Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Cheyenne, WY

July 9, 2021Banner County, Kimball County, Nebraska; Laramie County, Wyoming

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 9, 2021, 2:51 PM MDT for Banner County, Kimball County, Nebraska; Laramie County, Wyoming. It was in force for 39 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: Jul 9, 2021, 2:51 PM MDT (20:51 UTC)
Expired: Jul 9, 2021, 3:30 PM MDT
In force: 39 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Banner County, NE, Kimball County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 63 km from the middle of the area, began a volume at 20:52 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
Jul 9, 3:00 PM MDT	HAIL 0.75	4 S Albin, WY
Jul 9, 3:20 PM MDT	HAIL 1	1 Ne Bushnell, NE
Jul 9, 3:29 PM MDT	HAIL 1.75	5 E Bushnell, NE	REPORTED AT OLIVER RESEVOIR EAST OF BUSHNELL. ESTIMATED TIME.

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
Jul 9, 2:16 PM MDT	Severe Thunderstorm Watch	SPC	9 hr

The nearest sounding before it

Denver, CO (KDNR), launched 12:00Z, 8.9 hours before the alert went out and 174 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: 5 J/kg
Mixed-layer CIN: -346 J/kg
Mixed-layer LCL: 3383 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 70 m²/s²
0-3 km storm-relative helicity: 50 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

425 
WUUS55 KCYS 092051
SVRCYS
NEC007-105-WYC021-092130-
/O.NEW.KCYS.SV.W.0084.210709T2051Z-210709T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
251 PM MDT Fri Jul 9 2021

The National Weather Service in Cheyenne has issued a

* Severe Thunderstorm Warning for...
  Western Kimball County in the Panhandle of Nebraska...
  Southwestern Banner County in the Panhandle of Nebraska...
  East central Laramie County in southeastern Wyoming...

* Until 330 PM MDT.

* At 251 PM MDT, a severe thunderstorm was located near Albin, or 29
  miles west of Kimball, moving southeast at 25 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Pine Bluffs, Albin, Oliver Campground, Oliver Reservoir and
  Bushnell.

This includes the following highways...
 Interstate 80 in Wyoming between mile markers 401 and 402.
 Interstate 80 in Nebraska between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4139 10434 4149 10420 4137 10380 4106 10376
      4107 10399
TIME...MOT...LOC 2051Z 310DEG 22KT 4136 10420 

HAIL...1.25IN
WIND...60MPH
 
$$

Hammer

1 follow-up statement

025 
WWUS55 KCYS 092115
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
315 PM MDT Fri Jul 9 2021

WYC021-092125-
/O.CAN.KCYS.SV.W.0084.000000T0000Z-210709T2130Z/
Laramie WY-
315 PM MDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL LARAMIE COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 900 PM MDT for
the Panhandle of Nebraska.

LAT...LON 4116 10404 4144 10404 4137 10380 4106 10376
TIME...MOT...LOC 2115Z 306DEG 23KT 4128 10399 

$$

NEC007-105-092130-
/O.CON.KCYS.SV.W.0084.000000T0000Z-210709T2130Z/
Kimball NE-Banner NE-
315 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 330 PM MDT
FOR WESTERN KIMBALL AND SOUTHWESTERN BANNER COUNTIES...

At 315 PM MDT, a severe thunderstorm was located 8 miles northeast of
Pine Bluffs, or 17 miles west of Kimball, moving southeast at 25 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Oliver Reservoir, Oliver Campground and Bushnell. 

This includes Interstate 80 in Nebraska between mile markers 1 and
14.
 
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.

&&

LAT...LON 4116 10404 4144 10404 4137 10380 4106 10376
TIME...MOT...LOC 2115Z 306DEG 23KT 4128 10399 

HAIL...1.25IN
WIND...60MPH
 
$$

Hammer

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:20 PM MDT	Severe Thunderstorm Warning	CYS	Kimball	40 min
Jul 9, 2:58 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Cheyenne, Kimball, Morrill	47 min
Jul 9, 3:32 PM MDT	Special Weather Statement	CYS	Sioux	28 min
Jul 9, 3:37 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	42 min
Jul 9, 3:54 PM MDT	Severe Thunderstorm Warning	CYS	Dawes, Sioux	36 min
Jul 9, 4:30 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes, Sioux	45 min
Jul 9, 5:08 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Dawes	52 min
Jul 9, 5:42 PM MDT	Tornado Warning	CYS	Box Butte	33 min
Jul 9, 5:49 PM MDT	Areal Flood Advisory	CYS	Box Butte, Morrill	3 hr
Jul 9, 5:58 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	47 min
Jul 9, 1:31 PM MDT	Special Weather Statement	CYS	Laramie	29 min
Jul 9, 1:58 PM MDT	Special Weather Statement	CYS	Laramie	32 min
Jul 9, 2:29 PM MDT	Special Weather Statement	CYS	Laramie	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2021 Severe Thunderstorm Warnings in Wyoming, 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.