Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 42, NWS Shreveport, LA

April 26, 2011Bossier Parish, Caddo Parish, Louisiana; Harrison County, Marion County, Texas

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 7:10 PM CDT for Bossier Parish, Caddo Parish, Louisiana; Harrison County, Marion County, Texas. It was in force for 50 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: Apr 26, 2011, 7:10 PM CDT (00:10 UTC)
Expired: Apr 26, 2011, 8:00 PM CDT
In force: 50 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bossier Parish, LA, Caddo Parish, LA, Harrison County, TX, Marion County, TX

The radar

The Shreveport radar (KSHV), 29 km from the middle of the area, began a volume at 00:13 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
Apr 26, 7:24 PM CDT	TORNADO	5 Wnw Waskom, TX	AN EF0 TORNADO TOUCHED DOWN SNAPPING A FEW TREES JUST NORTH OF I-20 NEAR THE HWY 80 EXIT W OF WASKOM. THE TORNADO CONTINUED NE CAUSING SPORADIC TREE DAMAGE ALONG BELLVIEW RD AND ALSO TOPPLED SEVERAL LARGE TREES ALONG CONCORD RD BETWEEN FM 134 AND OWEN GEORGE R
Apr 26, 7:34 PM CDT	TORNADO	4 S Benton, LA	AN EF0 TORNADO TOUCHED DOWN AND SNAPPED SEVERAL TREES IN THE MAGNOLIA CHASE SUBDIVISION JUST OFF OF BENTON RD. THE TORNADO CONTINUED TO THE NNE WHERE IT BROKE OFF LARGE LIMBS ON A FEW TREES ALONG BENTON RD NEAR JACOBS TRAIL. THE TORNADO CONTINUED TO THE NE WHE

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
Apr 26, 1:44 PM CDT	Tornado Watch PDS	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 0.2 hours before the alert went out and 34 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: 2270 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 961 m above ground
0-6 km bulk shear: 55 kt
0-1 km storm-relative helicity: 281 m²/s²
0-3 km storm-relative helicity: 428 m²/s²
Significant tornado parameter: 5.6
Supercell composite: 23.5

Open this sounding in Storm Lab

The text

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

623 
WFUS54 KSHV 270010
TORSHV
LAC015-017-TXC203-315-270100-
/O.NEW.KSHV.TO.W.0042.110427T0010Z-110427T0100Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
710 PM CDT TUE APR 26 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EASTERN HARRISON COUNTY IN NORTHEAST TEXAS...
  SOUTHEASTERN MARION COUNTY IN NORTHEAST TEXAS...
  WEST CENTRAL BOSSIER PARISH IN NORTHWEST LOUISIANA...
  NORTHERN CADDO PARISH IN NORTHWEST LOUISIANA...

* UNTIL 800 PM CDT

* AT 708 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 12 MILES WEST OF
  WASKOM...OR 8 MILES SOUTHEAST OF MARSHALL...MOVING NORTHEAST AT 40
  MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KARNACK...MOORINGSPORT...BLANCHARD...OIL CITY...BELCHER...HOSSTON
  AND GILLIAM...

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 3283 9397 3300 9382 3257 9373 3234 9427
      3234 9431 3248 9443
TIME...MOT...LOC 0010Z 243DEG 37KT 3246 9424

$$

ELEVEN

2 follow-up statements

997 
WWUS54 KSHV 270029
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
729 PM CDT TUE APR 26 2011

TXC315-270039-
/O.CAN.KSHV.TO.W.0042.000000T0000Z-110427T0100Z/
MARION TX-
729 PM CDT TUE APR 26 2011

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

LAT...LON 3271 9412 3269 9408 3270 9404 3277 9404
      3283 9397 3300 9382 3257 9373 3242 9410
      3247 9415 3262 9423
TIME...MOT...LOC 0029Z 243DEG 37KT 3252 9406

$$

LAC015-017-TXC203-270100-
/O.CON.KSHV.TO.W.0042.000000T0000Z-110427T0100Z/
CADDO LA-BOSSIER LA-HARRISON TX-
729 PM CDT TUE APR 26 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR HARRISON
COUNTY...AND BOSSIER AND CADDO PARISHES...

AT 724 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR JONESVILLE...OR 14 MILES EAST OF MARSHALL...MOVING
NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
BETHANY...CADDO LAKE...MOORINGSPORT...BLANCHARD...OIL CITY...DIXIE...
BELCHER...CAVETT...HOSSTON AND GILLIAM

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 3271 9412 3269 9408 3270 9404 3277 9404
      3283 9397 3300 9382 3257 9373 3242 9410
      3247 9415 3262 9423
TIME...MOT...LOC 0029Z 243DEG 37KT 3252 9406

$$

ELEVEN

238 
WWUS54 KSHV 270049
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
749 PM CDT TUE APR 26 2011

TXC203-270059-
/O.CAN.KSHV.TO.W.0042.000000T0000Z-110427T0100Z/
HARRISON TX-
749 PM CDT TUE APR 26 2011

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

LAT...LON 3277 9404 3283 9397 3300 9382 3257 9373
      3251 9387 3251 9388 3250 9390 3248 9396
      3252 9401 3266 9405
TIME...MOT...LOC 0049Z 243DEG 37KT 3261 9384

$$

LAC015-017-270100-
/O.CON.KSHV.TO.W.0042.000000T0000Z-110427T0100Z/
CADDO LA-BOSSIER LA-
749 PM CDT TUE APR 26 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 800 PM CDT FOR BOSSIER
AND CADDO PARISHES...

AT 743 PM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED NEAR BLANCHARD...OR 10 MILES NORTHWEST OF SHREVEPORT...MOVING
NORTHEAST AT 45 MPH.

OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
DIXIE...BELCHER...CAVETT...HOSSTON AND GILLIAM

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 3277 9404 3283 9397 3300 9382 3257 9373
      3251 9387 3251 9388 3250 9390 3248 9396
      3252 9401 3266 9405
TIME...MOT...LOC 0049Z 243DEG 37KT 3261 9384

$$

ELEVEN

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 26, 7:18 PM CDT	Severe Thunderstorm Warning	SHV	Caddo, De Soto	57 min
Apr 26, 7:22 PM CDT	Tornado Warning	SHV	Bossier, Caddo	23 min
Apr 26, 7:41 PM CDT	Tornado Warning	SHV	Caddo, De Soto	49 min
Apr 26, 7:44 PM CDT	Tornado Warning	SHV	Bossier, Webster	46 min
Apr 26, 8:25 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Caddo, De Soto, Red River, Webster	50 min
Apr 26, 8:30 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, De Soto, Natchitoches, Red River	45 min
Apr 26, 8:46 PM CDT	Tornado Warning	SHV	Bienville, Claiborne, Webster	32 min
Apr 26, 8:52 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	38 min
Apr 26, 9:05 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Lincoln	25 min
Apr 26, 9:10 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson	50 min
Apr 26, 9:16 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	44 min
Apr 26, 9:25 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Lincoln	35 min
Apr 26, 9:30 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	45 min
Apr 26, 9:41 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	49 min
Apr 26, 9:49 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita, Union	41 min
Apr 26, 9:56 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	49 min
Apr 26, 9:59 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Ouachita	46 min
Apr 26, 10:02 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln, Webster	43 min
Apr 26, 10:14 PM CDT	Severe Thunderstorm Warning	SHV	Union	46 min
Apr 26, 10:14 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	46 min
Apr 26, 10:18 PM CDT	Tornado Warning	SHV	Jackson, Ouachita	42 min
Apr 26, 10:37 PM CDT	Tornado Warning	SHV	Ouachita	23 min
Apr 26, 10:46 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Red River, Union	44 min
Apr 26, 10:51 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	54 min
Apr 26, 10:54 PM CDT	Tornado Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Winn	51 min
Apr 26, 10:57 PM CDT	Tornado Warning	SHV	Claiborne, Union	45 min
Apr 26, 11:14 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Jackson, Lincoln, Ouachita, Union	61 min
Apr 26, 11:28 PM CDT	Tornado Warning	SHV	Jackson, Ouachita, Union	47 min
Apr 26, 11:31 PM CDT	Flash Flood Warning	SHV	Jackson, Lincoln, Ouachita	4 hr
Apr 26, 11:34 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	56 min
Apr 27, 12:14 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, De Soto, Jackson, Natchitoches, Ouachita and 2 more	61 min
Apr 27, 12:23 AM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	67 min
Apr 27, 12:39 AM CDT	Tornado Warning	SHV	Natchitoches, Sabine	46 min
Apr 27, 1:05 AM CDT	Severe Thunderstorm Warning	SHV	Ouachita	44 min
Apr 27, 1:05 AM CDT	Tornado Warning	SHV	Caldwell, Grant, LaSalle, Natchitoches, Winn	55 min
Apr 27, 1:16 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Natchitoches and 3 more	59 min
Apr 27, 1:33 AM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Red River, Sabine	42 min
Apr 27, 1:44 AM CDT	Tornado Warning	SHV	Caldwell, LaSalle	31 min
Apr 27, 2:00 AM CDT	Tornado Warning	SHV	Sabine	47 min
Apr 27, 2:15 AM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle, Natchitoches, Winn	60 min
Apr 27, 3:27 AM CDT	Flash Flood Warning	SHV	Jackson, Ouachita	6 hr
Apr 27, 5:44 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	38 min
Apr 27, 7:30 AM CDT	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	12 hr
Apr 26, 7:13 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	47 min
Apr 26, 7:47 PM CDT	Tornado Warning	SHV	Gregg, Rusk, Smith, Upshur	43 min
Apr 26, 8:28 PM CDT	Tornado Warning	SHV	Gregg, Harrison, Smith	35 min
Apr 26, 8:49 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Rusk, Smith	41 min
Apr 26, 9:21 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion, Panola, Rusk	54 min
Apr 26, 11:03 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River, Titus	57 min
Apr 26, 11:20 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Sabine, San Augustine	55 min
Apr 27, 1:28 AM CDT	Tornado Warning	SHV	Angelina, San Augustine	32 min
Apr 27, 4:46 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Morris, Titus	59 min
Apr 27, 5:15 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	60 min

Nearby

Tornado Warnings in Louisiana, 2011 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.