Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 51, NWS Cheyenne, WY

June 13, 2021Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 13, 2021, 5:43 PM MDT for Laramie County, Wyoming. It was in force for 41 min. 3 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: Jun 13, 2021, 5:43 PM MDT (23:43 UTC)
Expired: Jun 13, 2021, 6:24 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 26 km from the middle of the area, began a volume at 23:45 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
Jun 13, 6:10 PM MDT	HAIL 1	8 Wsw Burns, WY	DELAYED REPORT.
Jun 13, 6:17 PM MDT	HAIL 1.75	20 Ese Cheyenne, WY	REPORT RECEIVED VIA FACEBOOK.
Jun 13, 6:20 PM MDT	HAIL 1.75	5 Sw Hillsdale, WY

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

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 13, 3:04 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 11.7 hours before the alert went out and 173 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: 827 J/kg
Mixed-layer CIN: -387 J/kg
Mixed-layer LCL: 1858 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 10 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

092 
WUUS55 KCYS 132343
SVRCYS
WYC021-140045-
/O.NEW.KCYS.SV.W.0051.210613T2343Z-210614T0045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
543 PM MDT Sun Jun 13 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Southeastern Laramie County in southeastern Wyoming...

* Until 645 PM MDT.

* At 542 PM MDT, a severe thunderstorm was located 8 miles west of
  Carpenter, or 16 miles southeast of Cheyenne, and is nearly
  stationary.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Carpenter around 645 PM MDT.

This includes Interstate 80 in Wyoming between mile markers 369 and
391.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4100 10468 4120 10469 4121 10426 4100 10421
TIME...MOT...LOC 2342Z 233DEG 3KT 4103 10450 

HAIL...1.25IN
WIND...<50MPH
 
$$

Rubin

2 follow-up statements

910 
WWUS55 KCYS 140001
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
601 PM MDT Sun Jun 13 2021

WYC021-140045-
/O.CON.KCYS.SV.W.0051.000000T0000Z-210614T0045Z/
Laramie WY-
601 PM MDT Sun Jun 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM MDT
FOR SOUTHEASTERN LARAMIE COUNTY...

At 601 PM MDT, a severe thunderstorm was located 7 miles west of
Carpenter, or 17 miles southeast of Cheyenne, and is nearly
stationary.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe storm will be near...
  Carpenter around 615 PM MDT.

This includes Interstate 80 in Wyoming between mile markers 369 and
391.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4100 10468 4120 10469 4121 10426 4100 10421
TIME...MOT...LOC 0001Z 233DEG 3KT 4104 10448 

HAIL...1.25IN
WIND...<50MPH
 
$$

Rubin

008 
WWUS55 KCYS 140024
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
624 PM MDT Sun Jun 13 2021

WYC021-140034-
/O.CAN.KCYS.SV.W.0051.000000T0000Z-210614T0045Z/
Laramie WY-
624 PM MDT Sun Jun 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LARAMIE COUNTY 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.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for 
portions of southeastern Wyoming.

LAT...LON 4100 10468 4120 10469 4121 10426 4100 10421
TIME...MOT...LOC 0021Z 233DEG 3KT 4105 10446 

$$

Rubin

The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 13, 1:49 PM MDT	Special Weather Statement	CYS	Laramie	41 min
Jun 13, 2:44 PM MDT	Special Weather Statement	CYS	Albany	31 min
Jun 13, 3:12 PM MDT	Special Weather Statement	CYS	Albany	33 min
Jun 13, 3:31 PM MDT	Special Weather Statement	CYS	Platte	29 min
Jun 13, 3:57 PM MDT	Special Weather Statement	CYS	Goshen	33 min
Jun 13, 4:31 PM MDT	Special Weather Statement	CYS	Goshen	29 min
Jun 13, 4:53 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	32 min
Jun 13, 4:58 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	47 min
Jun 13, 5:13 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jun 13, 5:16 PM MDT	Special Weather Statement	CYS	Laramie	44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.