Alert archive / Idaho / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 7, NWS Pocatello, ID

July 13, 2021Fremont County, Teton County, Idaho

NWS Pocatello, ID issued this severe thunderstorm warning at Jul 13, 2021, 5:56 PM MDT for Fremont County, Teton County, Idaho. It was in force for 28 min. 1 report 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: Jul 13, 2021, 5:56 PM MDT (23:56 UTC)
Expired: Jul 13, 2021, 6:24 PM MDT
In force: 28 min
Issued by: NWS Pocatello, ID
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Fremont County, ID, Teton County, ID

The radar

The Pocatello radar (KSFX), 156 km from the middle of the area, began a volume at 23:56 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

Time	Report	Where	Remark
Jul 13, 5:56 PM MDT	HAIL 1	1 E Ashton, ID	DIME TO QUARTER SIZE HAIL REPORTED.

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

The nearest sounding before it

Riverton, WY (KRIW), launched 12:00Z, 11.9 hours before the alert went out and 258 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: 6 J/kg
Mixed-layer CIN: -485 J/kg
Mixed-layer LCL: 2257 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 212 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

381 
WUUS55 KPIH 132356
SVRPIH
IDC043-081-140045-
/O.NEW.KPIH.SV.W.0007.210713T2356Z-210714T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Pocatello ID
556 PM MDT Tue Jul 13 2021

The National Weather Service in Pocatello has issued a

* Severe Thunderstorm Warning for...
  Northeastern Teton County in eastern Idaho...
  Southeastern Fremont County in southeastern Idaho...

* Until 645 PM MDT.

* At 553 PM MDT, a severe thunderstorm was located near Marysville,
  moving east at 15 to 20 mph.

  HAZARD...Quarter size hail, winds of 30 to 40 mph and brief 
           moderate rain.

  SOURCE...Storm spotter reported quarter size hail.

  IMPACT...Damage to vehicles and crops are expected.

* Locations impacted include...
  Ashton, Marysville and Warm River. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection seek shelter. 

&&

LAT...LON 4405 11145 4414 11142 4417 11105 4394 11105
TIME...MOT...LOC 2353Z 278DEG 19KT 4408 11133 

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

TW

1 follow-up statement

246 
WWUS55 KPIH 140024
SVSPIH

Severe Weather Statement
National Weather Service Pocatello ID
624 PM MDT Tue Jul 13 2021

IDC043-081-140034-
/O.CAN.KPIH.SV.W.0007.000000T0000Z-210714T0045Z/
Teton ID-Fremont ID-
624 PM MDT Tue Jul 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN TETON AND
SOUTHEASTERN FREMONT COUNTIES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

LAT...LON 4405 11145 4414 11142 4417 11105 4394 11105
TIME...MOT...LOC 0018Z 278DEG 19KT 4406 11111 

$$

TW

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 13, 1:05 AM MDT	Red Flag Warning	PIH	Bannock, Bear Lake, Bingham, Blaine, Boise, Bonneville and 16 more	21 hr
Jul 13, 2:15 AM MDT	Lake Wind Advisory	PIH	Bannock, Bingham, Power	19 hr
Jul 13, 5:48 PM MDT	Special Weather Statement	PIH	Fremont	42 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.