Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 13, NWS Shreveport, LA

April 19, 2011Red River County, Texas

NWS Shreveport, LA issued this tornado warning at Apr 19, 2011, 7:26 PM CDT for Red River County, Texas. It was in force for 49 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: Apr 19, 2011, 7:26 PM CDT (00:26 UTC)
Expired: Apr 19, 2011, 8:15 PM CDT
In force: 49 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Red River County, TX

The radar

The Shreveport radar (KSHV), 177 km from the middle of the area, began a volume at 00:28 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
Apr 19, 2:16 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.4 hours before the alert went out and 180 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: 2277 J/kg
Mixed-layer CIN: -179 J/kg
Mixed-layer LCL: 1895 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 127 m²/s²
0-3 km storm-relative helicity: 165 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.6

Open this sounding in Storm Lab

The text

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

665 
WFUS54 KSHV 200026
TORSHV
TXC387-200115-
/O.NEW.KSHV.TO.W.0013.110420T0026Z-110420T0115Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
726 PM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL RED RIVER COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITY OF CLARKSVILLE...

* UNTIL 815 PM CDT

* AT 725 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 6 MILES WEST OF
  BAGWELL...OR NEAR DETROIT...MOVING EAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  NEGLEY...BRYARLY AND ENGLISH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 3382 9491 3380 9491 3379 9491 3375 9486
      3375 9481 3374 9481 3360 9480 3360 9531
      3378 9531
TIME...MOT...LOC 0025Z 265DEG 29KT 3370 9526

$$

13

2 follow-up statements

617 
WWUS54 KSHV 200041
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
741 PM CDT TUE APR 19 2011

TXC387-200115-
/O.CON.KSHV.TO.W.0013.000000T0000Z-110420T0115Z/
RED RIVER TX-
741 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR RED RIVER
COUNTY...

AT 739 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
SHOW A VERY STRONG SIGNATURE OF A TORNADO NEAR NEGLEY OR 8 MILES
NORTHWEST OF CLARKSVILLE...MOVING EAST AT 35 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO BRYARLY
AND ENGLISH

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 3382 9493 3381 9491 3379 9491 3375 9486
      3375 9481 3360 9480 3364 9520 3377 9520
TIME...MOT...LOC 0039Z 265DEG 29KT 3371 9509

$$

13

653 
WWUS54 KSHV 200101
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
801 PM CDT TUE APR 19 2011

TXC387-200115-
/O.CON.KSHV.TO.W.0013.000000T0000Z-110420T0115Z/
RED RIVER TX-
801 PM CDT TUE APR 19 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 815 PM CDT FOR RED RIVER
COUNTY...

AT 801 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR BRYARLY...OR 11 MILES NORTHEAST OF CLARKSVILLE...MOVING
EAST AT 35 MPH.

THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
INDICATED COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A TORNADO WARNING MEANS THAT STRONG ROTATION HAS BEEN DETECTED IN THE
STORM. A TORNADO MAY ALREADY BE ON THE GROUND...OR IS EXPECTED TO
DEVELOP SHORTLY. IF YOU ARE IN THE PATH OF THIS DANGEROUS STORM...
MOVE INDOORS AND TO THE LOWEST LEVEL OF THE BUILDING. STAY AWAY FROM
WINDOWS. IF DRIVING...DO NOT SEEK SHELTER UNDER A HIGHWAY OVERPASS.

&&

LAT...LON 3382 9493 3381 9491 3379 9491 3375 9486
      3375 9481 3360 9480 3362 9499 3377 9500
TIME...MOT...LOC 0101Z 265DEG 29KT 3372 9488

$$

13

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 7:17 PM CDT	Severe Thunderstorm Warning	SHV	Red River	43 min
Apr 19, 8:04 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	41 min
Apr 19, 8:25 PM CDT	Tornado Warning	SHV	Bowie	50 min
Apr 19, 9:55 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	50 min
Apr 19, 10:36 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	54 min
Apr 19, 11:10 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	65 min
Apr 20, 12:09 AM CDT	Severe Thunderstorm Warning	SHV	Bowie	33 min

Nearby

Tornado Warnings in Texas, 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.