Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 95, NWS Cheyenne, WY

July 9, 2021Box Butte County, Dawes County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 9, 2021, 9:22 PM MDT for Box Butte County, Dawes County, Nebraska. It was in force for 38 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: Jul 9, 2021, 9:22 PM MDT (03:22 UTC)
Expired: Jul 9, 2021, 10:00 PM MDT
In force: 38 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 2.0 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE

The radar

The Rapid City radar (KUDX), 171 km from the middle of the area, began a volume at 03:22 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jul 9, 2:16 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 3.4 hours before the alert went out and 165 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: 240 J/kg
Mixed-layer CIN: -260 J/kg
Mixed-layer LCL: 2327 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: -35 m²/s²
0-3 km storm-relative helicity: 76 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

745 
WUUS55 KCYS 100322
SVRCYS
NEC013-045-100400-
/O.NEW.KCYS.SV.W.0095.210710T0322Z-210710T0400Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
922 PM MDT Fri Jul 9 2021

The National Weather Service in Cheyenne has issued a

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

* Until 1000 PM MDT.

* At 922 PM MDT, a severe thunderstorm was located over Red Cloud
  Campground, or 11 miles south of Chadron, moving southeast at 40
  mph.

  HAZARD...Two inch 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...
  Crawford, Red Cloud Campground, Chadron Campground and Chadron St
  Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4269 10346 4278 10312 4278 10277 4245 10277
      4244 10275 4230 10274
TIME...MOT...LOC 0322Z 313DEG 35KT 4267 10300 

HAIL...2.00IN
WIND...60MPH
 
$$

Hammer

1 follow-up statement

022 
WWUS55 KCYS 100341
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
941 PM MDT Fri Jul 9 2021

NEC013-045-100400-
/O.CON.KCYS.SV.W.0095.000000T0000Z-210710T0400Z/
Box Butte NE-Dawes NE-
941 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1000 PM MDT
FOR NORTHEASTERN BOX BUTTE AND SOUTHEASTERN DAWES COUNTIES...

At 940 PM MDT, a severe thunderstorm was located 11 miles southwest
of Hay Springs, moving southeast at 40 mph.

HAZARD...Two inch 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.

This severe thunderstorm will remain over mainly rural areas of
northeastern Box Butte and southeastern Dawes Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move to a shelter, inside a strong building and away from
windows.

&&

LAT...LON 4252 10313 4267 10277 4245 10277 4244 10275
      4230 10274
TIME...MOT...LOC 0340Z 313DEG 35KT 4254 10282 

HAIL...2.00IN
WIND...60MPH
 
$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 6:07 PM MDT	Tornado Warning	CYS	Morrill	26 min
Jul 9, 8:04 PM MDT	Severe Thunderstorm Warning	CYS	Sioux	41 min
Jul 9, 8:31 PM MDT	Tornado Warning	CYS	Sioux	44 min
Jul 9, 8:47 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 min
Jul 9, 9:01 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	44 min
Jul 9, 9:33 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Morrill, Sioux	57 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.