 5 2015

...DIME SIZE HAIL AND WIND GUSTS UP TO 50 MPH AFFECTING SOUTHEASTERN
FREMONT...EAST CENTRAL MADISON AND NORTHERN TETON COUNTIES UNTIL 400
PM MDT...

AT 318 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 8
MILES WEST OF TETONIA. THIS STORM WAS NEARLY STATIONARY.

DIME SIZE HAIL...HEAVY RAIN AND WIND GUSTS UP TO 50 MPH WILL BE
POSSIBLE WITH THIS STORM.

LOCATIONS IMPACTED INCLUDE...
FELT...TETONIA...GREEN CANYON HOT SPRINGS AND TETONIA RESEARCH
STATION.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 900 PM MDT FOR
SOUTHEASTERN IDAHO.

LAT...LON 4369 11135 4379 11148 4407 11105 4377 11105
TIME...MOT...LOC 2118Z 180DEG 0KT 4379 11133

RS

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 4, 6:32 PM MDT	Special Weather Statement	PIH	Cassia	43 min
Aug 4, 7:00 PM MDT	Special Weather Statement	PIH	Bingham	45 min
Aug 4, 7:17 PM MDT	Special Weather Statement	PIH	Power	58 min
Aug 4, 7:44 PM MDT	Special Weather Statement	PIH	Power	46 min
Aug 4, 8:54 PM MDT	Special Weather Statement	PIH	Blaine	51 min
Aug 4, 9:44 PM MDT	Special Weather Statement	PIH	Blaine	46 min
Aug 4, 10:29 PM MDT	Special Weather Statement	PIH	Butte	46 min
Aug 4, 10:36 PM MDT	Special Weather Statement	PIH	Bingham	39 min
Aug 5, 12:38 PM MDT	Special Weather Statement	PIH	Lincoln, Minidoka	37 min
Aug 5, 1:16 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Blaine, Bonneville, Butte, Cassia and 3 more	44 min
Aug 5, 1:38 PM MDT	Special Weather Statement	PIH	Cassia	52 min
Aug 5, 1:57 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Blaine, Bonneville, Butte, Caribou and 2 more	48 min
Aug 5, 2:25 PM MDT	Flash Flood Warning	PIH	Cassia, Oneida	3 hr
Aug 5, 2:42 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Bingham, Bonneville, Butte, Caribou, Clark and 4 more	48 min
Aug 5, 2:43 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Oneida, Power	47 min
Aug 5, 3:19 PM MDT	Special Weather Statement	PIH	Teton	41 min
Aug 5, 3:19 PM MDT	Severe Thunderstorm Warning	PIH	Bannock, Oneida, Power	41 min
Aug 5, 3:27 PM MDT	Tornado Warning	PIH	Bonneville, Jefferson, Madison, Teton	48 min
Aug 5, 3:39 PM MDT	Special Weather Statement	PIH	Butte	51 min
Aug 5, 4:11 PM MDT	Special Weather Statement	PIH	Cassia	49 min
Aug 5, 4:18 PM MDT	Special Weather Statement	PIH	Fremont, Teton	42 min
Aug 5, 4:27 PM MDT	Special Weather Statement	PIH	Bear Lake, Franklin	48 min
Aug 5, 4:49 PM MDT	Special Weather Statement	PIH	Oneida	41 min
Aug 5, 5:02 PM MDT	Special Weather Statement	PIH	Cassia	43 min
Aug 5, 5:38 PM MDT	Special Weather Statement	PIH	Bear Lake, Franklin	67 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2015 Every severe thunderstorm warning in 2015

Sources

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