Alert archive / Nebraska / Tornado Warnings in 2012

Tornado Warning 11, NWS Cheyenne, WY

June 22, 2012Dawes County, Sioux County, Nebraska

NWS Cheyenne, WY issued this tornado warning at Jun 22, 2012, 8:10 PM MDT for Dawes County, Sioux County, Nebraska. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Jun 22, 2012, 8:10 PM MDT (02:10 UTC)
Expired
Jun 22, 2012, 8:45 PM MDT
In force
35 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon

Counties Dawes County, NE, Sioux County, NE

The radar

The Rapid City radar (KUDX), 144 km from the middle of the area, began a volume at 02:09 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.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jun 22, 3:52 PM MDTSevere Thunderstorm WatchSPC9 hr

The nearest sounding before it

Rapid City, SD (KUNR), 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-pSkew-T log-p diagram, Rapid City, SD at 00:00Z on 2012-06-23Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2140 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 00:00Z on 2012-06-23The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 21 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
2140 J/kg
Mixed-layer CIN
-85 J/kg
Mixed-layer LCL
2194 m above ground
0-6 km bulk shear
41 kt
0-1 km storm-relative helicity
21 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.8

Open this sounding in Storm Lab

The text

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

084 
WFUS55 KCYS 230210
TORCYS
NEC045-165-230245-
/O.NEW.KCYS.TO.W.0011.120623T0210Z-120623T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
810 PM MDT FRI JUN 22 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHWESTERN DAWES COUNTY IN THE PANHANDLE OF NEBRASKA...
  NORTH CENTRAL SIOUX COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 845 PM MDT

* AT 806 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 12
  MILES NORTH OF MONTROSE...OR 17 MILES SOUTHEAST OF EDGEMONT.
  DOPPLER RADAR SHOWED THIS TORNADO MOVING SOUTHEAST AT 30 MPH.

  AT 805 PM MDT...A TORNADO WAS REPORTED NEAR RUMFORD...MOVING       
  SOUTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WHITNEY LAKE...CHADRON AIRPORT AND WHITNEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT...EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

&&

LAT...LON 4265 10323 4300 10384 4301 10381 4301 10302
      4299 10296
TIME...MOT...LOC 0209Z 304DEG 28KT 4307 10362

$$

TJT
2 follow-up statements
590 
WWUS55 KCYS 230224
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
824 PM MDT FRI JUN 22 2012

NEC045-165-230245-
/O.CON.KCYS.TO.W.0011.000000T0000Z-120623T0245Z/
DAWES NE-SIOUX NE-
824 PM MDT FRI JUN 22 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTH CENTRAL SIOUX AND
NORTHWESTERN DAWES COUNTIES UNTIL 845 PM MDT...

AT 820 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO.  THIS 
TORNADO WAS MOVING SOUTHEAST AT 25 MPH.

AT 821 PM MDT...A TORNADO WAS REPORTED ON THE GROUND 6 MILES NORTH 
OF ARDMORE SOUTH DAKOTA. THIS TORNADO IS MOVING SOUTHEAST AT 25 MPH. 
 
LOCATIONS IMPACTED INCLUDE...
  WHITNEY LAKE...CHADRON AIRPORT AND WHITNEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

&&

LAT...LON 4265 10323 4300 10384 4301 10381 4301 10302
      4299 10296
TIME...MOT...LOC 0222Z 304DEG 28KT 4301 10351

$$

TJT
093 
WWUS55 KCYS 230237
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
837 PM MDT FRI JUN 22 2012

NEC165-230245-
/O.CAN.KCYS.TO.W.0011.000000T0000Z-120623T0245Z/
SIOUX NE-
837 PM MDT FRI JUN 22 2012

...THE TORNADO WARNING FOR NORTH CENTRAL SIOUX COUNTY IS CANCELLED...

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

LAT...LON 4279 10327 4296 10351 4301 10350 4301 10305
      4299 10296
TIME...MOT...LOC 0235Z 298DEG 24KT 4300 10343

$$

NEC045-230245-
/O.CON.KCYS.TO.W.0011.000000T0000Z-120623T0245Z/
DAWES NE-
837 PM MDT FRI JUN 22 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN DAWES COUNTY
UNTIL 845 PM MDT...

AT 833 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR AND STORM
SPOTTERS WERE TRACKING A LARGE AND EXTREMELY DANGEROUS TORNADO.  THIS
TORNADO WAS LOCATED 5 MILES NORTHEAST OF ARDMORE SOUTH DAKOTA...OR 
26 MILES NORTHWEST OF CHADRON...MOVING EAST-SOUTHEAST AT 25 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF EXTREME NORTHWESTERN DAWES COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOTORISTS SHOULD NOT TAKE SHELTER UNDER HIGHWAY OVERPASSES. AS A LAST
RESORT... EITHER PARK YOUR VEHICLE AND STAY PUT...OR ABANDON YOUR
VEHICLE AND LIE DOWN IN A LOW LYING AREA.

&&

LAT...LON 4279 10327 4296 10351 4301 10350 4301 10305
      4299 10296
TIME...MOT...LOC 0235Z 298DEG 24KT 4300 10343

$$

TJT

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 8:49 PM MDTSevere Thunderstorm WarningCYSDawes28 min

Nearby

Tornado Warnings in Nebraska, 2012Every tornado warning in 2012Tornadoes in 2012

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.