Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 100, NWS Salt Lake City, UT

September 10, 2021Uinta County, Wyoming

NWS Salt Lake City, UT issued this severe thunderstorm warning at Sep 10, 2021, 1:46 PM MDT for Uinta County, Wyoming. It was in force for 44 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: Sep 10, 2021, 1:46 PM MDT (19:46 UTC)
Expired: Sep 10, 2021, 2:30 PM MDT
In force: 44 min
Issued by: NWS Salt Lake City, UT
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Uinta County, WY

The radar

The Salt Lake City radar (KMTX), 143 km from the middle of the area, began a volume at 19:48 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, 7.8 hours before the alert went out and 116 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 3445 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 33 m²/s²
0-3 km storm-relative helicity: 42 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

085 
WUUS55 KSLC 101946
SVRSLC
WYC041-102030-
/O.NEW.KSLC.SV.W.0100.210910T1946Z-210910T2030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Salt Lake City UT
146 PM MDT Fri Sep 10 2021

The National Weather Service in Salt Lake City has issued a

* Severe Thunderstorm Warning for...
  Northern Uinta County in southwestern Wyoming...

* Until 230 PM MDT

* At 145 PM MDT, a severe thunderstorm was located over Evanston, 
  moving northeast at 45 mph. A wind gust to 60 mph was reported 
  with this storm in Evanston. 

  HAZARD...60 mph wind gusts. 

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* Locations impacted include...
  Evanston, Ragen, Almy, Carter, Leroy and Fort Bridger. 

This includes Interstate 80 in Wyoming between mile markers 1 and 45.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4112 11104 4135 11105 4158 11074 4157 11037
      4137 11020
TIME...MOT...LOC 1945Z 240DEG 38KT 4127 11096 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

CRK

2 follow-up statements

726 
WWUS55 KSLC 102005
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
205 PM MDT Fri Sep 10 2021

WYC041-102030-
/O.CON.KSLC.SV.W.0100.000000T0000Z-210910T2030Z/
Uinta WY-
205 PM MDT Fri Sep 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM MDT
FOR NORTHERN UINTA COUNTY...

At 204 PM MDT, a severe thunderstorm was located 14 miles northeast
of Evanston, moving northeast at 45 mph.

HAZARD...60 mph wind gusts. 

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

Locations impacted include...
Evanston, Ragen, Fort Bridger, Almy, Altamont, Carter and Leroy. 

This includes Interstate 80 in Wyoming between mile markers 5 and 45.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4117 11086 4135 11105 4158 11074 4157 11037
      4137 11020
TIME...MOT...LOC 2004Z 240DEG 38KT 4137 11072 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...60 MPH

$$

Webber

585 
WWUS55 KSLC 102027
SVSSLC

Severe Weather Statement
National Weather Service Salt Lake City UT
227 PM MDT Fri Sep 10 2021

WYC041-102036-
/O.EXP.KSLC.SV.W.0100.000000T0000Z-210910T2030Z/
Uinta WY-
227 PM MDT Fri Sep 10 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN UINTA COUNTY WILL
EXPIRE AT 230 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.

LAT...LON 4117 11086 4135 11105 4158 11074 4157 11037
      4137 11020
TIME...MOT...LOC 2026Z 240DEG 38KT 4148 11046 

$$

Webber

The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 10, 1:42 PM MDT	Special Weather Statement	SLC	Uinta	48 min
Sep 10, 2:48 PM MDT	Special Weather Statement	SLC	Uinta	42 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 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.