Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 175, NWS North Platte, NE

August 3, 2012Boyd County, Keya Paha County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 3, 2012, 5:53 PM CDT for Boyd County, Keya Paha County, Nebraska. It was in force for 67 min. 3 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 3, 2012, 5:53 PM CDT (22:53 UTC)
Expired: Aug 3, 2012, 7:00 PM CDT
In force: 67 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Boyd County, NE, Keya Paha County, NE

The radar

The North Platte radar (KLNX), 151 km from the middle of the area, began a volume at 22:55 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 3, 6:00 PM CDT	HAIL 0.88	5 Sw Mills, NE
Aug 3, 6:10 PM CDT	HAIL 0.88	Mills, NE
Aug 3, 6:30 PM CDT	HAIL 1	7 S Mills, NE	HAILED STORM LASTED FOR ABOUT 25 MINUTES WITH THE LARGEST QUARTER SIZE. HAIL MADE THE GROUND MOSTLY WHITE.

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 12:00Z, 10.9 hours before the alert went out and 224 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: 783 J/kg
Mixed-layer CIN: -289 J/kg
Mixed-layer LCL: 1209 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: 54 m²/s²
0-3 km storm-relative helicity: -10 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.

364 
WUUS53 KLBF 032253
SVRLBF
NEC015-103-040000-
/O.NEW.KLBF.SV.W.0175.120803T2253Z-120804T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
553 PM CDT FRI AUG 3 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  WESTERN BOYD COUNTY IN NORTH CENTRAL NEBRASKA...
  EASTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 700 PM CDT

* AT 551 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING PING PONG BALL
  SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS
  WERE LOCATED ALONG A LINE EXTENDING FROM 9 MILES NORTH OF MILLS TO
  6 MILES SOUTH OF BURTON...AND MOVING EAST AT 30 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  MILLS AROUND 600 PM CDT.
  NAPER AROUND 625 PM CDT.
  HULL LAKE STATE WILDLIFE MANAGEMENT AREA...BUTTE AND ANOKA AROUND
  655 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
HIGHWAY 137 MILE MARKER 20 AND HIGHWAY 12 MILE MARKER 90.

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.

&&

LAT...LON 4284 9889 4290 9896 4290 9899 4286 9906
      4284 9916 4280 9927 4277 9942 4272 9954
      4274 9974 4301 9957 4300 9877
TIME...MOT...LOC 2253Z 273DEG 26KT 4307 9934 4282 9956
WIND...HAIL 60MPH 1.50IN

$$

ROBERG

2 follow-up statements

041 
WWUS53 KLBF 032320
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
620 PM CDT FRI AUG 3 2012

NEC015-103-040000-
/O.CON.KLBF.SV.W.0175.000000T0000Z-120804T0000Z/
BOYD NE-KEYA PAHA NE-
620 PM CDT FRI AUG 3 2012

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR EASTERN KEYA
PAHA AND WESTERN BOYD COUNTIES UNTIL 700 PM CDT...

AT 618 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
LINE OF SEVERE THUNDERSTORMS CAPABLE OF PRODUCING QUARTER SIZE
HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH.  THESE STORMS WERE
LOCATED ALONG A LINE EXTENDING FROM NAPER TO THOMAS CREEK STATE
WILDLIFE MANAGEMENT AREA...MOVING EAST AT 25 MPH.

SEVERE THUNDERSTORMS WILL BE NEAR...
  ANOKA...BUTTE AND HULL LAKE STATE WILDLIFE MANAGEMENT AREA AROUND
  700 PM CDT.

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.

&&

LAT...LON 4284 9889 4290 9896 4290 9899 4286 9906
      4284 9916 4280 9927 4277 9942 4272 9954
      4274 9974 4301 9957 4300 9877
TIME...MOT...LOC 2321Z 269DEG 23KT 4298 9911 4277 9956
WIND...HAIL 60MPH 1.00IN

$$

ROBERG

745 
WWUS53 KLBF 040001
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
701 PM CDT FRI AUG 3 2012

NEC015-103-040011-
/O.EXP.KLBF.SV.W.0175.000000T0000Z-120804T0000Z/
BOYD NE-KEYA PAHA NE-
701 PM CDT FRI AUG 3 2012

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN KEYA PAHA AND WESTERN
BOYD COUNTIES HAS EXPIRED...

THE LINE OF STORMS WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED
OUT OF THE WARNED AREA.  HOWEVER GUSTY WINDS AND HEAVY RAIN ARE STILL
POSSIBLE WITH THESE THUNDERSTORMS AS THEY EXIT SOUTHEASTERN KEYA 
PAHA COUNTY.

LAT...LON 4284 9889 4290 9896 4290 9899 4286 9906
      4284 9916 4280 9927 4277 9942 4272 9954
      4274 9974 4301 9957 4300 9877
TIME...MOT...LOC 2320Z 269DEG 23KT 4298 9912 4277 9957

$$

ROBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 2, 7:00 PM CDT	Tornado Warning	LBF	Deuel	30 min
Aug 2, 7:27 PM CDT	Severe Thunderstorm Warning	LBF	Deuel, Keith, Perkins	30 min
Aug 2, 7:40 PM CDT	Tornado Warning	LBF	Deuel, Perkins	25 min
Aug 2, 7:55 PM CDT	Severe Thunderstorm Warning	LBF	Perkins	49 min
Aug 2, 8:04 PM CDT	Tornado Warning	LBF	Perkins	26 min
Aug 2, 8:30 PM CDT	Severe Thunderstorm Warning	LBF	Chase, Perkins	45 min
Aug 3, 1:19 AM CDT	Severe Thunderstorm Warning	LBF	Boyd, Brown, Holt, Keya Paha, Rock	56 min
Aug 3, 6:40 PM CDT	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.