Alert archive / Idaho / Special Weather Statements in 2021

Special Weather Statement, NWS Pocatello, ID

August 21, 2021Jefferson County, Idaho

NWS Pocatello, ID issued this special weather statement at Aug 21, 2021, 10:01 PM MDT for Jefferson County, Idaho. It was in force for 29 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 21, 2021, 10:01 PM MDT (04:01 UTC)
Expired: Aug 21, 2021, 10:30 PM MDT
In force: 29 min
Issued by: NWS Pocatello, ID
Hail: 0.88 in
Wind: 50

County Jefferson County, ID

The radar

The Pocatello radar (KSFX), 77 km from the middle of the area, began a volume at 04:05 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

Boise Airport, ID (KBOI), launched 00:00Z, 4.0 hours before the alert went out and 307 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: 159 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 2118 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: -72 m²/s²
0-3 km storm-relative helicity: -4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.5

Open this sounding in Storm Lab

The text

As transmitted.

797 
WWUS85 KPIH 220401
SPSPIH

Special Weather Statement
National Weather Service Pocatello ID
1001 PM MDT Sat Aug 21 2021
 
IDZ052-053-220430-
Arco/Mud Lake Desert ID-Upper Snake River Plain ID-
1001 PM MDT Sat Aug 21 2021

...A strong thunderstorm will impact portions of western Jefferson,
northwestern Bonneville and northern Bingham Counties through 1030 PM
MDT...

At 1001 PM MDT, Doppler radar was tracking a strong thunderstorm 9
miles southwest of Terreton, moving northeast at 45 mph.

HAZARD...Wind gusts up to 50 mph and nickel size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
Terreton, Hamer and Sage Junction. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4362 11253 4370 11263 4402 11221 4384 11203
TIME...MOT...LOC 0401Z 231DEG 37KT 4370 11251 

MAX HAIL SIZE...0.88 IN
MAX WIND GUST...50 MPH

$$

McKaughan

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 21, 6:49 PM MDT	Special Weather Statement	PIH	Bear Lake	41 min
Aug 21, 9:55 PM MDT	Special Weather Statement	PIH	Cassia	50 min
Aug 21, 10:53 PM MDT	Special Weather Statement	PIH	Jefferson	37 min
Aug 21, 11:16 PM MDT	Special Weather Statement	PIH	Bannock, Oneida	59 min
Aug 21, 11:20 PM MDT	Special Weather Statement	PIH	Bingham, Bonneville	55 min
Aug 22, 12:20 AM MDT	Special Weather Statement	PIH	Bonneville, Caribou	55 min

Nearby

Special Weather Statements in Idaho, 2021 Every special weather statement 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.