Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Cheyenne, WY

May 21, 2021Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 21, 2021, 5:32 PM MDT for Dawes County, Nebraska. It was in force for 43 min. 2 reports 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: May 21, 2021, 5:32 PM MDT (23:32 UTC)
Expired: May 21, 2021, 6:15 PM MDT
In force: 43 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Dawes County, NE

The radar

The Rapid City radar (KUDX), 156 km from the middle of the area, began a volume at 23:33 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

Time	Report	Where	Remark
May 21, 5:35 PM MDT	HAIL 1.5	Chadron, NE	AT THE JOB CORPS BUILDING.
May 21, 5:38 PM MDT	HAIL 1.75	12 S Chadron, NE	MANY QUARTER SIZE HAIL AND A FEW GOLFBALL SIZE.

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

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 21, 4:17 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 11.5 hours before the alert went out and 150 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: 1093 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 112 m²/s²
0-3 km storm-relative helicity: 324 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

499 
WUUS55 KCYS 212332
SVRCYS
NEC045-220015-
/O.NEW.KCYS.SV.W.0009.210521T2332Z-210522T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
532 PM MDT Fri May 21 2021

The National Weather Service in Cheyenne has issued a

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

* Until 615 PM MDT.

* At 532 PM MDT, a severe thunderstorm was located near Red Cloud
  Campground, or 13 miles west of Hay Springs, moving northeast at 40
  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.

* Locations impacted include...
  Chadron, Red Cloud Campground, Chadron Campground and Chadron St
  Park.

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 4250 10294 4255 10310 4300 10307 4300 10280
      4279 10279 4278 10277 4263 10278
TIME...MOT...LOC 2332Z 203DEG 35KT 4263 10294 

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

Claycomb

2 follow-up statements

554 
WWUS55 KCYS 212341
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
541 PM MDT Fri May 21 2021

NEC045-220015-
/O.CON.KCYS.SV.W.0009.000000T0000Z-210522T0015Z/
Dawes NE-
541 PM MDT Fri May 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR NORTHEASTERN DAWES COUNTY...

At 540 PM MDT, a severe thunderstorm was located near Red Cloud
Campground, or 9 miles southeast of Chadron, moving north at 40 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated. At 538 PM...quarter to golf ball sized 
         hail was reported 12 miles south of Chadron.

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...
Chadron, Red Cloud Campground, Chadron Campground and Chadron St
Park.

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 4260 10295 4263 10305 4300 10307 4300 10280
      4279 10279 4278 10277 4263 10278
TIME...MOT...LOC 2340Z 200DEG 34KT 4271 10292 

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

Claycomb

506 
WWUS55 KCYS 220006
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
606 PM MDT Fri May 21 2021

NEC045-220016-
/O.EXP.KCYS.SV.W.0009.000000T0000Z-210522T0015Z/
Dawes NE-
606 PM MDT Fri May 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DAWES COUNTY WILL
EXPIRE AT 615 PM MDT...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1000 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4260 10295 4263 10305 4300 10307 4300 10280
      4279 10279 4278 10277 4263 10278
TIME...MOT...LOC 0006Z 203DEG 35KT 4290 10281 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 6:10 PM MDT	Special Weather Statement	CYS	Banner	50 min
May 20, 6:49 PM MDT	Special Weather Statement	CYS	Scotts Bluff	41 min
May 20, 6:54 PM MDT	Special Weather Statement	CYS	Kimball	51 min
May 20, 7:07 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	38 min
May 20, 7:15 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	45 min
May 20, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	39 min
May 20, 8:36 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	24 min
May 21, 4:10 PM MDT	Special Weather Statement	CYS	Dawes	50 min
May 21, 4:28 PM MDT	Special Weather Statement	CYS	Box Butte	47 min
May 21, 4:38 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	52 min
May 21, 5:26 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	49 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.