Alert archive / Idaho / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 23, NWS Pocatello, ID

October 7, 2021Cassia County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Oct 7, 2021, 3:54 PM MDT for Cassia County, Idaho. It was in force for 51 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: Oct 7, 2021, 3:54 PM MDT (21:54 UTC)
Expired: Oct 7, 2021, 4:45 PM MDT
In force: 51 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Cassia County, ID

The radar

The Pocatello radar (KSFX), 102 km from the middle of the area, began a volume at 21:55 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

Time	Report	Where	Remark
Oct 7, 4:00 PM MDT	TSTM WND DMG	6 Ssw Albion, ID	NUMEROUS BIRCH TREES AROUND 4-6 INCH DIAMETER UPROOTED AND SNAPPED. DAMAGE APPEARS TO BE CONSISTENT WITH SIGNIFICANT STRAIGTLINE WINDS ASSOCIATED WITH THE REAR FLANK DOWNDRAFT.
Oct 7, 4:00 PM MDT	HAIL 1	3 Se Albion, ID	HAIL AROUND ONE INCH ACCUMULATED TO A DEPTH OF A FEW INCHES ACROSS THE ROADWAY AND SURROUNDING FIELDS ALONG AND AROUND I-77.

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

The nearest sounding before it

Elko, NV (KLKN), launched 12:00Z, 9.9 hours before the alert went out and 180 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: 3 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 927 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: -9 m²/s²
0-3 km storm-relative helicity: 134 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

392 
WUUS55 KPIH 072154
SVRPIH
IDC031-072245-
/O.NEW.KPIH.SV.W.0023.211007T2154Z-211007T2245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
354 PM MDT Thu Oct 7 2021

The National Weather Service in Pocatello has issued a

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

* Until 445 PM MDT.

* At 354 PM MDT, a severe thunderstorm was located near Albion, or 13
  miles west of Malta, moving east at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Malta, Albion, Sublett Reservoir, Mt Harrison, Yale Rest Area and
  Idahome.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4228 11372 4247 11380 4258 11302 4232 11301
TIME...MOT...LOC 2154Z 260DEG 32KT 4237 11362 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JKeyes

2 follow-up statements

798 
WWUS55 KPIH 072212
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
412 PM MDT Thu Oct 7 2021

IDC031-072245-
/O.CON.KPIH.SV.W.0023.000000T0000Z-211007T2245Z/
Cassia ID-
412 PM MDT Thu Oct 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM MDT
FOR EAST CENTRAL CASSIA COUNTY...

At 412 PM MDT, a severe thunderstorm was located near Albion, or 8
miles northwest of Malta, moving east at 30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Malta, Albion, Sublett Reservoir, Yale Rest Area and Idahome. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4231 11360 4247 11364 4258 11302 4232 11301
TIME...MOT...LOC 2212Z 260DEG 25KT 4239 11349 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JKeyes

907 
WWUS55 KPIH 072243
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
443 PM MDT Thu Oct 7 2021

IDC031-072252-
/O.EXP.KPIH.SV.W.0023.000000T0000Z-211007T2245Z/
Cassia ID-
443 PM MDT Thu Oct 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL CASSIA COUNTY
WILL EXPIRE AT 445 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A NEW Severe Thunderstorm Warning still remains in effect for South 
Central Power and East Central Cassia Counties until 515PM MDT.

LAT...LON 4231 11360 4247 11364 4258 11302 4232 11301
TIME...MOT...LOC 2242Z 260DEG 32KT 4243 11316 

$$

JKeyes

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 7, 1:36 PM MDT	Special Weather Statement	PIH	Bannock	24 min
Oct 7, 2:02 PM MDT	Special Weather Statement	PIH	Bannock	28 min
Oct 7, 2:04 PM MDT	Flash Flood Watch	PIH	Bear Lake, Caribou, Cassia, Franklin, Oneida	33 hr
Oct 7, 2:35 PM MDT	Severe Thunderstorm Warning	PIH	Cassia	25 min
Oct 7, 2:40 PM MDT	Flash Flood Warning	PIH	Cassia	2 hr
Oct 7, 3:00 PM MDT	Special Weather Statement	PIH	Cassia	45 min
Oct 7, 4:41 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Power	34 min
Oct 7, 5:14 PM MDT	Severe Thunderstorm Warning	PIH	Cassia, Power	31 min
Oct 7, 5:44 PM MDT	Special Weather Statement	PIH	Power	31 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.