Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 45, NWS Cheyenne, WY

June 10, 2021Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 10, 2021, 8:43 PM MDT for Niobrara County, Wyoming. It was in force for 35 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 10, 2021, 8:43 PM MDT (02:43 UTC)
Expired: Jun 10, 2021, 9:18 PM MDT
In force: 35 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 181 km from the middle of the area, began a volume at 02:47 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

Rapid City, SD (KUNR), launched 00:00Z, 2.7 hours before the alert went out and 174 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: 1559 J/kg
Mixed-layer CIN: -71 J/kg
Mixed-layer LCL: 2700 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 15.0

Open this sounding in Storm Lab

The text

As transmitted.

281 
WUUS55 KCYS 110243
SVRCYS
WYC027-110330-
/O.NEW.KCYS.SV.W.0045.210611T0243Z-210611T0330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
843 PM MDT Thu Jun 10 2021

The National Weather Service in Cheyenne has issued a

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

* Until 930 PM MDT.

* At 843 PM MDT, a severe thunderstorm was located near Lusk, moving
  northeast at 45 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.

* This severe thunderstorm will remain over mainly rural areas of
  southeastern Niobrara County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4271 10407 4265 10440 4279 10455 4339 10406
TIME...MOT...LOC 0243Z 222DEG 37KT 4280 10441 

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

Rubin

2 follow-up statements

036 
WWUS55 KCYS 110258
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
858 PM MDT Thu Jun 10 2021

WYC027-110330-
/O.CON.KCYS.SV.W.0045.000000T0000Z-210611T0330Z/
Niobrara WY-
858 PM MDT Thu Jun 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM MDT
FOR SOUTHEASTERN NIOBRARA COUNTY...

At 858 PM MDT, a severe thunderstorm was located 16 miles northeast
of Lusk, moving northeast at 50 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.

This severe thunderstorm will remain over mainly rural areas of
southeastern Niobrara County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4271 10407 4278 10430 4301 10437 4339 10406
TIME...MOT...LOC 0258Z 217DEG 43KT 4295 10426 

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

Rubin

951 
WWUS55 KCYS 110318
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
918 PM MDT Thu Jun 10 2021

WYC027-110327-
/O.CAN.KCYS.SV.W.0045.000000T0000Z-210611T0330Z/
Niobrara WY-
918 PM MDT Thu Jun 10 2021

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

LAT...LON 4271 10407 4278 10430 4301 10437 4339 10406
TIME...MOT...LOC 0316Z 222DEG 37KT 4310 10407 

$$

Rubin

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 10, 8:27 PM MDT	Special Weather Statement	CYS	Niobrara	48 min
Jun 10, 8:52 PM MDT	Special Weather Statement	CYS	Goshen	53 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.