Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 125, NWS Cheyenne, WY

August 14, 2021Box Butte County, Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 14, 2021, 6:21 PM MDT for Box Butte County, Morrill County, Nebraska. It was in force for 39 min. 3 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: Aug 14, 2021, 6:21 PM MDT (00:21 UTC)
Expired: Aug 14, 2021, 7:00 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 2.5 in
Wind: 60.0 mph

Counties Box Butte County, NE, Morrill County, NE

The radar

The Cheyenne radar (KCYS), 155 km from the middle of the area, began a volume at 00:22 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
Aug 14, 6:31 PM MDT	HAIL 2	15 Nne Bayard, NE
Aug 14, 6:38 PM MDT	HAIL 2.5	8 Nne Moomaws Corner, NE
Aug 14, 6:38 PM MDT	HAIL 3	8 Nne Moomaws Corner, 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
Aug 14, 3:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 0.4 hours before the alert went out and 226 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: 666 J/kg
Mixed-layer CIN: -45 J/kg
Mixed-layer LCL: 3335 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

274 
WUUS55 KCYS 150021
SVRCYS
NEC013-123-150100-
/O.NEW.KCYS.SV.W.0125.210815T0021Z-210815T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
621 PM MDT Sat Aug 14 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  South central Box Butte County in the Panhandle of Nebraska...
  Northwestern Morrill County in the Panhandle of Nebraska...

* Until 700 PM MDT.

* At 621 PM MDT, a severe thunderstorm was located 8 miles south of
  Kilpatrick Lake, or 21 miles east of Scottsbluff, moving south at
  20 mph.

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

  SOURCE...Trained weather spotters.

  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, Moomaws Corner, Angora and The Intersection Of Highway 385
  And L62.

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 4199 10336 4204 10318 4176 10296 4175 10336
TIME...MOT...LOC 0021Z 350DEG 17KT 4197 10328 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Claycomb

3 follow-up statements

615 
WWUS55 KCYS 150031
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
631 PM MDT Sat Aug 14 2021

NEC013-150041-
/O.CAN.KCYS.SV.W.0125.000000T0000Z-210815T0100Z/
Box Butte NE-
631 PM MDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BOX BUTTE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4199 10336 4199 10316 4176 10296 4175 10336
TIME...MOT...LOC 0031Z 350DEG 17KT 4192 10327 

$$

NEC123-150100-
/O.CON.KCYS.SV.W.0125.000000T0000Z-210815T0100Z/
Morrill NE-
631 PM MDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR NORTHWESTERN MORRILL COUNTY...

At 631 PM MDT, a severe thunderstorm was located 7 miles north of
Moomaws Corner, or 20 miles east of Scottsbluff, moving south at 20
mph.

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

SOURCE...Trained weather spotters.

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, Moomaws Corner, Angora and The Intersection Of Highway 385
And L62.

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 4199 10336 4199 10316 4176 10296 4175 10336
TIME...MOT...LOC 0031Z 350DEG 17KT 4192 10327 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Claycomb

791 
WWUS55 KCYS 150036
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
636 PM MDT Sat Aug 14 2021

NEC123-150100-
/O.CON.KCYS.SV.W.0125.000000T0000Z-210815T0100Z/
Morrill NE-
636 PM MDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM MDT
FOR NORTHWESTERN MORRILL COUNTY...

At 635 PM MDT, a severe thunderstorm was located near Moomaws Corner,
or 20 miles east of Scottsbluff, moving south at 20 mph.

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

SOURCE...Trained weather spotters. At 631 PM...2 inch hail was 
         reported 15 miles north northeast of Bayard.

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, Moomaws Corner, Angora and The Intersection Of Highway 385
And L62.

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 4197 10335 4197 10315 4176 10296 4175 10336
TIME...MOT...LOC 0035Z 350DEG 17KT 4190 10327 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Claycomb

694 
WWUS55 KCYS 150050
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
650 PM MDT Sat Aug 14 2021

NEC123-150100-
/O.EXP.KCYS.SV.W.0125.000000T0000Z-210815T0100Z/
Morrill NE-
650 PM MDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN MORRILL COUNTY
WILL EXPIRE AT 700 PM MDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM MDT for
the Panhandle of Nebraska.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4197 10335 4197 10315 4176 10296 4175 10336
TIME...MOT...LOC 0050Z 350DEG 17KT 4184 10326 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:29 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	46 min
Aug 14, 7:09 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	34 min
Aug 14, 7:34 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Cheyenne, Kimball, Morrill	41 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.