Alert archive / Nebraska / Tornado Warnings in 2011

Tornado Warning 38, NWS North Platte, NE

July 12, 2011Thomas County, Nebraska

NWS North Platte, NE issued this tornado warning at Jul 12, 2011, 12:18 AM CDT for Thomas County, Nebraska. It was in force for 27 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: Jul 12, 2011, 12:18 AM CDT (05:18 UTC)
Expired: Jul 12, 2011, 12:45 AM CDT
In force: 27 min
Issued by: NWS North Platte, NE
Area: Storm-based polygon

County Thomas County, NE

The radar

The North Platte radar (KLNX), 18 km from the middle of the area, began a volume at 05:18 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 nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 00:00Z, 5.3 hours before the alert went out and 81 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: 2166 J/kg
Mixed-layer CIN: -103 J/kg
Mixed-layer LCL: 1348 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 74 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.2

Open this sounding in Storm Lab

The text

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

664 
WFUS53 KLBF 120518
TORLBF
NEC171-120545-
/O.NEW.KLBF.TO.W.0038.110712T0518Z-110712T0545Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1218 AM CDT TUE JUL 12 2011

THE NATIONAL WEATHER SERVICE IN NORTH PLATTE HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN THOMAS COUNTY IN NORTH CENTRAL NEBRASKA...

* UNTIL 1245 AM CDT

* AT 1213 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO. THIS DANGEROUS
  STORM WAS LOCATED NEAR HIGHWAY 83 CROSSING THE DISMAL RIVER...OR 10
  MILES SOUTH OF THEDFORD...AND MOVING NORTHEAST AT 25 MPH.

* LOCATIONS IMPACTED INCLUDE...
  HIGHWAY 2 MILE MARKER 220.

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 4175 10026 4174 10060 4189 10072 4209 10027
TIME...MOT...LOC 0518Z 235DEG 21KT 4185 10054

$$

SPRINGER

2 follow-up statements

631 
WWUS53 KLBF 120530
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1230 AM CDT TUE JUL 12 2011

NEC171-120545-
/O.CON.KLBF.TO.W.0038.000000T0000Z-110712T0545Z/
THOMAS NE-
1230 AM CDT TUE JUL 12 2011

...A TORNADO WARNING REMAINS IN EFFECT FOR SOUTHEASTERN THOMAS COUNTY
UNTIL 1245 AM CDT...

AT 1227 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO.  THIS DANGEROUS
STORM WAS LOCATED NEAR THEDFORD...MOVING NORTHEAST AT 35 MPH.

LOCATIONS IMPACTED INCLUDE...
  HIGHWAY 2 MILE MARKER 220.

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.

THIS LINE OF THUNDERSTORMS IS CAPABLE OF PRODUCING TORNADOES AND
WIDESPREAD SIGNIFICANT WIND DAMAGE. DO NOT WAIT TO SEE OR HEAR THE
TORNADO. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST
FLOOR OF YOUR HOME OR BUSINESS.

&&

LAT...LON 4175 10026 4174 10060 4189 10072 4209 10027
TIME...MOT...LOC 0530Z 218DEG 32KT 4196 10049

$$

SPRINGER

640 
WWUS53 KLBF 120544
SVSLBF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORTH PLATTE NE
1244 AM CDT TUE JUL 12 2011

NEC171-120554-
/O.EXP.KLBF.TO.W.0038.000000T0000Z-110712T0545Z/
THOMAS NE-
1244 AM CDT TUE JUL 12 2011

...THE TORNADO WARNING FOR SOUTHEASTERN THOMAS COUNTY WILL EXPIRE AT
1245 AM CDT/1145 PM MDT/...

THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED AND MOVED OUT OF
THE WARNED AREA.  HOWEVER HEAVY RAIN IS STILL POSSIBLE WITH THIS
THUNDERSTORM.

LAT...LON 4175 10026 4174 10060 4189 10072 4209 10027
TIME...MOT...LOC 0544Z 218DEG 32KT 4205 10038

$$

SPRINGER

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 11, 7:14 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Sheridan	61 min
Jul 11, 7:19 PM CDT	Tornado Warning	LBF	Cherry	41 min
Jul 11, 8:02 PM CDT	Tornado Warning	LBF	Cherry	41 min
Jul 11, 8:12 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	63 min
Jul 11, 8:17 PM CDT	Tornado Warning	LBF	Cherry	28 min
Jul 11, 8:23 PM CDT	Severe Thunderstorm Warning	LBF	Deuel	67 min
Jul 11, 8:55 PM CDT	Severe Thunderstorm Warning	LBF	Cherry	50 min
Jul 11, 9:40 PM CDT	Severe Thunderstorm Warning	LBF	Cherry, Hooker, Thomas	65 min
Jul 11, 11:37 PM CDT	Severe Thunderstorm Warning	LBF	Hooker, Logan, McPherson, Thomas	53 min
Jul 12, 4:00 PM CDT	Flash Flood Watch	LBF	Chase, Deuel, Hayes, Keith, Lincoln, Perkins	15 hr

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.