Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 130, NWS Cheyenne, WY

August 14, 2021Cheyenne County, Kimball County, Morrill County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Aug 14, 2021, 7:34 PM MDT for Cheyenne County, Kimball County, Morrill County, Nebraska. It was in force for 41 min. 1 report 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, 7:34 PM MDT (01:34 UTC)
Expired: Aug 14, 2021, 8:15 PM MDT
In force: 41 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Cheyenne County, NE, Kimball County, NE, Morrill County, NE

The radar

The Cheyenne radar (KCYS), 162 km from the middle of the area, began a volume at 01:35 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
Aug 14, 7:42 PM MDT	HAIL 1.5	7 Sw Bridgeport, 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, 1.6 hours before the alert went out and 159 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.

319 
WUUS55 KCYS 150134
SVRCYS
NEC033-105-123-150215-
/O.NEW.KCYS.SV.W.0130.210815T0134Z-210815T0215Z/

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

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Cheyenne County in the Panhandle of Nebraska...
  Southeastern Kimball County in the Panhandle of Nebraska...
  Southern Morrill County in the Panhandle of Nebraska...

* Until 815 PM MDT.

* At 734 PM MDT, severe thunderstorms were located along a line
  extending from 9 miles northeast of Northport to near Dalton to 7
  miles south of Potter, moving southeast at 35 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...
  Sidney, Bridgeport, Potter, Lodgepole, Dalton, Gurley, Sunol,
  Brownson, Northport, Bridgeport State Recreation Area, Colton,
  Lorenzo, The Intersection Of Highway 385 And 92, Court House And
  Jail Rocks, Sidney Airport and Broadwater.

This includes Interstate 80 in Nebraska between mile markers 32 and
77.
 
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 4100 10263 4100 10348 4109 10355 4184 10306
      4169 10264 4140 10263 4139 10261 4105 10261
TIME...MOT...LOC 0134Z 292DEG 29KT 4177 10294 4137 10291 4111 10331 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Claycomb

2 follow-up statements

585 
WWUS55 KCYS 150202
SVSCYS

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

NEC033-105-123-150215-
/O.CON.KCYS.SV.W.0130.000000T0000Z-210815T0215Z/
Cheyenne NE-Kimball NE-Morrill NE-
802 PM MDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM MDT
FOR CHEYENNE...SOUTHEASTERN KIMBALL AND SOUTHEASTERN MORRILL
COUNTIES...

At 801 PM MDT, severe thunderstorms were located along a line
extending from 6 miles northeast of The Intersection Of Highway 385
And 92 to 10 miles north of Sunol to near Peetz, moving southeast at
30 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Sidney, Lodgepole, Dalton, Gurley, Colton, Sunol, Brownson, Lorenzo,
The Intersection Of Highway 385 And 92, Sidney Airport and
Broadwater.

This includes Interstate 80 in Nebraska between mile markers 40 and
77.
 
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 4100 10263 4100 10337 4109 10338 4172 10295
      4169 10264 4140 10263 4139 10261 4105 10261
TIME...MOT...LOC 0201Z 293DEG 24KT 4165 10288 4131 10276 4100 10320 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Claycomb

274 
WWUS55 KCYS 150211
SVSCYS

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

NEC033-105-123-150220-
/O.EXP.KCYS.SV.W.0130.000000T0000Z-210815T0215Z/
Cheyenne NE-Kimball NE-Morrill NE-
811 PM MDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR CHEYENNE...SOUTHEASTERN
KIMBALL AND SOUTHEASTERN MORRILL COUNTIES WILL EXPIRE AT 815 PM
MDT...
    
The storms which prompted the warning have weakened or moved out of 
moved out of the area. 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 4100 10263 4100 10337 4109 10338 4172 10295
      4169 10264 4140 10263 4139 10261 4105 10261
TIME...MOT...LOC 0210Z 292DEG 29KT 4164 10284 4130 10272 4099 10316 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:21 PM MDT	Severe Thunderstorm Warning Considerable damage threat	CYS	Box Butte, Morrill	39 min
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

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.