Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Cheyenne, WY

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

NWS Cheyenne, WY issued this severe thunderstorm warning at Jul 9, 2021, 2:20 PM MDT for Kimball County, Nebraska; Laramie County, Wyoming. It was in force for 40 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: Jul 9, 2021, 2:20 PM MDT (20:20 UTC)
Expired: Jul 9, 2021, 3:00 PM MDT
In force: 40 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Kimball County, NE, Laramie County, WY

The radar

The Cheyenne radar (KCYS), 61 km from the middle of the area, began a volume at 20:20 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, 2:30 PM MDT	HAIL 1	Pine Bluffs, WY
Jul 9, 2:37 PM MDT	HAIL 1	Pine Bluffs, WY

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, 8.3 hours before the alert went out and 168 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.

109 
WUUS55 KCYS 092020
SVRCYS
NEC105-WYC021-092100-
/O.NEW.KCYS.SV.W.0083.210709T2020Z-210709T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
220 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...
  Southeastern Laramie County in southeastern Wyoming...

* Until 300 PM MDT.

* At 219 PM MDT, a severe thunderstorm was located near Burns, or 25
  miles east of Cheyenne, moving east at 45 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...
  Pine Bluffs, Burns, Oliver Campground, Oliver Reservoir and
  Bushnell.

This includes the following highways...
 Interstate 80 in Wyoming between mile markers 383 and 402.
 Interstate 80 in Nebraska between mile markers 1 and 19.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4123 10444 4140 10385 4139 10373 4107 10365
      4108 10440
TIME...MOT...LOC 2019Z 260DEG 38KT 4119 10430 

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

Hammer

3 follow-up statements

904 
WWUS55 KCYS 092039
SVSCYS

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

NEC105-WYC021-092100-
/O.CON.KCYS.SV.W.0083.000000T0000Z-210709T2100Z/
Kimball NE-Laramie WY-
239 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR WESTERN KIMBALL AND EAST CENTRAL LARAMIE COUNTIES...

At 238 PM MDT, a severe thunderstorm was located near Pine Bluffs, or
15 miles west of Kimball, moving east at 45 mph.

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

SOURCE...Trained weather spotters. Quarter sized hail was reported 
         in Pine Bluffs with this storm.

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

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

This includes the following highways...
 Interstate 80 in Wyoming between mile markers 398 and 402.
 Interstate 80 in Nebraska between mile markers 1 and 19.

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 4140 10385 4139 10373 4107 10365 4108 10412
      4131 10417
TIME...MOT...LOC 2038Z 261DEG 39KT 4119 10396 

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

Hammer

623 
WWUS55 KCYS 092044
SVSCYS

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

WYC021-092054-
/O.CAN.KCYS.SV.W.0083.000000T0000Z-210709T2100Z/
Laramie WY-
244 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 4140 10385 4139 10373 4107 10365 4108 10404
      4134 10404
TIME...MOT...LOC 2044Z 260DEG 38KT 4120 10388 

$$

NEC105-092100-
/O.CON.KCYS.SV.W.0083.000000T0000Z-210709T2100Z/
Kimball NE-
244 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR WESTERN KIMBALL COUNTY...

At 244 PM MDT, a severe thunderstorm was located over Oliver
Campground, or 11 miles west of Kimball, moving east at 45 mph.

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

SOURCE...Trained weather spotters.

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
19.
 
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 4140 10385 4139 10373 4107 10365 4108 10404
      4134 10404
TIME...MOT...LOC 2044Z 260DEG 38KT 4120 10388 

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

Hammer

503 
WWUS55 KCYS 092053
SVSCYS

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

NEC105-092100-
/O.CON.KCYS.SV.W.0083.000000T0000Z-210709T2100Z/
Kimball NE-
253 PM MDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM MDT
FOR NORTHWESTERN KIMBALL COUNTY...

At 253 PM MDT, a severe thunderstorm was located near Oliver
Reservoir, or near Kimball, moving east at 45 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...
Oliver Reservoir and Oliver Campground. 

This includes Interstate 80 in Nebraska between mile markers 11 and
19.
 
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 4140 10385 4139 10373 4118 10368 4116 10384
      4137 10394
TIME...MOT...LOC 2053Z 260DEG 38KT 4122 10375 

HAIL...1.00IN
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, 2:51 PM MDT	Severe Thunderstorm Warning	CYS	Banner, Kimball	39 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.