Alert archive / Nebraska / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 162, NWS North Platte, NE

August 1, 20124 counties in Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at Aug 1, 2012, 6:44 PM CDT for 4 counties in Nebraska. It was in force for 46 min. 4 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 1, 2012, 6:44 PM CDT (23:44 UTC)
Expired: Aug 1, 2012, 7:30 PM CDT
In force: 46 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

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

The radar

The North Platte radar (KLNX), 102 km from the middle of the area, began a volume at 23:47 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 1, 6:55 PM CDT	TSTM WND GST 56	7 W Ainsworth, NE
Aug 1, 7:02 PM CDT	TSTM WND GST 58	7 W Ainsworth, NE
Aug 1, 7:15 PM CDT	TSTM WND GST 60	9 W Rose, NE	THUNDERSTORM WIND GUST ESTIMATED AS HIGH AS 60 MPH FROM 715 PM CDT THROUGH 720 PM CDT. LIGHTNING CAUSED HAY FIRES IN FIELDS NEARBY AROUND 730 PM CDT. DELAYED REPORTS FROM THE EVENING OF AUGUST 1ST.
Aug 1, 7:20 PM CDT	TSTM WND GST 70	14 W Rose, NE	BRANCHES DOWN. POWER OUT AT LOCATION.

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
Aug 1, 3:19 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.7 hours before the alert went out and 182 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: 756 J/kg
Mixed-layer CIN: -301 J/kg
Mixed-layer LCL: 1649 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 212 m²/s²
0-3 km storm-relative helicity: 240 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

921 
WUUS53 KLBF 012344
SVRLBF
NEC017-031-103-149-020030-
/O.NEW.KLBF.SV.W.0162.120801T2344Z-120802T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
644 PM CDT WED AUG 1 2012

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  BROWN COUNTY IN NORTH CENTRAL NEBRASKA...
  SOUTHEASTERN CHERRY COUNTY IN NORTH CENTRAL NEBRASKA...
  CENTRAL KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...
  WESTERN ROCK COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 730 PM CDT

* AT 642 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 11 MILES NORTH OF NORTH RIVER TRAIL TO JOHNSTOWN TO 6 MILES
  WEST OF PURDUM...AND MOVING EAST AT 35 MPH.

* SEVERE THUNDERSTORMS WILL BE NEAR...
  LONG LAKE STATE WILDLIFE MANAGEMENT AREA AROUND 650 PM CDT.
  BOBCAT STATE WILDLIFE MANAGEMENT AREA...WILLOW LAKE STATE WILDLIFE
  MANAGEMENT AREA...ELSMERE AND AINSWORTH AROUND 655 PM CDT.
  KELLER PARK STATE RECREATION AREA AND SPRINGVIEW AROUND 705 PM CDT.
  THOMAS CREEK STATE WILDLIFE MANAGEMENT AREA AND LONG PINE AROUND
  710 PM CDT.
  BURTON AROUND 715 PM CDT.
  BASSETT AROUND 725 PM CDT.
  TWIN LAKES STATE WILDLIFE MANAGEMENT AREA AROUND 730 PM CDT.

OTHER LOCATIONS IMPACTED BY THESE SEVERE THUNDERSTORMS INCLUDE
HIGHWAY 12 MILE MARKER 40...HIGHWAY 7 MILE MARKER 40...HIGHWAY 183
MILE MARKER 220...HIGHWAY 7 MILE MARKER 30 AND HIGHWAY 183 MILE
MARKER 170.

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.

THESE STORMS HAVE A HISTORY OF PRODUCING WIDESPREAD WIND DAMAGE. 
SEEK SHELTER NOW INSIDE A STURDY STRUCTURE AND STAY AWAY FROM 
WINDOWS.

&&

LAT...LON 4299 9945 4210 9944 4209 10038 4298 9991
TIME...MOT...LOC 2344Z 287DEG 30KT 4294 9995 4251 10000
          4209 10035
WIND...HAIL 60MPH <.75IN

$$

ROBERG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 3:19 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	56 min
Aug 1, 3:23 PM CDT	Severe Thunderstorm Warning	LBF	Garden	52 min
Aug 1, 4:15 PM CDT	Severe Thunderstorm Warning	LBF	Sheridan	44 min
Aug 1, 5:03 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Grant	42 min
Aug 1, 6:00 PM CDT	Severe Thunderstorm Warning	LBF	Brown, Cherry, Keya Paha	60 min
Aug 1, 6:10 PM CDT	Severe Thunderstorm Warning	LBF	Arthur, Keith, Lincoln, McPherson	50 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.