Alert archive / Idaho / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Pocatello, ID

July 22, 2021Cassia County, Oneida County, Power County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 22, 2021, 2:37 PM MDT for Cassia County, Oneida County, Power County, Idaho. It was in force for 38 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: Jul 22, 2021, 2:37 PM MDT (20:37 UTC)
Expired: Jul 22, 2021, 3:15 PM MDT
In force: 38 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Cassia County, ID, Oneida County, ID, Power County, ID

The radar

The Salt Lake City radar (KMTX), 104 km from the middle of the area, began a volume at 20:40 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.

The nearest sounding before it

Salt Lake City I, UT (KSLC), launched 12:00Z, 8.6 hours before the alert went out and 171 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: 56 J/kg
Mixed-layer CIN: -151 J/kg
Mixed-layer LCL: 2355 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 21 m²/s²
0-3 km storm-relative helicity: 40 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

686 
WUUS55 KPIH 222037
SVRPIH
IDC031-071-077-222115-
/O.NEW.KPIH.SV.W.0012.210722T2037Z-210722T2115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
237 PM MDT Thu Jul 22 2021

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Western Oneida County in southeastern Idaho...
  South central Power County in southeastern Idaho...
  Southeastern Cassia County in southeastern Idaho...

* Until 315 PM MDT.

* At 236 PM MDT, a severe thunderstorm was located 8 miles west of
  Holbrook Summit, or 15 miles north of Snowville, moving east at 20
  MPH.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Holbrook Summit, Juniper, Holbrook and Sweetzer Summit. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

Continuous cloud to ground lightning is occurring with this storm. 
Move indoors immediately. Lightning is one of nature's leading 
killers. Remember, if you can hear thunder, you are close enough to 
be struck by lightning.

&&

LAT...LON 4204 11301 4220 11309 4243 11252 4210 11241
TIME...MOT...LOC 2036Z 251DEG 16KT 4218 11282 

HAIL...1.25IN
WIND...60MPH
 
$$

KSmith

2 follow-up statements

291 
WWUS55 KPIH 222051
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
251 PM MDT Thu Jul 22 2021

IDC031-222100-
/O.CAN.KPIH.SV.W.0012.000000T0000Z-210722T2115Z/
Cassia ID-
251 PM MDT Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CASSIA COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved east of 
the warned area. Therefore, the warning has been cancelled.

If you observed hail or wind damage, please report your observations 
to the National Weather Service in Pocatello via social media, or by 
calling 208-233-0834.

LAT...LON 4207 11278 4223 11294 4243 11252 4210 11241
TIME...MOT...LOC 2050Z 251DEG 16KT 4220 11274 

$$

IDC071-077-222115-
/O.CON.KPIH.SV.W.0012.000000T0000Z-210722T2115Z/
Oneida ID-Power ID-
251 PM MDT Thu Jul 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 315 PM MDT
FOR CENTRAL ONEIDA AND SOUTH CENTRAL POWER COUNTIES...

At 250 PM MDT, a severe thunderstorm was located near Holbrook
Summit, or 16 miles north of Snowville, moving east at 20 MPH.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Holbrook Summit and Holbrook. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 4207 11278 4223 11294 4243 11252 4210 11241
TIME...MOT...LOC 2050Z 251DEG 16KT 4220 11274 

HAIL...1.25IN
WIND...60MPH
 
$$

KSmith

437 
WWUS55 KPIH 222112
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
312 PM MDT Thu Jul 22 2021

IDC071-077-222122-
/O.EXP.KPIH.SV.W.0012.000000T0000Z-210722T2115Z/
Oneida ID-Power ID-
312 PM MDT Thu Jul 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL ONEIDA AND SOUTH
CENTRAL POWER COUNTIES WILL EXPIRE AT 315 PM MDT...
                
The storm which prompted the warning has 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 this 
thunderstorm.

LAT...LON 4207 11278 4223 11294 4243 11252 4210 11241
TIME...MOT...LOC 2112Z 251DEG 16KT 4223 11264 

$$

KSmith

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 6:31 PM MDT	Special Weather Statement	PIH	Cassia	59 min
Jul 21, 7:55 PM MDT	Special Weather Statement	PIH	Cassia	50 min
Jul 21, 8:10 PM MDT	Special Weather Statement	PIH	Bingham	65 min
Jul 21, 9:46 PM MDT	Special Weather Statement	PIH	Bingham, Power	59 min
Jul 22, 2:00 AM MDT	Red Flag Warning	PIH	Bannock, Bear Lake, Bonneville, Butte, Caribou, Cassia and 12 more	19 hr
Jul 22, 10:36 AM MDT	Special Weather Statement	PIH	Power	39 min
Jul 22, 1:46 PM MDT	Special Weather Statement	PIH	Oneida	59 min
Jul 22, 3:07 PM MDT	Special Weather Statement	PIH	Oneida	38 min
Jul 22, 3:11 PM MDT	Special Weather Statement	PIH	Oneida	34 min
Jul 22, 3:18 PM MDT	Special Weather Statement	PIH	Bonneville	12 min
Jul 22, 3:24 PM MDT	Special Weather Statement	PIH	Cassia	36 min
Jul 22, 3:39 PM MDT	Special Weather Statement	PIH	Bannock	51 min
Jul 22, 3:50 PM MDT	Special Weather Statement	PIH	Oneida	55 min
Jul 22, 4:09 PM MDT	Special Weather Statement	PIH	Power	51 min
Jul 22, 4:45 PM MDT	Special Weather Statement	PIH	Oneida, Power	60 min
Jul 22, 5:07 PM MDT	Special Weather Statement	PIH	Caribou	53 min
Jul 22, 5:14 PM MDT	Special Weather Statement	PIH	Franklin	46 min
Jul 22, 5:47 PM MDT	Special Weather Statement	PIH	Bear Lake, Caribou, Franklin	88 min

Nearby

Severe Thunderstorm Warnings in Idaho, 2021 Every severe thunderstorm warning in 2021

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.