Alert archive / Nebraska / Tornado Warnings in 2021

Tornado Warning 3, NWS Cheyenne, WY

July 9, 2021Box Butte County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jul 9, 2021, 5:42 PM MDT for Box Butte County, Nebraska. It was in force for 33 min. 1 report 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, 5:42 PM MDT (23:42 UTC)
Expired: Jul 9, 2021, 6:15 PM MDT
In force: 33 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 2.75 in

County Box Butte County, NE

The radar

The Cheyenne radar (KCYS), 170 km from the middle of the area, began a volume at 23:42 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, 6:12 PM MDT	HAIL 3	11 Wsw Alliance, NE	LATE REPORT. HAIL DIAMETER OF 3.5 INCHES SOUTHWEST OF ALLIANCE.

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

Rapid City, SD (KUNR), launched 12:00Z, 11.7 hours before the alert went out and 221 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: 766 J/kg
Mixed-layer CIN: -307 J/kg
Mixed-layer LCL: 1363 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 117 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

732 
WFUS55 KCYS 092342
TORCYS
NEC013-100015-
/O.NEW.KCYS.TO.W.0003.210709T2342Z-210710T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Cheyenne WY
542 PM MDT Fri Jul 9 2021

The National Weather Service in Cheyenne has issued a

* Tornado Warning for...
  Southwestern Box Butte County in the Panhandle of Nebraska...

* Until 615 PM MDT.
    
* At 542 PM MDT, a severe thunderstorm capable of producing a tornado
  was located near Kilpatrick Lake, or 19 miles west of Alliance,
  moving southeast at 30 mph.

  HAZARD...Tornado and baseball size hail.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* This dangerous storm will be near...
  Kilpatrick Lake around 550 PM MDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4200 10324 4218 10338 4228 10322 4201 10287
TIME...MOT...LOC 2342Z 321DEG 25KT 4217 10324 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Brothers

2 follow-up statements

802 
WWUS55 KCYS 092352
SVSCYS

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

NEC013-100015-
/O.CON.KCYS.TO.W.0003.000000T0000Z-210710T0015Z/
Box Butte NE-
552 PM MDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR
SOUTHWESTERN BOX BUTTE COUNTY...
    
At 551 PM MDT, a severe thunderstorm capable of producing a tornado
was located near Kilpatrick Lake, or 15 miles west of Alliance,
moving southeast at 30 mph.

HAZARD...Tornado and baseball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
southwestern Box Butte County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4215 10336 4224 10321 4201 10287 4200 10324
TIME...MOT...LOC 2351Z 321DEG 25KT 4212 10318 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Brothers

046 
WWUS55 KCYS 100000
SVSCYS

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

NEC013-100015-
/O.CON.KCYS.TO.W.0003.000000T0000Z-210710T0015Z/
Box Butte NE-
600 PM MDT Fri Jul 9 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM MDT FOR SOUTH
CENTRAL BOX BUTTE COUNTY...
    
At 600 PM MDT, a severe thunderstorm capable of producing a tornado
was located 8 miles east of Kilpatrick Lake, or 13 miles west of
Alliance, moving southeast at 30 mph.

HAZARD...Tornado and baseball size hail.

SOURCE...Radar indicated rotation.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be damaged or destroyed. Damage 
         to roofs, windows, and vehicles will occur.  Tree damage is 
         likely.

This tornadic thunderstorm will remain over mainly rural areas of
south central Box Butte County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4210 10328 4217 10316 4201 10293 4200 10324
TIME...MOT...LOC 0000Z 321DEG 25KT 4207 10313 

TORNADO...RADAR INDICATED
HAIL...2.75IN

$$

Brothers

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, 2:51 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, 5:49 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

Nearby

Tornado Warnings in Nebraska, 2021 Every tornado warning in 2021 Tornadoes 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.