Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 12, NWS Cheyenne, WY

May 23, 2021Goshen County, Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 23, 2021, 2:03 PM MDT for Goshen County, Laramie County, Wyoming. It was in force for 42 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: May 23, 2021, 2:03 PM MDT (20:03 UTC)
Expired: May 23, 2021, 2:45 PM MDT
In force: 42 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Goshen County, WY, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 46 km from the middle of the area, began a volume at 20:06 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 23, 12:06 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.1 hours before the alert went out and 184 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: 1106 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

017 
WUUS55 KCYS 232003
SVRCYS
WYC015-021-232045-
/O.NEW.KCYS.SV.W.0012.210523T2003Z-210523T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
203 PM MDT Sun May 23 2021

The National Weather Service in Cheyenne has issued a

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

* Until 245 PM MDT.

* At 202 PM MDT, a severe thunderstorm was located over Burns, or 22
  miles east of Cheyenne, moving north at 60 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  La Grange, Burns, Hillsdale, Hawk Springs Campground, Hawk Springs
  Recreation Area, Meriden Rest Area, Gun Barrel and Carpenter.

This includes Interstate 80 in Wyoming between mile markers 379 and
392.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4101 10427 4104 10452 4177 10436 4172 10408
TIME...MOT...LOC 2002Z 192DEG 53KT 4116 10437 

HAIL...1.00IN
WIND...60MPH
 
$$

Cox

2 follow-up statements

165 
WWUS55 KCYS 232023
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
223 PM MDT Sun May 23 2021

WYC015-021-232045-
/O.CON.KCYS.SV.W.0012.000000T0000Z-210523T2045Z/
Goshen WY-Laramie WY-
223 PM MDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 PM MDT
FOR SOUTHEASTERN GOSHEN AND EASTERN LARAMIE COUNTIES...

At 223 PM MDT, a severe thunderstorm was located near Albin, or 31
miles northwest of Kimball, moving north at 60 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
La Grange, Burns, Hillsdale, Hawk Springs Campground, Hawk Springs
Recreation Area, Meriden Rest Area, Gun Barrel and Carpenter.

This includes Interstate 80 in Wyoming between mile markers 379 and
392.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4101 10427 4104 10452 4177 10436 4172 10408
TIME...MOT...LOC 2023Z 196DEG 50KT 4141 10422 

HAIL...1.00IN
WIND...60MPH
 
$$

Cox

283 
WWUS55 KCYS 232041
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
241 PM MDT Sun May 23 2021

WYC015-021-232050-
/O.EXP.KCYS.SV.W.0012.000000T0000Z-210523T2045Z/
Goshen WY-Laramie WY-
241 PM MDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GOSHEN AND
EASTERN LARAMIE COUNTIES WILL EXPIRE AT 245 PM MDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However heavy rain is still possible with this
thunderstorm.

A Tornado Watch remains in effect until 800 PM MDT for southeastern
Wyoming.

LAT...LON 4101 10427 4104 10452 4177 10436 4172 10408
TIME...MOT...LOC 2040Z 192DEG 53KT 4162 10416 

$$

Cox

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 12:54 AM MDT	Dense Fog Advisory	CYS	Albany, Laramie	7 hr
May 23, 2:04 AM MDT	High Wind Warning	CYS	Albany, Carbon	18 hr
May 23, 1:18 PM MDT	Special Weather Statement	CYS	Laramie	42 min
May 23, 1:28 PM MDT	Special Weather Statement	CYS	Platte	47 min
May 23, 1:35 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Platte	29 min
May 23, 1:59 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	19 min
May 23, 2:38 PM MDT	Severe Thunderstorm Warning	CYS	Goshen	24 min
May 23, 3:22 PM MDT	Areal Flood Advisory	CYS	Laramie	3 hr

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.