Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 13, NWS Cheyenne, WY

June 25, 2011Cheyenne County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 25, 2011, 7:47 PM MDT for Cheyenne County, Nebraska. It was in force for 28 min. 4 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: Jun 25, 2011, 7:47 PM MDT (01:47 UTC)
Expired: Jun 25, 2011, 8:15 PM MDT
In force: 28 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 148 km from the middle of the area, began a volume at 01:50 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, 7:53 PM MDT	TORNADO	1 Nw Sidney, NE	DEBRIS REPORTED FROM TORNADO JUST OUTSIDE OF TOWN.
Jun 25, 8:07 PM MDT	HAIL 1	Sidney, NE	QUARTER SIZED HAIL ON THE NORTH SIDE OF TOWN. SPOTTER OBSERVED STRONG ROTATION TO THE WEST.
Jun 25, 8:11 PM MDT	HAIL 1.75	Sidney, NE	GOLF BALL SIZED HAIL ON THE WEST SIDE OF TOWN. ONGOING AT THE TIME OF THE REPORT.
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, 1.8 hours before the alert went out and 150 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.

504 
WFUS55 KCYS 260147
TORCYS
NEC033-260215-
/O.NEW.KCYS.TO.W.0013.110626T0147Z-110626T0215Z/

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

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

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

* UNTIL 815 PM MDT

* AT 745 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 6 MILES NORTHWEST OF BROWNSON...OR 12 MILES
  NORTHWEST OF SIDNEY...AND MOVING EAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  SIDNEY...BROWNSON...SIDNEY AIRPORT...I-80 EXIT 48 AND I-80 EXIT 55.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 44 AND
59.

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 4126 10289 4105 10299 4117 10325 4131 10317
TIME...MOT...LOC 0147Z 283DEG 16KT 4121 10317

$$

RE

2 follow-up statements

483 
WWUS55 KCYS 260203
SVSCYS

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

NEC033-260215-
/O.CON.KCYS.TO.W.0013.000000T0000Z-110626T0215Z/
CHEYENNE NE-
803 PM MDT SAT JUN 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR CENTRAL CHEYENNE COUNTY
UNTIL 815 PM MDT...

AT 759 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR BROWNSON...OR 6 MILES NORTHWEST OF 
SIDNEY...MOVING EAST SOUTHEAST AT 20 MPH.  FUNNEL CLOUDS AND SOME 
BLOWING DEBRIS HAS RECENTLY BEEN REPORTED NORTHWEST OF SIDNEY.

LOCATIONS IMPACTED INCLUDE...
  SIDNEY...BROWNSON...SIDNEY AIRPORT AND I-80 EXIT 55.

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 4126 10289 4105 10299 4117 10325 4131 10317
TIME...MOT...LOC 0202Z 283DEG 16KT 4119 10308

$$

RE

529 
WWUS55 KCYS 260215
SVSCYS

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

NEC033-260224-
/O.EXP.KCYS.TO.W.0013.000000T0000Z-110626T0215Z/
CHEYENNE NE-
815 PM MDT SAT JUN 25 2011

...THE TORNADO WARNING FOR CENTRAL CHEYENNE COUNTY WILL EXPIRE AT 815
PM MDT...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA. A NEW TORNADO WARNING IS IN EFFECT FOR SOUTHEASTERN CHEYENNE 
COUNTY INCLUDING THE CITY OF SIDNEY UNTIL UNTIL 845 PM.

LAT...LON 4126 10289 4105 10299 4117 10325 4131 10317
TIME...MOT...LOC 0214Z 283DEG 16KT 4118 10301

$$

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, 7:55 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Scotts Bluff, Sioux	48 min
Jun 25, 8:13 PM MDT	Tornado Warning	CYS	Cheyenne	32 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.