Alert archive / Nebraska / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 33, NWS North Platte, NE

May 30, 2011Custer County, Nebraska

NWS North Platte, NE issued this severe thunderstorm warning at May 30, 2011, 7:39 PM CDT for Custer County, Nebraska. It was in force for 51 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: May 30, 2011, 7:39 PM CDT (00:39 UTC)
Expired: May 30, 2011, 8:30 PM CDT
In force: 51 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Custer County, NE

The radar

The North Platte radar (KLNX), 115 km from the middle of the area, began a volume at 00:39 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 watch it was issued in

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

Issued	Product	Office	Lasted
May 30, 2:08 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 76 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: 634 J/kg
Mixed-layer CIN: -231 J/kg
Mixed-layer LCL: 2144 m above ground
0-6 km bulk shear: 79 kt
0-1 km storm-relative helicity: 18 m²/s²
0-3 km storm-relative helicity: 144 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -1.1

Open this sounding in Storm Lab

The text

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

023 
WUUS53 KLBF 310039
SVRLBF
NEC041-310130-
/O.NEW.KLBF.SV.W.0033.110531T0039Z-110531T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
739 PM CDT MON MAY 30 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN CUSTER COUNTY IN CENTRAL NEBRASKA...

* UNTIL 830 PM CDT

* AT 739 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  OCONTO...OR 19 MILES SOUTH OF BROKEN BOW...AND MOVING NORTHEAST AT
  45 MPH.

* THE SEVERE THUNDERSTORM WILL BE NEAR...
  PRESSEY STATE WILDLIFE MANAGEMENT AREA AROUND 745 PM CDT.
  BERWYN AND BROKEN BOW AROUND 805 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WATCH REMAINS IN EFFECT FOR 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.

&&

LAT...LON 4105 9989 4145 9965 4137 9925 4104 9961
      4104 9985
TIME...MOT...LOC 0040Z 212DEG 37KT 4115 9972
WIND...HAIL 60MPH 1.00IN

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
May 30, 7:00 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
May 30, 7:13 PM CDT	Tornado Warning	LBF	Boyd	17 min
May 30, 7:18 PM CDT	Severe Thunderstorm Warning	LBF	Custer, Loup	42 min
May 30, 7:45 PM CDT	Severe Thunderstorm Warning	LBF	Custer	45 min
May 30, 7:52 PM CDT	Severe Thunderstorm Warning	LBF	Garfield, Wheeler	23 min
May 30, 7:55 PM CDT	Severe Thunderstorm Warning	LBF	Custer	50 min
May 30, 8:03 PM CDT	Severe Thunderstorm Warning	LBF	Custer	42 min
May 30, 8:14 PM CDT	Tornado Warning	LBF	Custer	31 min

Nearby

Severe Thunderstorm Warnings in Nebraska, 2011 Every severe thunderstorm warning in 2011

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.