Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 31, NWS Cheyenne, WY

June 6, 2021Laramie County, Wyoming; Kimball County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 6, 2021, 5:21 PM MDT for Laramie County, Wyoming; Kimball County, Nebraska. It was in force for 39 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: Jun 6, 2021, 5:21 PM MDT (23:21 UTC)
Expired: Jun 6, 2021, 6:00 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Kimball County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 66 km from the middle of the area, began a volume at 23:25 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

Denver, CO (KDNR), launched 12:00Z, 11.4 hours before the alert went out and 153 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: 2939 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 85 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

295 
WUUS55 KCYS 062321
SVRCYS
NEC105-WYC021-070000-
/O.NEW.KCYS.SV.W.0031.210606T2321Z-210607T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
521 PM MDT Sun Jun 6 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Southwestern Kimball County in the Panhandle of Nebraska...
  Southeastern Laramie County in southeastern Wyoming...

* Until 600 PM MDT.

* At 521 PM MDT, a severe thunderstorm was located near Panorama
  Point, or 22 miles southwest of Kimball, moving east at 15 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Pine Bluffs and Panorama Point. 

This includes the following highways...
 Interstate 80 in Wyoming between mile markers 397 and 400, and near
mile marker 402.
 Interstate 80 in Nebraska between mile markers 1 and 8.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 4115 10415 4123 10391 4100 10382 4100 10410
TIME...MOT...LOC 2321Z 253DEG 14KT 4109 10405 

HAIL...1.25IN
WIND...60MPH
 
$$

Claycomb

2 follow-up statements

829 
WWUS55 KCYS 062334
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
534 PM MDT Sun Jun 6 2021

WYC021-062343-
/O.CAN.KCYS.SV.W.0031.000000T0000Z-210607T0000Z/
Laramie WY-
534 PM MDT Sun Jun 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LARAMIE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4115 10404 4123 10391 4100 10382 4104 10404
TIME...MOT...LOC 2333Z 253DEG 14KT 4110 10399 

$$

NEC105-070000-
/O.CON.KCYS.SV.W.0031.000000T0000Z-210607T0000Z/
Kimball NE-
534 PM MDT Sun Jun 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 600 PM MDT
FOR SOUTHWESTERN KIMBALL COUNTY...

At 533 PM MDT, a severe thunderstorm was located near Pine Bluffs, or
19 miles southwest of Kimball, moving east at 15 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

This severe thunderstorm will remain over mainly rural areas of
southwestern Kimball County.

This includes Interstate 80 in Nebraska between mile markers 5 and 8.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Cheyenne.

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

&&

LAT...LON 4115 10404 4123 10391 4100 10382 4104 10404
TIME...MOT...LOC 2333Z 253DEG 14KT 4110 10399 

HAIL...1.25IN
WIND...60MPH
 
$$

Claycomb

823 
WWUS55 KCYS 062351
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
551 PM MDT Sun Jun 6 2021

NEC105-070001-
/O.EXP.KCYS.SV.W.0031.000000T0000Z-210607T0000Z/
Kimball NE-
551 PM MDT Sun Jun 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN KIMBALL COUNTY
WILL EXPIRE AT 600 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.  However heavy rain
is still possible with this thunderstorm.

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

LAT...LON 4115 10404 4123 10391 4100 10382 4104 10404
TIME...MOT...LOC 2351Z 253DEG 14KT 4112 10391 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 7:16 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara, Platte	28 min
Jun 5, 7:53 PM MDT	Severe Thunderstorm Warning	CYS	Goshen, Niobrara	22 min
Jun 6, 3:24 PM MDT	Special Weather Statement	CYS	Laramie	36 min
Jun 6, 5:32 PM MDT	Severe Thunderstorm Warning	CYS	Laramie, Platte	43 min
Jun 6, 5:02 PM MDT	Special Weather Statement	CYS	Kimball	43 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2021 Severe Thunderstorm Warnings in Nebraska, 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.