Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Cheyenne, WY

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

NWS Cheyenne, WY issued this severe thunderstorm warning at May 20, 2021, 7:15 PM MDT for Banner County, Cheyenne County, Kimball County, Nebraska. It was in force for 45 min. 2 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: May 20, 2021, 7:15 PM MDT (01:15 UTC)
Expired: May 20, 2021, 8:00 PM MDT
In force: 45 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), 106 km from the middle of the area, began a volume at 01:18 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, 7:25 PM MDT	HAIL 0.7	7 Ssw Dix, NE	MEASURED PEA TO DIME-SIZED HAIL.
May 20, 7:34 PM MDT	TSTM WND GST 60	10 Se 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, 1.3 hours before the alert went out and 155 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.

009 
WUUS55 KCYS 210115
SVRCYS
NEC007-033-105-210200-
/O.NEW.KCYS.SV.W.0003.210521T0115Z-210521T0200Z/

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

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Northwestern Cheyenne County in the Panhandle of Nebraska...
  Eastern Kimball County in the Panhandle of Nebraska...
  Southeastern Banner County in the Panhandle of Nebraska...

* Until 800 PM MDT.

* At 714 PM MDT, a severe thunderstorm was located 10 miles 
  northwest of Westplains, or 16 miles south of Kimball, moving 
  north at 40 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, Potter, Dix and Kimball Airport. 

This includes Interstate 80 in Nebraska between mile markers 19 and
44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4155 10368 4133 10309 4100 10339 4100 10370
      4101 10371
TIME...MOT...LOC 0114Z 192DEG 41KT 4101 10358 

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

Claycomb

1 follow-up statement

001 
WWUS55 KCYS 210136
SVSCYS

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

NEC007-033-105-210200-
/O.CON.KCYS.SV.W.0003.000000T0000Z-210521T0200Z/
Cheyenne NE-Kimball NE-Banner NE-
736 PM MDT Thu May 20 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR NORTHWESTERN CHEYENNE...EASTERN KIMBALL AND SOUTHEASTERN BANNER
COUNTIES...

At 735 PM MDT, a severe thunderstorm was located over Dix, or 7 miles
east of Kimball, moving north at 40 mph.

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

SOURCE...Trained weather spotters reported 60 mph winds 10 miles 
         southeast of Kimball at 734 PM.

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

Locations impacted include...
Kimball, Potter and Dix. 

This includes Interstate 80 in Nebraska between mile markers 21 and
44.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4155 10368 4133 10309 4100 10339 4100 10366
TIME...MOT...LOC 0135Z 192DEG 41KT 4125 10351 

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

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, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	39 min
May 20, 8:36 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball	24 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.