Alert archive / Wyoming / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 18, NWS Cheyenne, WY

May 26, 2021Niobrara County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at May 26, 2021, 4:30 PM MDT for Niobrara County, Wyoming. It was in force for 25 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 26, 2021, 4:30 PM MDT (22:30 UTC)
Expired: May 26, 2021, 4:55 PM MDT
In force: 25 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

County Niobrara County, WY

The radar

The Rapid City radar (KUDX), 184 km from the middle of the area, began a volume at 22:32 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 26, 1:27 PM MDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.5 hours before the alert went out and 177 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: 797 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 366 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

263 
WUUS55 KCYS 262230
SVRCYS
WYC027-262315-
/O.NEW.KCYS.SV.W.0018.210526T2230Z-210526T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
430 PM MDT Wed May 26 2021

The National Weather Service in Cheyenne has issued a

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

* Until 515 PM MDT.

* At 430 PM MDT, a severe thunderstorm was located 14 miles northwest
  of Lance Creek, or 35 miles northwest of Lusk, moving east at 30
  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
  northwestern Niobrara County.

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.

&&

LAT...LON 4310 10489 4330 10489 4334 10445 4310 10443
TIME...MOT...LOC 2230Z 264DEG 27KT 4320 10480 

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

Jamski

2 follow-up statements

675 
WWUS55 KCYS 262243
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
443 PM MDT Wed May 26 2021

WYC027-262315-
/O.CON.KCYS.SV.W.0018.000000T0000Z-210526T2315Z/
Niobrara WY-
443 PM MDT Wed May 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM MDT
FOR NORTHWESTERN NIOBRARA COUNTY...

At 443 PM MDT, a severe thunderstorm was located 13 miles north of
Lance Creek, or 32 miles north of Lusk, moving east at 35 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
northwestern Niobrara County.

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.

&&

LAT...LON 4310 10489 4330 10489 4334 10445 4310 10443
TIME...MOT...LOC 2243Z 263DEG 29KT 4321 10461 

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

Jamski

532 
WWUS55 KCYS 262255
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
455 PM MDT Wed May 26 2021

WYC027-262305-
/O.CAN.KCYS.SV.W.0018.000000T0000Z-210526T2315Z/
Niobrara WY-
455 PM MDT Wed May 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN NIOBRARA COUNTY
IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.  However gusty winds and heavy rain are still
possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
east central Wyoming.

LAT...LON 4310 10489 4330 10489 4334 10445 4310 10443
TIME...MOT...LOC 2253Z 264DEG 27KT 4322 10448 

$$

Jamski

The office that day

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

Issued	Product	Office	Counties	Lasted
May 26, 3:28 PM MDT	Special Weather Statement	CYS	Goshen	47 min
May 26, 3:51 PM MDT	Special Weather Statement	CYS	Goshen	24 min
May 26, 4:07 PM MDT	Special Weather Statement	CYS	Goshen	23 min
May 26, 4:14 PM MDT	Special Weather Statement	CYS	Niobrara	46 min
May 26, 5:02 PM MDT	Special Weather Statement	CYS	Niobrara	28 min
May 26, 5:10 PM MDT	Special Weather Statement	CYS	Laramie	35 min
May 26, 5:30 PM MDT	Severe Thunderstorm Warning	CYS	Laramie	34 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.