Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 18, NWS North Platte, NE

April 12, 2012Lincoln County, Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Apr 12, 2012, 7:30 PM CDT for Lincoln County, Perkins County, Nebraska. It was in force for 45 min. 5 reports 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: Apr 12, 2012, 7:30 PM CDT (00:30 UTC)
Expired: Apr 12, 2012, 8:15 PM CDT
In force: 45 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Lincoln County, NE, Perkins County, NE

The radar

The North Platte radar (KLNX), 131 km from the middle of the area, began a volume at 00:32 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
Apr 12, 7:42 PM CDT	HAIL 1.75	5 N Grainton, NE	HAIL IN SIZE FROM GOLF BALL TO HALF INCH.
Apr 12, 7:43 PM CDT	HAIL 0.5	8 E Madrid, NE	PEA TO DIME SIZED HAIL COVERING THE GROUND
Apr 12, 7:54 PM CDT	HAIL 1	2 S Wallace, NE	LOCATION ESTIMATED
Apr 12, 8:05 PM CDT	HAIL 1	6 N Wallace, NE	3 INCHES OF HAIL COVERING THE GROUND.
Apr 12, 8:25 PM CDT	HAIL 1	10 N Dickens, NE

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

The watch it was issued in

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

Issued	Product	Office	Lasted
Apr 12, 1:47 PM CDT	Tornado Watch	SPC	7 hr
Apr 12, 6:54 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.5 hours before the alert went out and 61 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: 188 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 487 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 458 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.5

Open this sounding in Storm Lab

The text

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

155 
WUUS53 KLBF 130030
SVRLBF
NEC111-135-130115-
/O.NEW.KLBF.SV.W.0018.120413T0030Z-120413T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
730 PM CDT THU APR 12 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHWESTERN LINCOLN COUNTY IN SOUTHWEST NEBRASKA...
  EASTERN PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 815 PM CDT/715 PM MDT/

* AT 627 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
  HAIL.  THESE STORMS WERE LOCATED ALONG A LINE EXTENDING FROM 10
  MILES NORTHEAST OF ELSIE TO 7 MILES SOUTH OF ELSIE...AND MOVING
  EAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  GRAINTON AROUND 640 PM MDT.
  WALLACE AROUND 750 PM CDT.
  DICKENS AROUND 810 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
HIGHWAY 25 MILE MARKER 90 AND HIGHWAY 25 MILE MARKER 60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR A PORTION OF THE WARNED AREA. 
TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH 
NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED...ACT QUICKLY AND 
MOVE TO A PLACE OF SAFETY INSIDE A STURDY STRUCTURE...SUCH AS A 
BASEMENT OR SMALL INTERIOR ROOM.

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.

&&

LAT...LON 4071 10152 4099 10139 4100 10129 4100 10125
      4101 10125 4107 10090 4070 10097
TIME...MOT...LOC 0030Z 256DEG 26KT 4098 10126 4075 10139
WIND...HAIL <50MPH 1.00IN

$$

STOPPKOTTE

2 follow-up statements

183 
WWUS53 KLBF 130049
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
649 PM MDT THU APR 12 2012

NEC111-135-130115-
/O.CON.KLBF.SV.W.0018.000000T0000Z-120413T0115Z/
LINCOLN NE-PERKINS NE-
749 PM CDT THU APR 12 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN
PERKINS AND SOUTHWESTERN LINCOLN COUNTIES UNTIL 815 PM CDT/715 PM
MDT/...

AT 641 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL.  THIS
STORM WAS LOCATED 8 MILES NORTH OF GRAINTON...OR 25 MILES EAST OF
GRANT...MOVING NORTHEAST AT 30 MPH.

IN ADDITION...AT 744 PM CDT GOLF BALL SIZE HAIL WAS REPORTED 5 MILES 
NORTH OF GRAINTON WITH THIS STORM.

THE SEVERE THUNDERSTORM WILL AFFECT MAINLY RURAL AREAS OF EASTERN
PERKINS AND SOUTHWESTERN LINCOLN COUNTIES...INCLUDING THE FOLLOWING
LOCATIONS HIGHWAY 25 MILE MARKER 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR PERKINS COUNTY IN THE WARNED 
AREA. TORNADOES CAN DEVELOP QUICKLY FROM SEVERE THUNDERSTORMS. 
ALTHOUGH NOT IMMEDIATELY LIKELY...IF A TORNADO IS SPOTTED ACT 
QUICKLY AND MOVE TO A PLACE OF SAFETY INSIDE A STURDY 
STRUCTURE...SUCH AS A BASEMENT OR SMALL INTERIOR ROOM.

THIS STORM HAS A HISTORY OF PRODUCING LARGE HAIL. SEEK SHELTER NOW
INSIDE A STURDY STRUCTURE AND STAY AWAY FROM WINDOWS.

&&

LAT...LON 4071 10152 4099 10139 4100 10129 4100 10125
      4101 10125 4107 10090 4070 10097
TIME...MOT...LOC 0047Z 219DEG 26KT 4097 10123
WIND...HAIL <50MPH 1.75IN

$$

STOPPKOTTE

613 
WWUS53 KLBF 130114
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
814 PM CDT THU APR 12 2012

NEC111-135-130123-
/O.EXP.KLBF.SV.W.0018.000000T0000Z-120413T0115Z/
LINCOLN NE-PERKINS NE-
814 PM CDT THU APR 12 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN PERKINS AND
SOUTHWESTERN LINCOLN COUNTIES WILL EXPIRE AT 815 PM CDT...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE
LIMITS...AND NO LONGER POSES AN IMMEDIATE THREAT TO LIFE OR PROPERTY.
 HOWEVER PENNY SIZE HAIL AND GUSTY WINDS ARE STILL POSSIBLE WITH 
THIS THUNDERSTORM.

HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
WESTERN LINCOLN COUNTY UNTIL 9 PM CDT (8 PM MDT).

LAT...LON 4071 10152 4099 10139 4100 10129 4100 10125
      4101 10125 4107 10090 4070 10097
TIME...MOT...LOC 0113Z 219DEG 26KT 4112 10107

$$

STOPPKOTTE

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 12, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, McPherson, Thomas	45 min
Apr 12, 7:13 PM CDT	Severe Thunderstorm Warning	LBF	Frontier, Hayes	47 min
Apr 12, 8:10 PM CDT	Severe Thunderstorm Warning	LBF	Lincoln	50 min
Apr 12, 9:02 PM CDT	Areal Flood Advisory	LBF	Lincoln	104 min
Apr 13, 5:44 PM CDT	River Flood Warning	LBF	Lincoln	22 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.