Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 36, NWS Shreveport, LA

April 26, 2011LaSalle Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 26, 2011, 2:31 AM CDT for LaSalle Parish, Louisiana. It was in force for 29 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, 2:31 AM CDT (07:31 UTC)
Expired: Apr 26, 2011, 3:00 AM CDT
In force: 29 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County LaSalle Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 26, 2:40 AM CDT	TSTM WND DMG	2 N Jena, LA	TREE REPORTED DOWN ON HIGHWAY 503
Apr 26, 2:40 AM CDT	TORNADO	2 N Jena, LA	DAMAGE REPORTS FROM EMERGENCY MANAGER OF TREES AND POWERLINES DOWN IN SUMMERVILLE APPEARS TO BE TORNADO DAMAGE.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 7.5 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: 782 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 1445 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 262 m²/s²
0-3 km storm-relative helicity: 553 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 15.0

Open this sounding in Storm Lab

The text

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

549 
WFUS54 KSHV 260731
TORSHV
LAC059-260800-
/O.NEW.KSHV.TO.W.0036.110426T0731Z-110426T0800Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN LA SALLE PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 300 AM CDT

* AT 229 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR MIDWAY...OR
  25 MILES NORTHEAST OF PINEVILLE...MOVING EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  JENA...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUAARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 3153 9224 3166 9226 3179 9201 3178 9200
      3174 9200 3156 9200
TIME...MOT...LOC 0731Z 260DEG 38KT 3163 9214

$$

24

1 follow-up statement

086 
WWUS54 KSHV 260751
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
251 AM CDT TUE APR 26 2011

LAC059-260800-
/O.CON.KSHV.TO.W.0036.000000T0000Z-110426T0800Z/
LA SALLE LA-
251 AM CDT TUE APR 26 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 300 AM CDT FOR LA SALLE
PARISH...

AT 246 AM CDT...USING DOPPLER RADAR...NATIONAL WEATHER SERVICE
METEOROLOGISTS CONTINUED TO DETECT A TORNADO.  THIS TORNADO WAS
LOCATED OVER CATAHOULA PARISH...OR 32 MILES SOUTH OF COLUMBIA...
MOVING EAST AT 45 MPH.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IN ADDITION TO THE TORNADO...THIS STORM IS CAPABLE OF PRODUCING 
QUARTER SIZE HAIL AND DESTRUCTIVE STRAIGHT LINE WINDS.

&&

LAT...LON 3158 9209 3172 9211 3179 9201 3178 9200
      3156 9200
TIME...MOT...LOC 0751Z 260DEG 38KT 3166 9190

$$

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 8:45 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	60 min
Apr 25, 9:28 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	62 min
Apr 25, 9:45 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	17 min
Apr 26, 12:35 AM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Winn	41 min
Apr 26, 2:12 AM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	48 min
Apr 26, 4:03 AM CDT	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	27 hr
Apr 26, 9:49 AM CDT	River Flood Warning	SHV	Webster	7 days

Nearby

Tornado Warnings in Louisiana, 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.