Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 92, NWS Shreveport, LA

November 8, 20114 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 5:35 PM CST for 4 parishes in Louisiana. It was in force for 25 min. 1 report 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: Nov 8, 2011, 5:35 PM CST (23:35 UTC)
Expired: Nov 8, 2011, 6:00 PM CST
In force: 25 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bossier Parish, LA, Caddo Parish, LA, De Soto Parish, LA, Red River Parish, LA

The radar

The Shreveport radar (KSHV), 36 km from the middle of the area, began a volume at 23:38 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
Nov 8, 5:50 PM CST	TORNADO	13 Se Bossier City, LA	AN EF0 TORNADO TOUCHED DOWN ALONG HWY 1 N OF ELLERBY RD...WHERE A FEW TREES WERE SNAPPED. A SPOTTER ALSO FILMED THE TORNADO AS IT CROSSED THE RED RIVER AND APPROACHED THE COMMUNTIY OF ELM GROVE. DAMAGE WAS MINIMAL AND LIMITED TO TREES. THE TORNADO LIFTED AS IT

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
Nov 8, 10:49 AM CST	Tornado Watch	SPC	7 hr
Nov 8, 5:30 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.6 hours before the alert went out and 30 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: 12 J/kg
Mixed-layer CIN: -185 J/kg
Mixed-layer LCL: 496 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 296 m²/s²
0-3 km storm-relative helicity: 361 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

496 
WFUS54 KSHV 082335
TORSHV
LAC015-017-031-081-090000-
/O.NEW.KSHV.TO.W.0092.111108T2335Z-111109T0000Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
535 PM CST TUE NOV 8 2011

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN BOSSIER PARISH IN NORTHWEST LOUISIANA...
  SOUTHEASTERN CADDO PARISH IN NORTHWEST LOUISIANA...
  NORTH CENTRAL DE SOTO PARISH IN NORTHWEST LOUISIANA...
  NORTHWESTERN RED RIVER PARISH IN NORTHWEST LOUISIANA...

* UNTIL 600 PM CST

* AT 530 PM CST...TRAINED WEATHER SPOTTERS REPORTED A TORNADO 
BETWEEN KINGSTON AND FRIERSON...MOVING  NORTHEAST AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  ROBSON...CASPIANA...TAYLORTOWN...NINOCK...MC DADE...ELM GROVE...
  KORAN AND CURTIS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF IN MOBILE HOMES OR VEHICLES...EVACUATE THEM AND GET INSIDE A
STURDY SHELTER. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST
DITCH OR OTHER LOW SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

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 3226 9384 3250 9347 3245 9344 3241 9344
      3240 9341 3238 9343 3236 9340 3231 9343
      3225 9341 3224 9343 3224 9331 3221 9330
      3210 9376
TIME...MOT...LOC 2333Z 231DEG 25KT 3224 9368

$$

VII

The office that day

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

Issued	Product	Office	Counties	Lasted
Nov 8, 3:58 PM CST	Severe Thunderstorm Warning	SHV	De Soto	47 min
Nov 8, 4:30 PM CST	Tornado Warning	SHV	De Soto	30 min
Nov 8, 5:02 PM CST	Tornado Warning	SHV	Caddo, De Soto	43 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; radar from the NEXRAD Level II archive.