Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 76, NWS Cheyenne, WY

July 3, 2021Box Butte County, Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 3, 2021, 4:46 PM MDT for Box Butte County, Dawes County, Sioux County, Nebraska. It was in force for 28 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 3, 2021, 4:46 PM MDT (22:46 UTC)
Expired: Jul 3, 2021, 5:14 PM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Box Butte County, NE, Dawes County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 179 km from the middle of the area, began a volume at 22:49 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 3, 3:33 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.8 hours before the alert went out and 192 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: 444 J/kg
Mixed-layer CIN: -308 J/kg
Mixed-layer LCL: 2214 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 38 m²/s²
0-3 km storm-relative helicity: 54 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

586 
WUUS55 KCYS 032246
SVRCYS
NEC013-045-165-032345-
/O.NEW.KCYS.SV.W.0076.210703T2246Z-210703T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
446 PM MDT Sat Jul 3 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northwestern Box Butte County in the Panhandle of Nebraska...
  Southwestern Dawes County in the Panhandle of Nebraska...
  East central Sioux County in the Panhandle of Nebraska...

* Until 545 PM MDT.

* At 446 PM MDT, a severe thunderstorm was located 8 miles north of
  Flahertys Corner, or 35 miles southwest of Chadron, moving east at
  15 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...
  Flahertys Corner and Marsland. 

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 4241 10360 4251 10353 4247 10312 4215 10330
TIME...MOT...LOC 2246Z 285DEG 14KT 4244 10346 

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

Hammer

1 follow-up statement

923 
WWUS55 KCYS 032314
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
514 PM MDT Sat Jul 3 2021

NEC013-045-165-032323-
/O.CAN.KCYS.SV.W.0076.000000T0000Z-210703T2345Z/
Box Butte NE-Dawes NE-Sioux NE-
514 PM MDT Sat Jul 3 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN BOX BUTTE...
SOUTHWESTERN DAWES AND EAST CENTRAL SIOUX COUNTIES IS CANCELLED...
                
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 has been cancelled.

A Severe Thunderstorm Watch remains in effect until 1000 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 4241 10360 4251 10353 4247 10312 4215 10330
TIME...MOT...LOC 2310Z 285DEG 14KT 4241 10332 

$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 3, 3:01 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	30 min
Jul 3, 3:06 PM MDT	Special Weather Statement	CYS	Box Butte	39 min
Jul 3, 3:42 PM MDT	Special Weather Statement	CYS	Kimball	48 min
Jul 3, 3:48 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	31 min
Jul 3, 3:51 PM MDT	Special Weather Statement	CYS	Banner	39 min
Jul 3, 3:57 PM MDT	Special Weather Statement	CYS	Cheyenne	48 min
Jul 3, 4:18 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	57 min
Jul 3, 4:43 PM MDT	Special Weather Statement	CYS	Cheyenne	47 min
Jul 3, 4:43 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	47 min
Jul 3, 5:03 PM MDT	Special Weather Statement	CYS	Morrill	42 min
Jul 3, 5:15 PM MDT	Special Weather Statement	CYS	Dawes	30 min
Jul 3, 5:21 PM MDT	Special Weather Statement	CYS	Cheyenne	39 min
Jul 3, 5:29 PM MDT	Special Weather Statement	CYS	Dawes	31 min
Jul 3, 5:40 PM MDT	Special Weather Statement	CYS	Morrill	50 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.