Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 54, NWS Cheyenne, WY

June 13, 2021Box Butte County, Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Jun 13, 2021, 6:42 PM MDT for Box Butte County, Dawes County, Sioux County, Nebraska. It was in force for 48 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: Jun 13, 2021, 6:42 PM MDT (00:42 UTC)
Expired: Jun 13, 2021, 7:30 PM MDT
In force: 48 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.75 in
Wind: 70.0 mph

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

The radar

The Cheyenne radar (KCYS), 188 km from the middle of the area, began a volume at 00:43 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
Jun 13, 7:14 PM MDT	HAIL 1	8 E Agate Fossil Beds N, NE	REPORT RECEIVED VIA SPOTTERNETWORK.ORG
Jun 13, 7:20 PM MDT	TSTM WND DMG	10 Ene Agate, NE	60 MPH WINDS REPORTED, BLEW THE DOG HOUSES AWAY. PEA SIZED HAIL, 0.10 RAINFALL.
Jun 13, 7:30 PM MDT	TSTM WND GST 72	6 Ese Box Butte Dam, 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
Jun 13, 3:04 PM MDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.7 hours before the alert went out and 185 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: 1422 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 1895 m above ground
0-6 km bulk shear: 25 kt
0-1 km storm-relative helicity: 2 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.9

Open this sounding in Storm Lab

The text

As transmitted.

639 
WUUS55 KCYS 140042
SVRCYS
NEC013-045-165-140130-
/O.NEW.KCYS.SV.W.0054.210614T0042Z-210614T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
642 PM MDT Sun Jun 13 2021

The National Weather Service in Cheyenne has issued a

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

* Until 730 PM MDT.

* At 642 PM MDT, severe thunderstorms were located along a line
  extending from 8 miles northwest of Box Butte Campground to 13
  miles west of Box Butte Dam to 10 miles northwest of Flahertys
  Corner to 7 miles north of Agate Bed National Monument, moving
  southeast at 10 mph.

  HAZARD...Golf ball size hail and 70 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           considerable tree damage. Wind damage is also likely to 
           mobile homes, roofs, and outbuildings.

* Locations impacted include...
  Hemingford, Wild Horse Butte, Box Butte Campground, Berea,
  Flahertys Corner, Box Butte Dam and Marsland.

This replaces the Severe Thunderstorm Warning which was previously 
in effect for the warned area. 

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.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4216 10337 4251 10390 4265 10377 4265 10350
      4271 10328 4252 10277 4216 10274
TIME...MOT...LOC 0042Z 327DEG 10KT 4257 10318 4249 10334 4246 10355
4252 10381

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...70MPH
 
$$

Hammer

1 follow-up statement

684 
WWUS55 KCYS 140105
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
705 PM MDT Sun Jun 13 2021

NEC013-045-165-140130-
/O.CON.KCYS.SV.W.0054.000000T0000Z-210614T0130Z/
Box Butte NE-Dawes NE-Sioux NE-
705 PM MDT Sun Jun 13 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM MDT
FOR BOX BUTTE...SOUTHERN DAWES AND EAST CENTRAL SIOUX COUNTIES...

At 705 PM MDT, severe thunderstorms were located along a line
extending from near Box Butte Campground to 8 miles west of Box Butte
Dam to 6 miles north of Flahertys Corner to near Agate Bed National
Monument, moving southeast at 10 mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

Locations impacted include...
Hemingford, Wild Horse Butte, Box Butte Campground, Berea, Flahertys
Corner, Box Butte Dam and Marsland.

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.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4216 10337 4248 10385 4260 10373 4260 10338
      4266 10315 4252 10277 4216 10274
TIME...MOT...LOC 0105Z 319DEG 11KT 4253 10309 4245 10325 4242 10346
4248 10372

TORNADO...POSSIBLE
HAIL...1.75IN
WIND...70MPH
 
$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 13, 7:27 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	48 min
Jun 13, 7:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 min
Jun 13, 7:38 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Cheyenne, Morrill	52 min
Jun 13, 8:52 PM MDT	Severe Thunderstorm Warning	CYS	Morrill	53 min
Jun 13, 9:43 PM MDT	Special Weather Statement	CYS	Morrill	47 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.