Alert archive / Texas / Tornado Warnings in 2011

Tornado Warning 21, NWS Shreveport, LA

April 25, 20116 counties in Texas

NWS Shreveport, LA issued this tornado warning at Apr 25, 2011, 3:14 PM CDT for 6 counties in Texas. 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: Apr 25, 2011, 3:14 PM CDT (20:14 UTC)
Expired: Apr 25, 2011, 4:00 PM CDT
In force: 46 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Camp County, TX, Cass County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Upshur County, TX

The radar

The Shreveport radar (KSHV), 108 km from the middle of the area, began a volume at 20:17 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 25, 11:00 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.2 hours before the alert went out and 114 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: 1213 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 759 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 231 m²/s²
0-3 km storm-relative helicity: 491 m²/s²
Significant tornado parameter: 2.2
Supercell composite: 11.5

Open this sounding in Storm Lab

The text

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

771 
WFUS54 KSHV 252014
TORSHV
TXC063-067-203-315-343-459-252100-
/O.NEW.KSHV.TO.W.0021.110425T2014Z-110425T2100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
314 PM CDT MON APR 25 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN CAMP COUNTY IN NORTHEAST TEXAS...
  SOUTHWESTERN CASS COUNTY IN NORTHEAST TEXAS...
  EXTREME NORTHWESTERN HARRISON COUNTY IN NORTHEAST TEXAS...
  NORTHWESTERN MARION COUNTY IN NORTHEAST TEXAS...
  SOUTHERN MORRIS COUNTY IN NORTHEAST TEXAS...
  NORTHERN UPSHUR COUNTY IN NORTHEAST TEXAS...
  THIS INCLUDES THE CITY OF GILMER...

* UNTIL 400 PM CDT

* AT 312 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR ROSEWOOD...
  OR 8 MILES WEST OF GILMER...MOVING NORTHEAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO ORE
  CITY...CEDAR SPRINGS...LONE STAR...DAINGERFIELD...JENKINS...ROCKY
  BRANCH AND HUGHES SPRINGS...

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 3301 9486 3299 9482 3306 9482 3319 9469
      3277 9448 3265 9512 3272 9515
TIME...MOT...LOC 2014Z 245DEG 40KT 3272 9506

$$

ELEVEN

2 follow-up statements

788 
WWUS54 KSHV 252039
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
339 PM CDT MON APR 25 2011

TXC203-252049-
/O.CAN.KSHV.TO.W.0021.000000T0000Z-110425T2100Z/
HARRISON TX-
339 PM CDT MON APR 25 2011

...THE TORNADO WARNING FOR HARRISON COUNTY IS CANCELLED...

LAT...LON 3301 9486 3299 9482 3306 9482 3319 9469
      3277 9448 3280 9481 3285 9490
TIME...MOT...LOC 2039Z 245DEG 40KT 3286 9481

$$

TXC063-067-315-343-459-252100-
/O.CON.KSHV.TO.W.0021.000000T0000Z-110425T2100Z/
MORRIS TX-CASS TX-CAMP TX-UPSHUR TX-MARION TX-
339 PM CDT MON APR 25 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 400 PM CDT FOR MARION...
UPSHUR...CAMP...CASS AND MORRIS COUNTIES...

AT 338 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR LAFAYETTE...OR 11 MILES NORTHEAST OF GILMER...MOVING
NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO HOLLY
SPRINGS...CENTER POINT...ORE CITY...CEDAR SPRINGS...LONE STAR...
DAINGERFIELD...JENKINS...ROCKY BRANCH...HUGHES SPRINGS AND AVINGER

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 3301 9486 3299 9482 3306 9482 3319 9469
      3277 9448 3280 9481 3285 9490
TIME...MOT...LOC 2039Z 245DEG 40KT 3286 9481

$$

ELEVEN

995 
WWUS54 KSHV 252055
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
355 PM CDT MON APR 25 2011

TXC063-067-315-343-459-252105-
/O.EXP.KSHV.TO.W.0021.000000T0000Z-110425T2100Z/
MORRIS TX-CASS TX-CAMP TX-UPSHUR TX-MARION TX-
355 PM CDT MON APR 25 2011

...THE TORNADO WARNING FOR MARION...UPSHUR...CAMP...CASS AND MORRIS
COUNTIES WILL EXPIRE AT 400 PM CDT...

LAT...LON 3301 9486 3299 9482 3306 9482 3319 9469
      3277 9448 3280 9481 3285 9490
TIME...MOT...LOC 2055Z 245DEG 40KT 3293 9462

$$

ELEVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 24, 7:33 PM CDT	Lake Wind Advisory	SHV	Angelina, Camp, Cass, Cherokee, Franklin, Gregg and 13 more	87 min
Apr 24, 9:35 PM CDT	Severe Thunderstorm Warning	SHV	Red River	55 min
Apr 25, 12:09 AM CDT	Severe Thunderstorm Warning	SHV	Franklin, Red River, Titus	66 min
Apr 25, 12:41 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River, Titus	64 min
Apr 25, 3:48 AM CDT	Lake Wind Advisory	SHV	Angelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more	21 hr
Apr 25, 5:19 AM CDT	Severe Thunderstorm Warning	SHV	Red River	56 min
Apr 25, 6:14 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	61 min
Apr 25, 12:11 PM CDT	Severe Thunderstorm Warning	SHV	Red River	49 min
Apr 25, 12:29 PM CDT	Flash Flood Warning	SHV	Red River	4 hr
Apr 25, 1:37 PM CDT	Severe Thunderstorm Warning	SHV	Red River	38 min
Apr 25, 1:48 PM CDT	Tornado Warning	SHV	Red River	27 min
Apr 25, 2:36 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Smith, Upshur, Wood	54 min
Apr 25, 2:37 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	38 min
Apr 25, 2:55 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Smith	50 min
Apr 25, 3:14 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	46 min
Apr 25, 3:30 PM CDT	Tornado Warning	SHV	Cherokee, Gregg, Rusk, Smith	45 min
Apr 25, 3:49 PM CDT	Flash Flood Watch	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 1 more	39 hr
Apr 25, 4:11 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola, Rusk	19 min
Apr 25, 4:39 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Red River, Titus	51 min
Apr 25, 5:14 PM CDT	Tornado Warning	SHV	Bowie, Red River, Titus	31 min
Apr 25, 5:30 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass, Morris, Red River, Titus	45 min
Apr 25, 6:02 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	43 min
Apr 25, 6:15 PM CDT	Tornado Warning	SHV	Bowie	45 min
Apr 25, 6:24 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Red River, Titus	36 min
Apr 25, 6:54 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	51 min
Apr 25, 6:57 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Franklin, Marion, Morris and 3 more	48 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.