Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 172, NWS North Platte, NE

August 2, 2012Perkins County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 2, 2012, 6:55 PM MDT for Perkins County, Nebraska. It was in force for 49 min. 2 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: Aug 2, 2012, 6:55 PM MDT (00:55 UTC)
Expired: Aug 2, 2012, 7:44 PM MDT
In force: 49 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.75 in
Wind: 70.0 mph

County Perkins County, NE

The radar

The Goodland radar (KGLD), 165 km from the middle of the area, began a volume at 00:58 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
Aug 2, 7:04 PM MDT	HAIL 1.25	9 N Venango, NE
Aug 2, 7:45 PM MDT	HAIL 1	12 E 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, 0.9 hours before the alert went out and 114 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: 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.

294 
WUUS53 KLBF 030055
SVRLBF
NEC135-030200-
/O.NEW.KLBF.SV.W.0172.120803T0055Z-120803T0200Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
655 PM MDT THU AUG 2 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN PERKINS COUNTY IN SOUTHWEST NEBRASKA...

* UNTIL 800 PM MDT

* AT 650 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING GOLF BALL SIZE HAIL...AND
  DESTRUCTIVE WINDS IN EXCESS OF 70 MPH.  THIS STORM WAS LOCATED 8
  MILES NORTHWEST OF BRANDON...OR 13 MILES SOUTH OF BIG SPRINGS...AND
  MOVING SOUTHEAST AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  GRANT...BRANDON AND WILD HORSE SPRING.

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.

THIS STORM HAS EXHIBITED SOME WEAK ROTATION. TORNADOES CAN DEVELOP
QUICKLY FROM SEVERE THUNDERSTORMS. ALTHOUGH ONE IS 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.

&&

LAT...LON 4071 10193 4078 10206 4099 10206 4100 10205
      4100 10160 4070 10170
TIME...MOT...LOC 0055Z 302DEG 16KT 4087 10201
WIND...HAIL 70MPH 1.75IN

$$

SPRINGER

1 follow-up statement

485 
WWUS53 KLBF 030144
SVSLBF

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

NEC135-030154-
/O.CAN.KLBF.SV.W.0172.000000T0000Z-120803T0200Z/
PERKINS NE-
744 PM MDT THU AUG 2 2012

...THE SEVERE THUNDERSTORM WARNING FOR WESTERN PERKINS COUNTY IS
CANCELLED...

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

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR CHASE 
COUNTY AND SOUTHERN PERKINS COUNTY UNTIL 830 PM MDT.

LAT...LON 4071 10193 4078 10206 4099 10206 4100 10205
      4100 10160 4070 10170
TIME...MOT...LOC 0144Z 302DEG 16KT 4075 10177

$$

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 6:00 PM MDT	Tornado Warning	LBF	Deuel	30 min
Aug 2, 6:27 PM MDT	Severe Thunderstorm Warning	LBF	Deuel, Keith, Perkins	30 min
Aug 2, 6:40 PM MDT	Tornado Warning	LBF	Deuel, Perkins	25 min
Aug 2, 7:04 PM MDT	Tornado Warning	LBF	Perkins	26 min
Aug 2, 7:30 PM MDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	45 min
Aug 3, 12:19 AM MDT	Severe Thunderstorm Warning	LBF	Boyd, Brown, Holt, Keya Paha, Rock	56 min
Aug 3, 4:53 PM MDT	Severe Thunderstorm Warning	LBF	Boyd, Keya Paha	67 min
Aug 3, 5:40 PM MDT	Severe Thunderstorm Warning	LBF	Brown, Rock	65 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.