Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 14, NWS Cheyenne, WY

May 23, 2021Cheyenne County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at May 23, 2021, 4:22 PM MDT for Cheyenne County, Nebraska. It was in force for 38 min. 7 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 23, 2021, 4:22 PM MDT (22:22 UTC)
Expired: May 23, 2021, 5:00 PM MDT
In force: 38 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Possible
Hail: 1.5 in
Wind: 70.0 mph

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 171 km from the middle of the area, began a volume at 22:24 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 23, 4:48 PM MDT	HAIL 1.5	10 Se Sidney, NE
May 23, 4:48 PM MDT	HAIL 1.5	Sunol, NE
May 23, 4:51 PM MDT	HAIL 1	7 Sse Sidney, NE
May 23, 4:53 PM MDT	HAIL 2.5	Lodgepole, NE	SOCIAL MEDIA REPORT WITH PICTURES
May 23, 4:53 PM MDT	HAIL 2.5	Lodgepole, NE	SOCIAL MEDIA REPORT WITH PICTURES.
May 23, 4:55 PM MDT	HAIL 1.5	1 N Sunol, NE
May 23, 5:04 PM MDT	HAIL 3	4 S Sunol, 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
May 23, 12:06 PM MDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 10.4 hours before the alert went out and 144 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1106 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

513 
WUUS55 KCYS 232222
SVRCYS
NEC033-232300-
/O.NEW.KCYS.SV.W.0014.210523T2222Z-210523T2300Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
422 PM MDT Sun May 23 2021

The National Weather Service in Cheyenne has issued a

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

* Until 500 PM MDT.

* At 420 PM MDT, a severe thunderstorm was located near Proctor, or 
  15 miles northeast of Sterling, moving north at 45 mph. 

  HAZARD...70 mph wind gusts and ping pong ball size hail.

  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...
  Sidney, Lodgepole, Colton, Sunol and Sidney Airport. 

This includes Interstate 80 in Nebraska between mile markers 58 and
76.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 800 PM MDT for the Panhandle
of Nebraska.

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

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

This thunderstorm is capable of producing all types of severe weather
including extremely large hail, destructive straight line winds and
tornadoes. Move quickly to a safe shelter such as an interior room, a
bathroom, closet or basement.

&&

LAT...LON 4100 10272 4100 10304 4129 10291 4123 10261
      4116 10261
TIME...MOT...LOC 2220Z 201DEG 40KT 4080 10300 

TORNADO...POSSIBLE
HAIL...1.50IN
WIND...70MPH
 
$$

Cox

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 2:38 PM MDT	Severe Thunderstorm Warning	CYS	Scotts Bluff, Sioux	24 min
May 23, 3:45 PM MDT	Special Weather Statement	CYS	Dawes	45 min
May 23, 3:53 PM MDT	Special Weather Statement	CYS	Morrill	52 min
May 23, 4:31 PM MDT	Tornado Warning Considerable damage threat	CYS	Cheyenne	44 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.