Alert archive / Nebraska / Tornado Warnings in 2012

Tornado Warning 26, NWS North Platte, NE

August 2, 2012Deuel County, Perkins County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 2, 2012, 6:40 PM MDT for Deuel County, Perkins County, Nebraska. It was in force for 25 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
Aug 2, 2012, 6:40 PM MDT (00:40 UTC)
Expired
Aug 2, 2012, 7:05 PM MDT
In force
25 min
Issued by
NWS North Platte, NE
Area
Storm-based polygon

Counties Deuel County, NE, Perkins County, NE

The radar

The North Platte radar (KLNX), 166 km from the middle of the area, began a volume at 00:41 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
Aug 2, 7:04 PM MDTHAIL 1.259 N Venango, NE

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

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 125 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, N. Platte/Lee Bi, NE at 00:00Z on 2012-08-03Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1601 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, N. Platte/Lee Bi, NE at 00:00Z on 2012-08-03The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -23 square meters per square second.193958Sfc1 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
1601 J/kg
Mixed-layer CIN
-46 J/kg
Mixed-layer LCL
2010 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
-23 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

The text

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

700 
WFUS53 KLBF 030040
TORLBF
NEC049-135-030115-
/O.NEW.KLBF.TO.W.0026.120803T0040Z-120803T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
640 PM MDT THU AUG 2 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN DEUEL COUNTY IN THE PANHANDLE OF NEBRASKA...
  NORTHWESTERN PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 715 PM MDT

* AT 636 PM MDT...TRAINED WEATHER SPOTTERS REPORTED A TORNADO NEAR
  GOLDENEYE STATE WILDLIFE MANAGEMENT AREA...OR 5 MILES SOUTHWEST OF
  BIG SPRINGS. DOPPLER RADAR SHOWED THIS TORNADO MOVING EAST AT 15
  MPH.

* LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHWESTERN PERKINS AND SOUTHEASTERN DEUEL
  COUNTIES.

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 4105 10223 4103 10205 4101 10205 4100 10183
      4080 10193 4086 10206 4099 10206 4100 10225
TIME...MOT...LOC 0040Z 289DEG 12KT 4101 10213

$$

SPRINGER
2 follow-up statements
959 
WWUS53 KLBF 030059
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
759 PM CDT THU AUG 2 2012

NEC049-030109-
/O.CAN.KLBF.TO.W.0026.000000T0000Z-120803T0115Z/
DEUEL NE-
659 PM MDT THU AUG 2 2012

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

THE STORM WHICH PROMPTED THE WARNING HAS MOVED OUT OF DEUEL COUNTY.

LAT...LON 4086 10206 4099 10206 4101 10205 4101 10203
      4100 10202 4100 10193 4100 10183 4080 10193
TIME...MOT...LOC 0059Z 289DEG 12KT 4099 10205

$$

NEC135-030115-
/O.CON.KLBF.TO.W.0026.000000T0000Z-120803T0115Z/
PERKINS NE-
659 PM MDT THU AUG 2 2012

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHWESTERN PERKINS
COUNTY UNTIL 715 PM MDT...

AT 655 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR GOLDENEYE STATE WILDLIFE MANAGEMENT AREA...OR
NEAR BIG SPRINGS...MOVING EAST AT 15 MPH.

LOCATIONS IMPACTED INCLUDE...
  MAINLY RURAL AREAS OF NORTHWESTERN PERKINS 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 4086 10206 4099 10206 4101 10205 4101 10203
      4100 10202 4100 10193 4100 10183 4080 10193
TIME...MOT...LOC 0059Z 289DEG 12KT 4099 10205

$$

SPRINGER
720 
WWUS53 KLBF 030105
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
805 PM CDT THU AUG 2 2012

NEC135-030115-
/O.CAN.KLBF.TO.W.0026.000000T0000Z-120803T0115Z/
PERKINS NE-
705 PM MDT THU AUG 2 2012

...THE TORNADO WARNING FOR NORTHWESTERN PERKINS COUNTY IS
CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.

REMEMBER...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHWEST PERKINS 
COUNTY UNTIL 730 PM MDT.

LAT...LON 4086 10206 4099 10206 4101 10205 4101 10203
      4100 10202 4100 10193 4100 10183 4080 10193
TIME...MOT...LOC 0105Z 289DEG 12KT 4098 10202

$$

SPRINGER

The office that day

Everything else NWS North Platte, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 2, 6:00 PM MDTTornado WarningLBFDeuel30 min
Aug 2, 6:27 PM MDTSevere Thunderstorm WarningLBFDeuel, Keith, Perkins30 min
Aug 2, 6:55 PM MDTSevere Thunderstorm WarningLBFPerkins49 min
Aug 2, 7:04 PM MDTTornado WarningLBFPerkins26 min
Aug 2, 7:30 PM MDTSevere Thunderstorm WarningLBFChase, Perkins45 min
Aug 3, 12:19 AM MDTSevere Thunderstorm WarningLBFBoyd, Brown, Holt, Keya Paha, Rock56 min
Aug 3, 4:53 PM MDTSevere Thunderstorm WarningLBFBoyd, Keya Paha67 min
Aug 3, 5:40 PM MDTSevere Thunderstorm WarningLBFBrown, Rock65 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.