Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 55, NWS North Platte, NE

August 17, 2011Brown County, Cherry County, Keya Paha County, Nebraska

NWS North Platte, NE issued this tornado warning at Aug 17, 2011, 9:10 PM CDT for Brown County, Cherry County, Keya Paha County, Nebraska. It was in force for 35 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 17, 2011, 9:10 PM CDT (02:10 UTC)
Expired: Aug 17, 2011, 9:45 PM CDT
In force: 35 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

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

The radar

The North Platte radar (KLNX), 110 km from the middle of the area, began a volume at 02:10 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 17, 9:37 PM CDT	FUNNEL CLOUD	12 W Springview, NE
Aug 17, 9:47 PM CDT	FUNNEL CLOUD	17 Nnw Ainsworth, NE

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 17, 3:37 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 2.2 hours before the alert went out and 194 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.

812 
WFUS53 KLBF 180210
TORLBF
NEC017-031-103-180245-
/O.NEW.KLBF.TO.W.0055.110818T0210Z-110818T0245Z/

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

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  NORTHERN BROWN COUNTY IN NORTH CENTRAL NEBRASKA...
  NORTHEASTERN CHERRY COUNTY IN NORTH CENTRAL NEBRASKA...
  WESTERN KEYA PAHA COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 945 PM CDT

* AT 906 PM CDT...THE PUBLIC REPORTED A TORNADO 6 MILES NORTHEAST OF
  SPARKS...OR 20 MILES NORTHEAST OF VALENTINE. DOPPLER RADAR SHOWED
  THIS TORNADO MOVING SOUTHEAST AT 35 MPH.

* THE TORNADO WILL BE NEAR...
  NORTH RIVER TRAIL AROUND 935 PM CDT.

OTHER LOCATIONS IMPACTED BY THE TORNADO INCLUDE HIGHWAY 12 MILE
MARKER 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4272 9960 4274 9967 4269 9968 4266 10028
      4300 10033 4301 9989
TIME...MOT...LOC 0210Z 336DEG 30KT 4298 10018

$$

TAYLOR

2 follow-up statements

305 
WWUS53 KLBF 180221
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
921 PM CDT WED AUG 17 2011

NEC017-031-103-180245-
/O.CON.KLBF.TO.W.0055.000000T0000Z-110818T0245Z/
BROWN NE-KEYA PAHA NE-CHERRY NE-
921 PM CDT WED AUG 17 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN CHERRY...
WESTERN KEYA PAHA AND NORTHERN BROWN COUNTIES UNTIL 945 PM CDT...

AT 916 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 6 MILES EAST OF SPARKS...OR 20 MILES EAST OF
VALENTINE...MOVING SOUTHEAST AT 30 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  NORTH RIVER TRAIL AROUND 940 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE HIGHWAY 12
MILE MARKER 30.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4272 9960 4274 9967 4269 9968 4266 10028
      4300 10033 4301 9989
TIME...MOT...LOC 0221Z 337DEG 28KT 4292 10014

$$

TAYLOR

395 
WWUS53 KLBF 180233
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
933 PM CDT WED AUG 17 2011

NEC017-031-103-180245-
/O.CON.KLBF.TO.W.0055.000000T0000Z-110818T0245Z/
BROWN NE-KEYA PAHA NE-CHERRY NE-
933 PM CDT WED AUG 17 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR NORTHEASTERN CHERRY...
WESTERN KEYA PAHA AND NORTHERN BROWN COUNTIES UNTIL 945 PM CDT...

AT 930 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED 5 MILES NORTH OF NORTH RIVER TRAIL...OR 16 MILES
WEST OF SPRINGVIEW...MOVING SOUTHEAST AT 30 MPH.

THIS DANGEROUS STORM WILL BE NEAR...
  NORTH RIVER TRAIL AROUND 940 PM CDT.
  BOBCAT STATE WILDLIFE MANAGEMENT AREA AROUND 945 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS DANGEROUS STORM INCLUDE HIGHWAY 12
MILE MARKER 40.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TORNADOES ARE DIFFICULT TO SEE AND CONFIRM AT NIGHT. TAKE COVER NOW.

&&

LAT...LON 4272 9960 4274 9967 4269 9968 4266 10028
      4300 10033 4301 9989
TIME...MOT...LOC 0233Z 321DEG 28KT 4285 10003

$$

TAYLOR

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 17, 7:07 PM CDT	Tornado Warning	LBF	Cherry, Hooker	38 min
Aug 17, 7:36 PM CDT	Severe Thunderstorm Warning	LBF	Chase	39 min
Aug 17, 7:44 PM CDT	Tornado Warning	LBF	Hooker	46 min
Aug 17, 8:13 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, McPherson	62 min
Aug 17, 9:44 PM CDT	Tornado Warning	LBF	Brown, Keya Paha, Rock	31 min
Aug 17, 10:09 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Brown, Holt, Keya Paha, Rock	51 min
Aug 18, 4:22 PM CDT	Severe Thunderstorm Warning	LBF	Boyd	53 min
Aug 18, 4:43 PM CDT	Severe Thunderstorm Warning	LBF	Holt	47 min
Aug 18, 4:54 PM CDT	Severe Thunderstorm Warning	LBF	Boyd, Holt	66 min
Aug 18, 5:19 PM CDT	Tornado Warning	LBF	Holt	26 min
Aug 18, 5:25 PM CDT	Severe Thunderstorm Warning	LBF	Holt	50 min
Aug 18, 5:53 PM CDT	Tornado Warning	LBF	Holt	37 min
Aug 18, 6:39 PM CDT	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.