Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 116, NWS Cheyenne, WY

August 6, 2021Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 6, 2021, 5:57 PM MDT for Dawes County, Nebraska. It was in force for 18 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: Aug 6, 2021, 5:57 PM MDT (23:57 UTC)
Expired: Aug 6, 2021, 6:15 PM MDT
In force: 18 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 146 km from the middle of the area, began a volume at 23:54 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
Aug 6, 1:43 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 12.0 hours before the alert went out and 140 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: 117 J/kg
Mixed-layer CIN: -465 J/kg
Mixed-layer LCL: 1438 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

288 
WUUS55 KCYS 062357
SVRCYS
NEC045-070015-
/O.NEW.KCYS.SV.W.0116.210806T2357Z-210807T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
557 PM MDT Fri Aug 6 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northeastern Dawes County in the Panhandle of Nebraska...

* Until 615 PM MDT.

* At 556 PM MDT, a severe thunderstorm was located 7 miles east of
  Chadron, moving east at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Chadron, Chadron Airport and Chadron Campground. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4271 10320 4300 10325 4300 10280 4279 10279
      4278 10277 4270 10277
TIME...MOT...LOC 2356Z 248DEG 24KT 4280 10285 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mokry

1 follow-up statement

142 
WWUS55 KCYS 070016
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
616 PM MDT Fri Aug 6 2021

NEC045-070025-
/O.EXP.KCYS.SV.W.0116.000000T0000Z-210807T0015Z/
Dawes NE-
616 PM MDT Fri Aug 6 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DAWES COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 800 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4271 10320 4300 10325 4300 10280 4279 10279
      4278 10277 4270 10277
TIME...MOT...LOC 0015Z 248DEG 24KT 4284 10271 

$$

Mokry

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 3:09 PM MDT	Special Weather Statement	CYS	Scotts Bluff	51 min
Aug 6, 3:31 PM MDT	Special Weather Statement	CYS	Banner	44 min
Aug 6, 3:53 PM MDT	Special Weather Statement	CYS	Banner, Cheyenne, Morrill, Scotts Bluff	52 min
Aug 6, 5:15 PM MDT	Special Weather Statement	CYS	Dawes	45 min

Nearby

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.