Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 3, NWS Cheyenne, WY

April 26, 2012Box Butte County, Nebraska

NWS Cheyenne, WY issued this severe thunderstorm warning at Apr 26, 2012, 4:30 PM MDT for Box Butte County, Nebraska. It was in force for 18 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
Apr 26, 2012, 4:30 PM MDT (22:30 UTC)
Expired
Apr 26, 2012, 4:48 PM MDT
In force
18 min
Issued by
NWS Cheyenne, WY
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

County Box Butte County, NE

The radar

The North Platte radar (KLNX), 185 km from the middle of the area, began a volume at 22:30 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 nearest sounding before it

Rapid City, SD (KUNR), launched 12:00Z, 10.5 hours before the alert went out and 205 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 12:00Z on 2012-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Rapid City, SD at 12:00Z on 2012-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 33 square meters per square second.19395878Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
974 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
33 m²/s²
0-3 km storm-relative helicity
196 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

879 
WUUS55 KCYS 262230
SVRCYS
NEC013-262315-
/O.NEW.KCYS.SV.W.0003.120426T2230Z-120426T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE CHEYENNE WY
430 PM MDT THU APR 26 2012

THE NATIONAL WEATHER SERVICE IN CHEYENNE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EAST CENTRAL BOX BUTTE COUNTY IN THE PANHANDLE OF NEBRASKA...

* UNTIL 515 PM MDT

* AT 427 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  WILD HORSE BUTTE...OR 8 MILES NORTH OF ALLIANCE...AND MOVING EAST
  AT 5 MPH.

* LOCATIONS IMPACTED INCLUDE...
  WILD HORSE BUTTE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 60 MILES PER
HOUR...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR
YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR 
HOME OR BUSINESS. 

TORRENTIAL RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD
TO FLASH FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 4213 10274 4214 10292 4226 10295 4235 10274
      4234 10274 4223 10273
TIME...MOT...LOC 2230Z 255DEG 6KT 4222 10287
WIND...HAIL 60MPH 1.00IN

$$

MAZUR
1 follow-up statement
105 
WWUS55 KCYS 262248
SVSCYS

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE CHEYENNE WY
448 PM MDT THU APR 26 2012

NEC013-262256-
/O.CAN.KCYS.SV.W.0003.000000T0000Z-120426T2315Z/
BOX BUTTE NE-
448 PM MDT THU APR 26 2012

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BOX BUTTE COUNTY
IS CANCELLED...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE 
LIMITS. HOWEVER GUSTY WINDS AND VERY HEAVY RAIN WITH THIS SLOW 
MOVING THUNDERSTORM ARE STILL POSSIBLE. A FLASH FLOOD WARNING 
REMAINS IN EFFECT UNTIL 10 PM MDT.

LAT...LON 4213 10274 4214 10292 4226 10295 4235 10274
      4234 10274 4223 10273
TIME...MOT...LOC 2246Z 255DEG 6KT 4223 10284

$$

MAZUR

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 11:05 AM MDTWind AdvisoryCYSBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more10 hr
Apr 26, 1:51 PM MDTSpecial Weather StatementCYSBox Butte54 min
Apr 26, 2:39 PM MDTWind AdvisoryCYSBanner, Box Butte, Cheyenne, Dawes, Kimball, Morrill and 2 more30 hr
Apr 26, 2:45 PM MDTSpecial Weather StatementCYSBox Butte60 min
Apr 26, 3:27 PM MDTSpecial Weather StatementCYSScotts Bluff63 min
Apr 26, 3:50 PM MDTSevere Thunderstorm WarningCYSBox Butte40 min
Apr 26, 3:58 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill, Scotts Bluff, Sioux62 min
Apr 26, 4:04 PM MDTFlash Flood WarningCYSBox Butte6 hr
Apr 26, 5:01 PM MDTSevere Thunderstorm WarningCYSBox Butte, Morrill, Scotts Bluff, Sioux37 min
Apr 26, 5:02 PM MDTFlash Flood WarningCYSScotts Bluff6 hr
Apr 26, 5:09 PM MDTSpecial Weather StatementCYSBox Butte66 min
Apr 26, 5:35 PM MDTSpecial Weather StatementCYSBox Butte25 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012Every severe thunderstorm warning 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.