Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 14, NWS Cheyenne, WY

June 25, 2011Cheyenne County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 25, 2011, 8:13 PM MDT for Cheyenne County, Nebraska. It was in force for 32 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: Jun 25, 2011, 8:13 PM MDT (02:13 UTC)
Expired: Jun 25, 2011, 8:45 PM MDT
In force: 32 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 165 km from the middle of the area, began a volume at 02:13 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
Jun 25, 8:20 PM MDT	HAIL 2.75	Sidney, NE	NUMEROUS REPORTS OF GOLFBALL SIZED HAIL IN AND AROUND SIDNEY. BASEBALL SIZED HAIL WAS REPORTED ON THE NORTH SIDE OF TOWN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.2 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: 395 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 3421 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 24 m²/s²
0-3 km storm-relative helicity: 153 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.8

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

046 
WFUS55 KCYS 260213
TORCYS
NEC033-260245-
/O.NEW.KCYS.TO.W.0014.110626T0213Z-110626T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
813 PM MDT SAT JUN 25 2011

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN CHEYENNE COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 845 PM MDT

* AT 808 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS
  DANGEROUS STORM WAS LOCATED NEAR SIDNEY...AND MOVING SOUTHEAST AT
  20 MPH.  LARGE HAIL IS BEING PRODUCED BY THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  SIDNEY...SIDNEY AIRPORT...COLTON...SUNOL...I-80 EXIT 69 AND I-80
  EXIT 76.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 54 AND
76.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4099 10271 4099 10292 4111 10309 4123 10298
      4111 10262
TIME...MOT...LOC 0211Z 301DEG 16KT 4113 10300

$$

RE

2 follow-up statements

847 
WWUS55 KCYS 260226
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
826 PM MDT SAT JUN 25 2011

NEC033-260245-
/O.CON.KCYS.TO.W.0014.000000T0000Z-110626T0245Z/
CHEYENNE NE-
826 PM MDT SAT JUN 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN CHEYENNE
COUNTY UNTIL 845 PM MDT...

AT 822 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR SIDNEY...MOVING SOUTHEAST AT 20 MPH.

IN ADDITION...HAIL UP TO BASEBALL SIZE HAS BEEN REPORTED WITH THIS 
STORM.

LOCATIONS IMPACTED INCLUDE...
  SIDNEY...COLTON...SUNOL AND I-80 EXIT 69.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4099 10271 4099 10292 4111 10309 4123 10298
      4111 10262
TIME...MOT...LOC 0225Z 301DEG 16KT 4112 10292

$$

RE

363 
WWUS55 KCYS 260245
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
845 PM MDT SAT JUN 25 2011

NEC033-260254-
/O.EXP.KCYS.TO.W.0014.000000T0000Z-110626T0245Z/
CHEYENNE NE-
845 PM MDT SAT JUN 25 2011

...THE TORNADO WARNING FOR SOUTHEASTERN CHEYENNE COUNTY WILL EXPIRE
AT 845 PM MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING IS NOW IN EFFECT 
FOR SOUTHEASTERN CHEYENNE COUNTY UNTIL 930 PM MDT.

LAT...LON 4099 10271 4099 10292 4111 10309 4123 10298
      4111 10262
TIME...MOT...LOC 0244Z 301DEG 16KT 4108 10282

$$

RE

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 25, 6:45 PM MDT	Tornado Warning	CYS	Banner, Kimball	30 min
Jun 25, 7:11 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne, Kimball	23 min
Jun 25, 7:12 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Sioux	46 min
Jun 25, 7:24 PM MDT	Tornado Warning	CYS	Cheyenne	36 min
Jun 25, 7:47 PM MDT	Tornado Warning	CYS	Cheyenne	28 min
Jun 25, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Scotts Bluff, Sioux	48 min
Jun 25, 8:43 PM MDT	Severe Thunderstorm Warning	CYS	Cheyenne	47 min
Jun 26, 9:02 AM MDT	Severe Thunderstorm Warning	CYS	Dawes	40 min
Jun 26, 4:39 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	35 min

Nearby

Tornado Warnings in Nebraska, 2011 Every tornado warning in 2011 Tornadoes in 2011

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.