Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 12, NWS Cheyenne, WY

June 25, 2011Cheyenne County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 25, 2011, 7:24 PM MDT for Cheyenne County, Nebraska. It was in force for 36 min. 5 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, 7:24 PM MDT (01:24 UTC)
Expired
Jun 25, 2011, 8:00 PM MDT
In force
36 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon

County Cheyenne County, NE

The radar

The Cheyenne radar (KCYS), 126 km from the middle of the area, began a volume at 01:27 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

TimeReportWhereRemark
Jun 25, 7:25 PM MDTTSTM WND DMG3 W Potter, NESEMI BLOWN OVER ON INTERSTATE 80 JUST INSIDE CHEYENNE COUNTY LINE.
Jun 25, 7:25 PM MDTTORNADO3 W Potter, NESEMI BLOWN OVER ON INTERSTATE 80 JUST INSIDE CHEYENNE COUNTY LINE. DAMAGE CAUSED BY APPARENT TORNADO.
Jun 25, 7:28 PM MDTTORNADO3 W Potter, NETWO ROPE TORNADOES.
Jun 25, 7:30 PM MDTTSTM WND DMGPotter, NETWO LARGE TREES DOWN IN POTTER DUE TO STRONG WINDS.
Jun 25, 7:44 PM MDTHAIL 0.54 E Potter, NEALSO HEAVY RAIN AND GUSTY WIND.

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, 1.4 hours before the alert went out and 154 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-pSkew-T log-p diagram, Denver, CO at 00:00Z on 2011-06-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 395 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Denver, CO at 00:00Z on 2011-06-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
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.

342 
WFUS55 KCYS 260124
TORCYS
NEC033-260200-
/O.NEW.KCYS.TO.W.0012.110626T0124Z-110626T0200Z/

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

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

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

* UNTIL 800 PM MDT

* AT 718 PM MDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO NEAR
  POTTER...OR 16 MILES EAST OF KIMBALL. DOPPLER RADAR SHOWED THIS
  TORNADO MOVING EAST SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  POTTER AND I-80 EXIT 38.

THIS INCLUDES INTERSTATE 80 IN NEBRASKA BETWEEN MILE MARKERS 36 AND
46.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TO REPEAT...A TORNADO IS ON THE GROUND. 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 4121 10338 4132 10338 4135 10337 4130 10311
      4113 10321
TIME...MOT...LOC 0123Z 292DEG 13KT 4127 10333

$$

RE
2 follow-up statements
443 
WWUS55 KCYS 260140
SVSCYS

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

NEC033-260200-
/O.CON.KCYS.TO.W.0012.000000T0000Z-110626T0200Z/
CHEYENNE NE-
740 PM MDT SAT JUN 25 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR WEST CENTRAL CHEYENNE
COUNTY UNTIL 800 PM MDT...

AT 736 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR POTTER...OR 17 MILES NORTHWEST OF 
SIDNEY...MOVING EAST SOUTHEAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF WESTERN CHEYENNE COUNTY.

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 4121 10338 4132 10338 4135 10337 4130 10311
      4113 10321
TIME...MOT...LOC 0140Z 292DEG 13KT 4124 10325

$$

RE
284 
WWUS55 KCYS 260152
SVSCYS

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

NEC033-260201-
/O.EXP.KCYS.TO.W.0012.000000T0000Z-110626T0200Z/
CHEYENNE NE-
752 PM MDT SAT JUN 25 2011

...THE TORNADO WARNING FOR WEST CENTRAL CHEYENNE COUNTY WILL EXPIRE
AT 800 PM MDT...

THE STORM WHICH PROMPTED THE WARNING IS MOVING OUT OF THE WARNED 
AREA. A TORNADO WARNING IS IN EFFECT FOR CENTRAL CHEYENNE COUNTY
UNTIL 815 PM.

LAT...LON 4121 10338 4132 10338 4135 10337 4130 10311
      4113 10321
TIME...MOT...LOC 0151Z 292DEG 13KT 4122 10320

$$

RE

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 25, 6:45 PM MDTTornado WarningCYSBanner, Kimball30 min
Jun 25, 7:11 PM MDTSevere Thunderstorm WarningCYSCheyenne, Kimball23 min
Jun 25, 7:12 PM MDTSevere Thunderstorm WarningCYSBox Butte, Sioux46 min
Jun 25, 7:47 PM MDTTornado WarningCYSCheyenne28 min
Jun 25, 7:55 PM MDTSevere Thunderstorm WarningCYSBox Butte, Scotts Bluff, Sioux48 min
Jun 25, 8:13 PM MDTTornado WarningCYSCheyenne32 min
Jun 25, 8:43 PM MDTSevere Thunderstorm WarningCYSCheyenne47 min
Jun 26, 9:02 AM MDTSevere Thunderstorm WarningCYSDawes40 min
Jun 26, 4:39 PM MDTSevere Thunderstorm WarningCYSDawes35 min

Nearby

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