Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 196, NWS North Platte, NE

August 11, 2012Brown County, Keya Paha County, Rock County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 11, 2012, 10:45 PM CDT for Brown County, Keya Paha County, Rock County, Nebraska. It was in force for 45 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: Aug 11, 2012, 10:45 PM CDT (03:45 UTC)
Expired: Aug 11, 2012, 11:30 PM CDT
In force: 45 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Brown County, NE, Keya Paha County, NE, Rock County, NE

The radar

The North Platte radar (KLNX), 103 km from the middle of the area, began a volume at 03:45 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

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 3.8 hours before the alert went out and 184 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: 17 J/kg
Mixed-layer CIN: -50 J/kg
Mixed-layer LCL: 2587 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 88 m²/s²
0-3 km storm-relative helicity: 184 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.

992 
WUUS53 KLBF 120345
SVRLBF
NEC017-103-149-120430-
/O.NEW.KLBF.SV.W.0196.120812T0345Z-120812T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1045 PM CDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHERN BROWN COUNTY IN NORTH CENTRAL NEBRASKA...
  KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...
  NORTHWESTERN ROCK COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 1130 PM CDT

* AT 1040 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DESTRUCTIVE WINDS
  IN EXCESS OF 70 MPH.  THESE STORMS WERE LOCATED ALONG A LINE
  EXTENDING FROM 13 MILES NORTH OF NORTH RIVER TRAIL TO 7 MILES WEST
  OF JOHNSTOWN...AND MOVING EAST AT 35 MPH. PENNY SIZE HAIL MAY ALSO
  ACCOMPANY THESE DAMAGING WINDS.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  JOHNSTOWN AROUND 1050 PM CDT.
  BOBCAT STATE WILDLIFE MANAGEMENT AREA AROUND 1100 PM CDT.
  SPRINGVIEW AND AINSWORTH AROUND 1105 PM CDT.
  BURTON...THOMAS CREEK STATE WILDLIFE MANAGEMENT AREA AND KELLER
  PARK STATE RECREATION AREA AROUND 1110 PM CDT.
  LONG PINE AROUND 1120 PM CDT.
  MILLS AROUND 1125 PM CDT.
  BASSETT AROUND 1130 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
HIGHWAY 12 MILE MARKER 40...HIGHWAY 183 MILE MARKER 220...HIGHWAY 7
MILE MARKER 40...HIGHWAY 137 MILE MARKER 20 AND HIGHWAY 137 MILE
MARKER 10.

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. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

IF YOU ARE IN THE PATH OF THESE STORMS...PREPARE IMMEDIATELY FOR
LARGE HAIL AND DAMAGING WINDS. PEOPLE OUTSIDE SHOULD MOVE TO A
SHELTER...PREFERABLY INSIDE A STRONG BUILDING AND AWAY FROM WINDOWS.

&&

LAT...LON 4238 9943 4256 10018 4261 10019 4301 10004
      4300 9926
TIME...MOT...LOC 0345Z 283DEG 32KT 4296 9990 4260 10012
WIND...HAIL 70MPH 0.75IN

$$

TAYLOR

2 follow-up statements

809 
WWUS53 KLBF 120409
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1109 PM CDT SAT AUG 11 2012

NEC017-103-149-120430-
/O.CON.KLBF.SV.W.0196.000000T0000Z-120812T0430Z/
BROWN NE-KEYA PAHA NE-ROCK NE-
1109 PM CDT SAT AUG 11 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR NORTHWESTERN
ROCK...KEYA PAHA AND NORTHERN BROWN COUNTIES UNTIL 1130 PM CDT...

AT 1108 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING DAMAGING WINDS IN
EXCESS OF 60 MPH.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING
FROM BURTON TO THOMAS CREEK STATE WILDLIFE MANAGEMENT AREA TO
AINSWORTH...MOVING EAST AT 35 MPH. PENNY SIZE HAIL MAY ALSO ACCOMPANY
THESE DAMAGING WINDS.

SEVERE THUNDERSTORMS WILL BE NEAR...
  BURTON AROUND 1115 PM CDT.
  LONG PINE AROUND 1120 PM CDT.
  BASSETT AROUND 1125 PM CDT.
  MILLS AROUND 1130 PM CDT.

OTHER LOCATIONS IMPACTED BY SEVERE THUNDERSTORMS INCLUDE HIGHWAY 137
MILE MARKER 10 AND HIGHWAY 137 MILE MARKER 20.

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. HEAVY RAINS FLOOD ROADS QUICKLY SO DO NOT DRIVE
INTO AREAS WHERE WATER COVERS THE ROAD.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NORTH PLATTE.

&&

LAT...LON 4238 9943 4256 10018 4261 10019 4301 10004
      4300 9926
TIME...MOT...LOC 0409Z 283DEG 32KT 4292 9965 4272 9963
          4256 9984
WIND...HAIL 60MPH 0.75IN

$$

TAYLOR

301 
WWUS53 KLBF 120423
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1123 PM CDT SAT AUG 11 2012

NEC017-103-149-120433-
/O.EXP.KLBF.SV.W.0196.000000T0000Z-120812T0430Z/
BROWN NE-KEYA PAHA NE-ROCK NE-
1123 PM CDT SAT AUG 11 2012

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ROCK...KEYA PAHA
AND NORTHERN BROWN COUNTIES WILL EXPIRE AT 1130 PM CDT/1030 PM
MDT/...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED BELOW
SEVERE LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR
PROPERTY.  HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL POSSIBLE WITH
THESE THUNDERSTORMS.

TO REPORT SEVERE WEATHER...CONTACT YOUR NEAREST LAW ENFORCEMENT
AGENCY. THEY WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE
IN NORTH PLATTE.

LAT...LON 4238 9943 4256 10018 4261 10019 4301 10004
      4300 9926
TIME...MOT...LOC 0423Z 283DEG 32KT 4289 9948 4269 9947
          4253 9968

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:17 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Garden	43 min
Aug 11, 7:46 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Garden, Keith, Perkins	44 min
Aug 11, 8:53 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	37 min
Aug 11, 9:29 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	46 min
Aug 11, 10:06 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha	39 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2012 Every 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.