Alert archive / Wyoming / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS Cheyenne, WY

June 2, 2020Goshen County, Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 2, 2020, 8:34 PM MDT for Goshen County, Niobrara County, Wyoming. It was in force for 26 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 2, 2020, 8:34 PM MDT (02:34 UTC)
Expired
Jun 2, 2020, 9:00 PM MDT
In force
26 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Tornado
Possible
Hail
1.5 in
Wind
60.0 mph

Counties Goshen County, WY, Niobrara County, WY

The radar

The Cheyenne radar (KCYS), 170 km from the middle of the area, began a volume at 02:34 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

TimeReportWhereRemark
Jun 2, 9:07 PM MDTHAIL 0.75Van Tassell, WY

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.6 hours before the alert went out and 195 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2020-06-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 50 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2020-06-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -2 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
50 J/kg
Mixed-layer CIN
-218 J/kg
Mixed-layer LCL
1680 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
-2 m²/s²
0-3 km storm-relative helicity
143 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.0

Open this sounding in Storm Lab

The text

As transmitted.

721 
WUUS55 KCYS 030234
SVRCYS
WYC015-027-030300-
/O.NEW.KCYS.SV.W.0021.200603T0234Z-200603T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
834 PM MDT Tue Jun 2 2020

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Southeastern Niobrara County in east central Wyoming...
  Northeastern Goshen County in southeastern Wyoming...

* Until 900 PM MDT.

* At 833 PM MDT, a severe thunderstorm was located over Jay Em, or 17
  miles south of Lusk, moving northeast at 30 mph.

  HAZARD...Ping pong 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...
  Prairie Center, Jay Em and Van Tassell. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.

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

&&

LAT...LON 4280 10417 4269 10405 4254 10406 4239 10441
      4252 10455
TIME...MOT...LOC 0233Z 231DEG 26KT 4251 10439 

TORNADO...POSSIBLE
HAIL...1.50IN
WIND...60MPH
 
$$

Braun
1 follow-up statement
087 
WWUS55 KCYS 030248
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
848 PM MDT Tue Jun 2 2020

WYC015-027-030300-
/O.CON.KCYS.SV.W.0021.000000T0000Z-200603T0300Z/
Niobrara WY-Goshen WY-
848 PM MDT Tue Jun 2 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM MDT
FOR SOUTHEASTERN NIOBRARA AND NORTHEASTERN GOSHEN COUNTIES...

At 848 PM MDT, a severe thunderstorm was located near Prairie Center,
or 15 miles southeast of Lusk, moving northeast at 30 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...
Prairie Center and Van Tassell. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

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

&&

LAT...LON 4280 10417 4269 10405 4254 10406 4247 10429
      4250 10438 4258 10442
TIME...MOT...LOC 0248Z 231DEG 26KT 4258 10427 

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

Braun

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 2, 6:28 PM MDTSevere Thunderstorm WarningCYSGoshen32 min
Jun 2, 6:59 PM MDTSevere Thunderstorm WarningCYSGoshen46 min
Jun 2, 7:08 PM MDTSpecial Weather StatementCYSGoshen37 min
Jun 2, 7:28 PM MDTSevere Thunderstorm WarningCYSGoshen17 min
Jun 2, 7:56 PM MDTSpecial Weather StatementCYSGoshen34 min
Jun 2, 8:19 PM MDTSevere Thunderstorm WarningCYSGoshen, Platte41 min
Jun 2, 8:59 PM MDTSevere Thunderstorm WarningCYSNiobrara31 min
Jun 3, 3:22 PM MDTSevere Thunderstorm WarningCYSLaramie38 min
Jun 3, 3:27 PM MDTSevere Thunderstorm WarningCYSLaramie33 min
Jun 3, 3:40 PM MDTSevere Thunderstorm WarningCYSLaramie35 min
Jun 3, 4:04 PM MDTSpecial Weather StatementCYSLaramie26 min
Jun 3, 4:15 PM MDTSpecial Weather StatementCYSPlatte30 min
Jun 3, 4:42 PM MDTSevere Thunderstorm WarningCYSLaramie33 min
Jun 3, 4:54 PM MDTSpecial Weather StatementCYSLaramie36 min
Jun 3, 4:56 PM MDTSpecial Weather StatementCYSPlatte34 min
Jun 3, 5:46 PM MDTSpecial Weather StatementCYSPlatte29 min

Nearby

Severe Thunderstorm Warnings in Wyoming, 2020Every severe thunderstorm warning in 2020

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.