Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 49, NWS Cheyenne, WY

June 13, 2021Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 13, 2021, 4:58 PM MDT for Laramie County, Wyoming. It was in force for 47 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: Jun 13, 2021, 4:58 PM MDT (22:58 UTC)
Expired: Jun 13, 2021, 5:45 PM MDT
In force: 47 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

County Laramie County, WY

The radar

The Cheyenne radar (KCYS), 53 km from the middle of the area, began a volume at 23:01 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, 5:14 PM MDT	HAIL 1	4 Ese Gun Barrel, 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, 11.0 hours before the alert went out and 191 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.

417 
WUUS55 KCYS 132258
SVRCYS
WYC021-132345-
/O.NEW.KCYS.SV.W.0049.210613T2258Z-210613T2345Z/

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

The National Weather Service in Cheyenne has issued a

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

* Until 545 PM MDT.

* At 457 PM MDT, a severe thunderstorm was located over Gun Barrel,
  or 32 miles northeast of Cheyenne, moving southeast at 20 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Albin, Gun Barrel and Meriden Rest Area. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4139 10443 4154 10433 4147 10405 4121 10406
TIME...MOT...LOC 2257Z 294DEG 16KT 4144 10430 

HAIL...1.75IN
WIND...60MPH
 
$$

Hammer

2 follow-up statements

642 
WWUS55 KCYS 132318
SVSCYS

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

WYC021-132345-
/O.CON.KCYS.SV.W.0049.000000T0000Z-210613T2345Z/
Laramie WY-
518 PM MDT Sun Jun 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM MDT
FOR EAST CENTRAL LARAMIE COUNTY...

At 517 PM MDT, a severe thunderstorm was located near Gun Barrel, or
32 miles northeast of Cheyenne, moving southeast at 15 mph.

HAZARD...Golf ball size hail.

SOURCE...Trained weather spotters. Quarter sized hail was reported 4 
         miles east southeast of Gun Barrel with this storm. 

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Albin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4139 10443 4150 10419 4147 10405 4121 10406
TIME...MOT...LOC 2317Z 297DEG 12KT 4140 10426 

HAIL...1.75IN
WIND...<50MPH
 
$$

Hammer

182 
WWUS55 KCYS 132343
SVSCYS

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

WYC021-132353-
/O.EXP.KCYS.SV.W.0049.000000T0000Z-210613T2345Z/
Laramie WY-
543 PM MDT Sun Jun 13 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LARAMIE COUNTY
WILL EXPIRE AT 545 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.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska...and southeastern Wyoming.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4139 10443 4150 10419 4147 10405 4121 10406
TIME...MOT...LOC 2343Z 294DEG 16KT 4136 10413 

$$

Hammer

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, 5:13 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	47 min
Jun 13, 5:16 PM MDT	Special Weather Statement	CYS	Laramie	44 min
Jun 13, 5:43 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	41 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.