Alert archive / Nebraska / Tornado Warnings in 2013

Tornado Warning 13, NWS Cheyenne, WY

June 11, 2013Box Butte County, Morrill County, Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 11, 2013, 8:25 PM MDT for Box Butte County, Morrill County, Sioux County, Nebraska. It was in force for 35 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 11, 2013, 8:25 PM MDT (02:25 UTC)
Expired: Jun 11, 2013, 9:00 PM MDT
In force: 35 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.25 in

Counties Box Butte County, NE, Morrill County, NE, Sioux County, NE

The radar

The Cheyenne radar (KCYS), 162 km from the middle of the area, began a volume at 02:25 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 11, 8:40 PM MDT	TORNADO	10 W Kilpatrick Lake, NE	RAPIDLY SPINNING WALL CLOUD AS WELL.

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 2.4 hours before the alert went out and 226 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: 1471 J/kg
Mixed-layer CIN: -72 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 190 m²/s²
0-3 km storm-relative helicity: 323 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 9.4

Open this sounding in Storm Lab

The text

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

884 
WFUS55 KCYS 120225
TORCYS
NEC013-123-165-120300-
/O.NEW.KCYS.TO.W.0013.130612T0225Z-130612T0300Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
825 PM MDT TUE JUN 11 2013

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA...
  NORTHWESTERN MORRILL COUNTY IN THE PANHANDLE OF NEBRASKA...
  SOUTHEASTERN SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 900 PM MDT

* AT 821 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED NEAR KILPATRICK LAKE...AND MOVING EAST AT 25
  MPH.

  HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

  SOURCE...RADAR INDICATED ROTATION.

  IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
           ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS
           WILL BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS
           LIKELY.

* LOCATIONS IMPACTED INCLUDE...
  KILPATRICK LAKE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS TORNADO WARNING REPLACES THE SEVERE THUNDERSTORM WARNING THAT
WAS IN EFFECT FOR THE SAME AREA.

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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN
CHEYENNE.

&&

LAT...LON 4192 10314 4204 10353 4224 10350 4217 10306
TIME...MOT...LOC 0225Z 287DEG 22KT 4208 10335

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

FINCH

2 follow-up statements

326 
WWUS55 KCYS 120243
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
843 PM MDT TUE JUN 11 2013

NEC165-120252-
/O.CAN.KCYS.TO.W.0013.000000T0000Z-130612T0300Z/
SIOUX NE-
843 PM MDT TUE JUN 11 2013

...THE TORNADO WARNING FOR SOUTHEASTERN SIOUX COUNTY IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF THE WARNED 
AREA.

LAT...LON 4192 10314 4200 10340 4205 10341 4221 10339
      4217 10306
TIME...MOT...LOC 0242Z 287DEG 22KT 4205 10322

$$

NEC013-123-120300-
/O.CON.KCYS.TO.W.0013.000000T0000Z-130612T0300Z/
BOX BUTTE NE-MORRILL NE-
843 PM MDT TUE JUN 11 2013

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN MORRILL AND
SOUTHERN BOX BUTTE COUNTIES UNTIL 900 PM MDT...

AT 839 PM MDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR KILPATRICK LAKE...AND MOVING EAST AT 25 MPH.

HAZARD...TORNADO AND HALF DOLLAR SIZE HAIL.

SOURCE...RADAR INDICATED ROTATION.

IMPACT...MOBILE HOMES WILL BE DAMAGED OR DESTROYED. DAMAGE TO
         ROOFS...WINDOWS AND VEHICLES WILL OCCUR. FLYING DEBRIS WILL
         BE DEADLY TO PEOPLE AND ANIMALS. TREE DAMAGE IS LIKELY.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHERN MORRILL AND SOUTHERN BOX
  BUTTE COUNTIES.

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.

TO REPORT SEVERE WEATHER CONTACT YOUR NEAREST LAW ENFORCEMENT AGENCY.
THEY WILL SEND YOUR REPORT TO THE NATIONAL WEATHER SERVICE IN
CHEYENNE.

&&

LAT...LON 4192 10314 4200 10340 4205 10341 4221 10339
      4217 10306
TIME...MOT...LOC 0242Z 287DEG 22KT 4205 10322

TORNADO...RADAR INDICATED
HAIL...1.25IN

$$

FINCH

327 
WWUS55 KCYS 120259
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
859 PM MDT TUE JUN 11 2013

NEC013-123-120309-
/O.EXP.KCYS.TO.W.0013.000000T0000Z-130612T0300Z/
BOX BUTTE NE-MORRILL NE-
859 PM MDT TUE JUN 11 2013

...THE TORNADO WARNING FOR NORTHWESTERN MORRILL AND SOUTHWESTERN BOX
BUTTE COUNTIES WILL EXPIRE AT 900 PM MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT 
FOR THE AREA.

LAT...LON 4192 10314 4200 10340 4205 10341 4221 10339
      4217 10306
TIME...MOT...LOC 0259Z 287DEG 22KT 4202 10309

$$

FINCH

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 11, 7:29 PM MDT	Special Weather Statement	CYS	Sioux	31 min
Jun 11, 7:53 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Sioux	37 min
Jun 11, 8:32 PM MDT	Severe Thunderstorm Warning	CYS	Dawes	43 min
Jun 11, 8:51 PM MDT	Tornado Warning Tornado observed	CYS	Dawes	24 min
Jun 11, 8:57 PM MDT	Severe Thunderstorm Warning	CYS	Box Butte, Morrill	48 min

Nearby

Tornado Warnings in Nebraska, 2013 Every tornado warning in 2013 Tornadoes in 2013

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.