Alert archive / Idaho / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 2, NWS Pocatello, ID

June 4, 2021Cassia County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jun 4, 2021, 3:40 PM MDT for Cassia County, Idaho. It was in force for 22 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: Jun 4, 2021, 3:40 PM MDT (21:40 UTC)
Expired: Jun 4, 2021, 4:02 PM MDT
In force: 22 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

County Cassia County, ID

The radar

The Pocatello radar (KSFX), 147 km from the middle of the area, began a volume at 21:40 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

Elko, NV (KLKN), launched 12:00Z, 9.7 hours before the alert went out and 139 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: 2 J/kg
Mixed-layer CIN: -432 J/kg
Mixed-layer LCL: 2741 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 34 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

598 
WUUS55 KPIH 042140
SVRPIH
IDC031-042230-
/O.NEW.KPIH.SV.W.0002.210604T2140Z-210604T2230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
340 PM MDT Fri Jun 4 2021

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Southwestern Cassia County in southeastern Idaho...

* Until 430 PM MDT.

* At 340 PM MDT, a severe thunderstorm was located southeast of 
  Oakley Reservoir, moving east at 25 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Oakley Reservoir, Almo, Elba, Mt Harrison and City Of Rocks. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Large hail and damaging winds and 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 4199 11401 4212 11409 4237 11358 4210 11342
      4199 11392
TIME...MOT...LOC 2140Z 248DEG 22KT 4209 11395 

HAIL...1.00IN
WIND...<50MPH
 
$$

Huston

1 follow-up statement

771 
WWUS55 KPIH 042202
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
402 PM MDT Fri Jun 4 2021

IDC031-042212-
/O.CAN.KPIH.SV.W.0002.000000T0000Z-210604T2230Z/
Cassia ID-
402 PM MDT Fri Jun 4 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CASSIA COUNTY IS
CANCELLED...
                
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 has been cancelled.  However gusty winds and
heavy rain are still possible with this thunderstorm.

LAT...LON 4199 11401 4212 11409 4237 11358 4210 11342
      4199 11392
TIME...MOT...LOC 2154Z 248DEG 22KT 4214 11378 

$$

Huston

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 4, 1:25 PM MDT	Lake Wind Advisory	PIH	Bannock, Bingham, Power	32 hr
Jun 4, 2:39 PM MDT	Special Weather Statement	PIH	Clark	51 min
Jun 4, 3:11 PM MDT	Special Weather Statement	PIH	Cassia	49 min
Jun 4, 3:51 PM MDT	Special Weather Statement	PIH	Clark	39 min
Jun 4, 3:59 PM MDT	Severe Thunderstorm Warning	PIH	Clark	46 min
Jun 4, 4:10 PM MDT	Special Weather Statement	PIH	Cassia	50 min
Jun 4, 4:25 PM MDT	Special Weather Statement	PIH	Cassia	50 min
Jun 4, 4:38 PM MDT	Severe Thunderstorm Warning	PIH	Cassia	52 min
Jun 4, 4:54 PM MDT	Special Weather Statement	PIH	Clark	51 min
Jun 4, 5:16 PM MDT	Special Weather Statement	PIH	Fremont	59 min
Jun 4, 5:25 PM MDT	Special Weather Statement	PIH	Oneida	65 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.