Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Cheyenne, WY

May 21, 20214 counties in Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 21, 2021, 5:26 PM MDT for 4 counties in Nebraska. It was in force for 49 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, 5:26 PM MDT (23:26 UTC)
Expired: May 21, 2021, 6:15 PM MDT
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Box Butte County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 149 km from the middle of the area, began a volume at 23:29 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, 5:30 PM MDT	HAIL 1.75	4 E Minatare, NE	DELAYED REPORT FROM MEDIA.
May 21, 6:13 PM MDT	HAIL 0.75	Lake Minatare, NE

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

Denver, CO (KDNR), launched 12:00Z, 11.4 hours before the alert went out and 235 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: 3153 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 48 m²/s²
0-3 km storm-relative helicity: 70 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

907 
WUUS55 KCYS 212326
SVRCYS
NEC013-123-157-165-220015-
/O.NEW.KCYS.SV.W.0008.210521T2326Z-210522T0015Z/

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

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Western Box Butte County in the Panhandle of Nebraska...
  Eastern Scotts Bluff County in the Panhandle of Nebraska...
  Northwestern Morrill County in the Panhandle of Nebraska...
  Southeastern Sioux County in the Panhandle of Nebraska...

* Until 615 PM MDT.

* At 525 PM MDT, a severe thunderstorm was located near Moomaws
  Corner, or 14 miles east of Scottsbluff, moving north at 45 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...
  Bayard, Minatare, Kilpatrick Lake, Lake Minatare Campground,
  Flahertys Corner, Moomaws Corner, Lake Minatare, South Bayard
  Junction and McGrew.

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 4171 10328 4172 10349 4237 10373 4237 10317
TIME...MOT...LOC 2325Z 177DEG 51KT 4179 10340 

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

Claycomb

2 follow-up statements

076 
WWUS55 KCYS 212349
SVSCYS

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

NEC013-123-157-165-220015-
/O.CON.KCYS.SV.W.0008.000000T0000Z-210522T0015Z/
Box Butte NE-Scotts Bluff NE-Morrill NE-Sioux NE-
549 PM MDT Fri May 21 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM MDT
FOR WESTERN BOX BUTTE...EASTERN SCOTTS BLUFF...NORTHWESTERN MORRILL
AND SOUTHEASTERN SIOUX COUNTIES...

At 549 PM MDT, a severe thunderstorm was located near Kilpatrick
Lake, or 23 miles northeast of Scottsbluff, moving north at 45 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...
Bayard, Minatare, Kilpatrick Lake, Lake Minatare Campground,
Flahertys Corner, Moomaws Corner, Lake Minatare, South Bayard
Junction and McGrew.

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 4171 10328 4172 10349 4237 10373 4237 10317
TIME...MOT...LOC 2349Z 178DEG 51KT 4214 10340 

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

Claycomb

702 
WWUS55 KCYS 220007
SVSCYS

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

NEC013-123-157-165-220017-
/O.EXP.KCYS.SV.W.0008.000000T0000Z-210522T0015Z/
Box Butte NE-Scotts Bluff NE-Morrill NE-Sioux NE-
607 PM MDT Fri May 21 2021

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN BOX BUTTE...EASTERN
SCOTTS BLUFF...NORTHWESTERN MORRILL AND SOUTHEASTERN SIOUX COUNTIES
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 4171 10328 4172 10349 4237 10373 4237 10317
TIME...MOT...LOC 0007Z 177DEG 51KT 4232 10341 

$$

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, 5:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 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.