Alert archive / Nebraska / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 142, NWS Cheyenne, WY

September 11, 2021Cheyenne County, Kimball County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Sep 11, 2021, 7:11 PM MDT for Cheyenne County, Kimball County, Nebraska. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Sep 11, 2021, 7:11 PM MDT (01:11 UTC)
Expired: Sep 11, 2021, 8:00 PM MDT
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Cheyenne County, NE, Kimball County, NE

The radar

The Cheyenne radar (KCYS), 136 km from the middle of the area, began a volume at 01:15 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.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 1.2 hours before the alert went out and 137 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: 403 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 3631 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

130 
WUUS55 KCYS 120111
SVRCYS
NEC033-105-120200-
/O.NEW.KCYS.SV.W.0142.210912T0111Z-210912T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Cheyenne WY
711 PM MDT Sat Sep 11 2021

The National Weather Service in Cheyenne has issued a

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

* Until 800 PM MDT.

* At 709 PM MDT, a severe thunderstorm was located 10 miles west of
  Peetz, or 19 miles southwest of Sidney, moving northeast at 30 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees. Lightweight 
           and high profile vehicles are also at risk for 
           potential blowover.

* Locations impacted include...
  Sidney, Colton, Sunol, Brownson, Sidney Airport and Lorenzo. 

This includes Interstate 80 in Nebraska between mile markers 43 and
71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4109 10351 4134 10291 4111 10272 4100 10300
      4100 10343
TIME...MOT...LOC 0109Z 237DEG 28KT 4100 10330 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cox

3 follow-up statements

690 
WWUS55 KCYS 120125
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
725 PM MDT Sat Sep 11 2021

NEC033-105-120200-
/O.CON.KCYS.SV.W.0142.000000T0000Z-210912T0200Z/
Cheyenne NE-Kimball NE-
725 PM MDT Sat Sep 11 2021

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

At 724 PM MDT, a severe thunderstorm was located near Lorenzo, or 11
miles southwest of Sidney, moving northeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Sidney, Colton, Sunol, Brownson, Sidney Airport and Lorenzo. 

This includes Interstate 80 in Nebraska between mile markers 43 and
71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4109 10351 4134 10291 4111 10272 4100 10300
      4100 10343
TIME...MOT...LOC 0124Z 237DEG 28KT 4107 10317 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cox

871 
WWUS55 KCYS 120143
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
743 PM MDT Sat Sep 11 2021

NEC105-120152-
/O.CAN.KCYS.SV.W.0142.000000T0000Z-210912T0200Z/
Kimball NE-
743 PM MDT Sat Sep 11 2021

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

LAT...LON 4116 10325 4134 10291 4111 10272 4100 10300
      4100 10324
TIME...MOT...LOC 0142Z 237DEG 28KT 4115 10301 

$$

NEC033-120200-
/O.CON.KCYS.SV.W.0142.000000T0000Z-210912T0200Z/
Cheyenne NE-
743 PM MDT Sat Sep 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM MDT
FOR SOUTHERN CHEYENNE COUNTY...

At 742 PM MDT, a severe thunderstorm was located over Sidney, moving
northeast at 30 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Sidney, Colton, Sunol, Brownson, Sidney Airport and Lorenzo. 

This includes Interstate 80 in Nebraska between mile markers 46 and
71.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4116 10325 4134 10291 4111 10272 4100 10300
      4100 10324
TIME...MOT...LOC 0142Z 237DEG 28KT 4115 10301 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Cox

186 
WWUS55 KCYS 120154
SVSCYS

Severe Weather Statement
National Weather Service Cheyenne WY
754 PM MDT Sat Sep 11 2021

NEC033-120204-
/O.EXP.KCYS.SV.W.0142.000000T0000Z-210912T0200Z/
Cheyenne NE-
754 PM MDT Sat Sep 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CHEYENNE COUNTY WILL
EXPIRE AT 800 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.  However gusty
winds up to 50 mph are still possible with this thunderstorm.

LAT...LON 4116 10325 4134 10291 4111 10272 4100 10300
      4100 10324
TIME...MOT...LOC 0154Z 237DEG 28KT 4118 10294 

$$

Cox

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 11, 6:26 PM MDT	Special Weather Statement	CYS	Kimball	49 min
Sep 11, 6:58 PM MDT	Special Weather Statement	CYS	Cheyenne	47 min
Sep 11, 7:40 PM MDT	Special Weather Statement	CYS	Scotts Bluff	50 min
Sep 11, 7:53 PM MDT	Special Weather Statement	CYS	Cheyenne	37 min
Sep 11, 7:59 PM MDT	Special Weather Statement	CYS	Cheyenne	31 min
Sep 11, 8:13 PM MDT	Special Weather Statement	CYS	Box Butte	62 min
Sep 12, 5:08 PM MDT	Special Weather Statement	CYS	Kimball	22 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.