Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 8, NWS Shreveport, LA

April 4, 20114 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 4, 2011, 2:39 PM CDT for 4 parishes in Louisiana. It was in force for 36 min. 5 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 4, 2011, 2:39 PM CDT (19:39 UTC)
Expired: Apr 4, 2011, 3:15 PM CDT
In force: 36 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Caldwell Parish, LA, Grant Parish, LA, LaSalle Parish, LA, Winn Parish, LA

What was reported inside it

Time	Report	Where	Remark
Apr 4, 2:41 PM CDT	TORNADO	8 Wnw Jena, LA	EMERGENCY MANAGER REPORTS NUMEROUS TREES AND POWERLINES DOWN NORTHWEST OF THE COMMUNITY OF LITTLE CREEK.
Apr 4, 2:42 PM CDT	TORNADO	3 Ssw Georgetown, LA	AN EF-1 TORNADO WITH ESTIMATED WINDS NEAR 95 MPH TOUCHED DOWN JUST SOUTH OF GEORGETOWN WEST OF HIGHWAY 165. THIS TORNADO CONTINUED NORTHEAST INTO THE SELMA COMMUNITY AND INTO WESTERN LA SALLE PARISH ACROSS THE ZENORIA COMMUNITY. DAMAGE CONSISTED OF MANY UPROOT
Apr 4, 2:52 PM CDT	TORNADO	5 Nnw Jena, LA	EMERGENCY MANAGER REPORTS NUMEROUS TREES AND POWERLINES DOWN...WITH SOME HOUSES DAMAGED.
Apr 4, 2:58 PM CDT	TORNADO	8 N Jena, LA	THE TORNADO SNAPPED/UPROOTED NUMEROUS TREES AFTER IT TOUCHED DOWN JUST SOUTH OF IP 13 WEST OF BRASHER ROAD. IT CONTINUED NORTHEAST ACROSS HIGHWAY 126 INTO AN UPOPULATED AREA IN NORTHEAST LASALLE PARISH. MAXIMUM WIDTH WAS 225 YARDS, WITH A PATH LENGTH OF 7.9 MI
Apr 4, 3:07 PM CDT	TORNADO	8 Ese Olla, LA	EMERGENCY MANAGER REPORTS NUMEROUS TREES AND POWERLINES DOWN ACROSS THE AREA...SOME HOUSES ARE DAMAGED...ALL ACROSS THE NORTHEAST CORNER OF LA SALLE PARISH.

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 4, 7:44 AM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 7.7 hours before the alert went out and 174 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: 1653 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 738 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 196 m²/s²
0-3 km storm-relative helicity: 292 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.2

Open this sounding in Storm Lab

The text

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

066 
WFUS54 KSHV 041939
TORSHV
LAC021-043-059-127-042030-
/O.NEW.KSHV.TO.W.0008.110404T1939Z-110404T2030Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
239 PM CDT MON APR 4 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN CALDWELL PARISH IN NORTH CENTRAL LOUISIANA...
  NORTHEASTERN GRANT PARISH IN NORTH CENTRAL LOUISIANA...
  NORTHERN LA SALLE PARISH IN NORTH CENTRAL LOUISIANA...
  EAST CENTRAL WINN PARISH IN NORTH CENTRAL LOUISIANA...

* UNTIL 330 PM CDT

* AT 237 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 15 MILES
  SOUTHWEST OF OLLA...OR 18 MILES SOUTHEAST OF WINNFIELD...MOVING
  EAST AT 45 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  MIDWAY...JENA...CLARKS AND GRAYSON...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

&&

LAT...LON 3210 9187 3209 9191 3206 9189 3198 9187
      3196 9189 3193 9189 3192 9200 3168 9200
      3161 9249 3189 9253 3215 9188 3214 9187
TIME...MOT...LOC 1940Z 251DEG 37KT 3176 9238

$$

04

2 follow-up statements

515 
WWUS54 KSHV 042009
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
309 PM CDT MON APR 4 2011

LAC021-043-127-042019-
/O.CAN.KSHV.TO.W.0008.000000T0000Z-110404T2030Z/
CALDWELL LA-WINN LA-GRANT LA-
309 PM CDT MON APR 4 2011

...THE TORNADO WARNING FOR GRANT...WINN AND CALDWELL PARISHES IS
CANCELLED...

LAT...LON 3166 9217 3189 9217 3193 9200 3169 9200
TIME...MOT...LOC 2009Z 253DEG 57KT 3185 9193

$$

LAC059-042030-
/O.CON.KSHV.TO.W.0008.000000T0000Z-110404T2030Z/
LA SALLE LA-
309 PM CDT MON APR 4 2011

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 330 PM CDT FOR LA SALLE
PARISH...

AT 307 PM CDT...LOCAL LAW ENFORCEMENT REPORTED A TORNADO.  THIS
TORNADO WAS LOCATED 14 MILES NORTHEAST OF JENA...OR 19 MILES SOUTH OF
COLUMBIA...MOVING EAST AT 65 MPH. DAMAGE HAS ALREADY BEEN REPORTED 
WITH THIS STORM NEAR GEORGETOWN LOUISIANA.

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 3166 9217 3189 9217 3193 9200 3169 9200
TIME...MOT...LOC 2009Z 253DEG 57KT 3185 9193

$$

04

450 
WWUS54 KSHV 042015
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
315 PM CDT MON APR 4 2011

LAC059-042025-
/O.CAN.KSHV.TO.W.0008.000000T0000Z-110404T2030Z/
LA SALLE LA-
315 PM CDT MON APR 4 2011

...THE TORNADO WARNING FOR LA SALLE PARISH IS CANCELLED...

THE STORM HAS MOVED OUT OF THE PARISH.

LAT...LON 3166 9217 3189 9217 3193 9200 3169 9200
TIME...MOT...LOC 2015Z 262DEG 43KT 3185 9185

$$

04

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 4, 8:29 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	61 min
Apr 4, 9:21 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	54 min
Apr 4, 9:33 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	57 min
Apr 4, 9:46 AM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Webster	59 min
Apr 4, 10:10 AM CDT	Areal Flood Advisory	SHV	Bossier, Caddo, Webster	2 hr
Apr 4, 12:17 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Jackson, Natchitoches, Winn	43 min
Apr 4, 1:24 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Jackson, LaSalle, Natchitoches, Winn	51 min
Apr 4, 2:11 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, Jackson, LaSalle, Winn	49 min
Apr 4, 2:49 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	26 min

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.