Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 121, NWS Cheyenne, WY

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

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 14, 2021, 4:45 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 45 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 14, 2021, 4:45 PM MDT (22:45 UTC)
Expired: Aug 14, 2021, 5:30 PM MDT
In force: 45 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 173 km from the middle of the area, began a volume at 22:45 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 14, 3:28 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.8 hours before the alert went out and 167 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: 911 J/kg
Mixed-layer CIN: -150 J/kg
Mixed-layer LCL: 1691 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 90 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

831 
WUUS55 KCYS 142245
SVRCYS
NEC013-045-142330-
/O.NEW.KCYS.SV.W.0121.210814T2245Z-210814T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
445 PM MDT Sat Aug 14 2021

The National Weather Service in Cheyenne has issued a

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

* Until 530 PM MDT.

* At 445 PM MDT, a severe thunderstorm was located near Red Cloud
  Campground, or 11 miles west of Hay Springs, moving southeast at 15
  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.

* Locations impacted include...
  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 4262 10305 4280 10292 4269 10277 4245 10277
      4244 10275 4236 10275
TIME...MOT...LOC 2245Z 301DEG 11KT 4268 10291 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MD/GCC

2 follow-up statements

893 
WWUS55 KCYS 142305
SVSCYS

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

NEC013-142314-
/O.CAN.KCYS.SV.W.0121.000000T0000Z-210814T2330Z/
Box Butte NE-
505 PM MDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BOX BUTTE COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning 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 4257 10297 4277 10288 4269 10277 4245 10277
TIME...MOT...LOC 2304Z 301DEG 11KT 4265 10284 

$$

NEC045-142330-
/O.CON.KCYS.SV.W.0121.000000T0000Z-210814T2330Z/
Dawes NE-
505 PM MDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR EAST CENTRAL DAWES COUNTY...

At 504 PM MDT, a severe thunderstorm was located 8 miles west of Hay
Springs, moving southeast at 15 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 east
central Dawes 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 4257 10297 4277 10288 4269 10277 4245 10277
TIME...MOT...LOC 2304Z 301DEG 11KT 4265 10284 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

MD/GCC

768 
WWUS55 KCYS 142326
SVSCYS

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

NEC045-142336-
/O.EXP.KCYS.SV.W.0121.000000T0000Z-210814T2330Z/
Dawes NE-
526 PM MDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL DAWES COUNTY WILL
EXPIRE AT 530 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.

LAT...LON 4257 10297 4277 10288 4269 10277 4245 10277
TIME...MOT...LOC 2326Z 301DEG 11KT 4262 10277 

$$

MD/GCC

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 3:54 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	51 min
Aug 14, 4:06 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	39 min
Aug 14, 4:14 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Dawes	46 min
Aug 14, 4:50 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Box Butte, Dawes, Sioux	40 min
Aug 14, 5:22 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	38 min
Aug 14, 5:52 PM MDT	Severe Thunderstorm Warning Destructive damage threat	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	38 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.