Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 54, NWS North Platte, NE

August 17, 2011Hooker County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 17, 2011, 6:44 PM MDT for Hooker County, Nebraska. It was in force for 46 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: Aug 17, 2011, 6:44 PM MDT (00:44 UTC)
Expired: Aug 17, 2011, 7:30 PM MDT
In force: 46 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Hooker County, NE

The radar

The North Platte radar (KLNX), 44 km from the middle of the area, began a volume at 00:43 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
Aug 17, 2:37 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 0.7 hours before the alert went out and 102 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: 1270 J/kg
Mixed-layer CIN: -74 J/kg
Mixed-layer LCL: 1399 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 180 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 7.5

Open this sounding in Storm Lab

The text

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

866 
WFUS53 KLBF 180044
TORLBF
NEC091-180130-
/O.NEW.KLBF.TO.W.0054.110818T0044Z-110818T0130Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
644 PM MDT WED AUG 17 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  HOOKER COUNTY IN WEST CENTRAL NEBRASKA...

* UNTIL 730 PM MDT

* AT 643 PM MDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED 10 MILES NORTHEAST OF CARR LAKE...OR 11 MILES
  WEST OF MULLEN...AND MOVING SOUTHEAST AT 15 MPH.

* LOCATIONS IMPACTED INCLUDE...
  MULLEN AND HIGHWAY 97 MILE MARKER 60.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW. MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A
STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME...A VEHICLE OR
OUTDOORS...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 4193 10085 4178 10137 4209 10143 4209 10104
TIME...MOT...LOC 0044Z 335DEG 14KT 4202 10125

$$

SPRINGER

1 follow-up statement

356 
WWUS53 KLBF 180129
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
729 PM MDT WED AUG 17 2011

NEC091-180138-
/O.EXP.KLBF.TO.W.0054.000000T0000Z-110818T0130Z/
HOOKER NE-
729 PM MDT WED AUG 17 2011

...THE TORNADO WARNING FOR HOOKER COUNTY WILL EXPIRE AT 730 PM MDT...

THE TORNADO THREAT HAS DIMINISHED...THEREFORE THE TORNADO WARNING HAS
EXPIRED. HOWEVER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT
FOR THE AREA.

ADDITIONAL STRONG THUNDERSTORMS ARE STILL POSSIBLE...AND A SEVERE 
THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 10 PM CDT (9 PM MDT).

REMEMBER...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT FOR 
SOUTHEAST HOOKER COUNTY AND FOR MCPHERSON COUNTY UNTIL 815 PM MDT 
(915 PM CDT).

LAT...LON 4193 10085 4178 10137 4209 10143 4209 10104
TIME...MOT...LOC 0128Z 335DEG 14KT 4186 10115

$$

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 6:07 PM MDT	Tornado Warning	LBF	Cherry, Hooker	38 min
Aug 17, 6:36 PM MDT	Severe Thunderstorm Warning	LBF	Chase	39 min
Aug 17, 7:13 PM MDT	Severe Thunderstorm Warning	LBF	Hooker, McPherson	62 min
Aug 17, 8:10 PM MDT	Tornado Warning	LBF	Brown, Cherry, Keya Paha	35 min
Aug 17, 8:44 PM MDT	Tornado Warning	LBF	Brown, Keya Paha, Rock	31 min
Aug 17, 9:09 PM MDT	Severe Thunderstorm Warning	LBF	Boyd, Brown, Holt, Keya Paha, Rock	51 min
Aug 18, 3:22 PM MDT	Severe Thunderstorm Warning	LBF	Boyd	53 min
Aug 18, 3:43 PM MDT	Severe Thunderstorm Warning	LBF	Holt	47 min
Aug 18, 3:54 PM MDT	Severe Thunderstorm Warning	LBF	Boyd, Holt	66 min
Aug 18, 4:19 PM MDT	Tornado Warning	LBF	Holt	26 min
Aug 18, 4:25 PM MDT	Severe Thunderstorm Warning	LBF	Holt	50 min
Aug 18, 4:53 PM MDT	Tornado Warning	LBF	Holt	37 min
Aug 18, 5:39 PM MDT	Severe Thunderstorm Warning	LBF	Cherry	66 min

Nearby

Tornado Warnings in Nebraska, 2011 Every tornado warning in 2011 Tornadoes 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.