Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 6, NWS Cheyenne, WY

May 20, 2021Banner County, Cheyenne County, Kimball County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 20, 2021, 8:36 PM MDT for Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 24 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: May 20, 2021, 8:36 PM MDT (02:36 UTC)
Expired: May 20, 2021, 9:00 PM MDT
In force: 24 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Banner County, NE, Cheyenne County, NE, Kimball County, NE

The radar

The Cheyenne radar (KCYS), 103 km from the middle of the area, began a volume at 02:38 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
May 20, 8:37 PM MDT	HAIL 1	7 Ssw Kimball, NE

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.6 hours before the alert went out and 154 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: 66 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 3320 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 120 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

581 
WUUS55 KCYS 210236
SVRCYS
NEC007-033-105-210300-
/O.NEW.KCYS.SV.W.0006.210521T0236Z-210521T0300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
836 PM MDT Thu May 20 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  West central Cheyenne County in the Panhandle of Nebraska...
  Northeastern Kimball County in the Panhandle of Nebraska...
  South central Banner County in the Panhandle of Nebraska...

* Until 900 PM MDT.

* At 836 PM MDT, a severe thunderstorm was located over Kimball
  Airport, or over Kimball, moving northeast at 35 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...
  Kimball, Dix and Kimball Airport. 

This includes Interstate 80 in Nebraska between mile markers 14 and
34.
 
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 4109 10357 4115 10381 4147 10369 4134 10326
TIME...MOT...LOC 0236Z 206DEG 30KT 4120 10367 

HAIL...1.00IN
WIND...60MPH
 
$$

Claycomb

1 follow-up statement

217 
WWUS55 KCYS 210251
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
851 PM MDT Thu May 20 2021

NEC007-033-105-210301-
/O.EXP.KCYS.SV.W.0006.000000T0000Z-210521T0300Z/
Cheyenne NE-Kimball NE-Banner NE-
851 PM MDT Thu May 20 2021

...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL CHEYENNE...
NORTHEASTERN KIMBALL AND SOUTH CENTRAL BANNER COUNTIES WILL EXPIRE AT
900 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.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Cheyenne.

LAT...LON 4109 10357 4115 10381 4147 10369 4134 10326
TIME...MOT...LOC 0251Z 206DEG 30KT 4130 10360 

$$

Claycomb

The office that day

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

Issued	Product	Office	Counties	Lasted
May 20, 6:10 PM MDT	Special Weather Statement	CYS	Banner	50 min
May 20, 6:49 PM MDT	Special Weather Statement	CYS	Scotts Bluff	41 min
May 20, 6:54 PM MDT	Special Weather Statement	CYS	Kimball	51 min
May 20, 7:07 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	38 min
May 20, 7:15 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	45 min
May 20, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	39 min
May 21, 4:10 PM MDT	Special Weather Statement	CYS	Dawes	50 min
May 21, 4:28 PM MDT	Special Weather Statement	CYS	Box Butte	47 min
May 21, 4:38 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	52 min
May 21, 5:26 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill, Scotts Bluff, Sioux	49 min
May 21, 5:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 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.