Alert archive / Louisiana / Tornado Warnings in 2011

Tornado Warning 91, NWS Shreveport, LA

November 8, 2011Caddo Parish, De Soto Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Nov 8, 2011, 5:02 PM CST for Caddo Parish, De Soto Parish, Louisiana. It was in force for 43 min. 4 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: Nov 8, 2011, 5:02 PM CST (23:02 UTC)
Expired: Nov 8, 2011, 5:45 PM CST
In force: 43 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Caddo Parish, LA, De Soto Parish, LA

The radar

The Shreveport radar (KSHV), 28 km from the middle of the area, began a volume at 23:04 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, 5:20 PM CST	TSTM WND DMG	1 Nw Keachi, LA	DESOTO FD REPORTS TREES DOWN NEAR FOUR FORKS.
Nov 8, 5:28 PM CST	TORNADO	5 Se Stonewall, LA	TORNADO REPORTED ON THE GROUND BY AMATEUR RADIO...NEAR KICKAPOO OR BETWEEN KINGSTON AND FRIERSON.
Nov 8, 5:32 PM CST	TSTM WND DMG	Grand Cane, LA	POWER LINES DOWN
Nov 8, 5:32 PM CST	NON-TSTM WND DMG	Grand Cane, LA	POWER LINES DOWN

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

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.0 hours before the alert went out and 33 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.

716 
WFUS54 KSHV 082302
TORSHV
LAC017-031-082345-
/O.NEW.KSHV.TO.W.0091.111108T2302Z-111108T2345Z/

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

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHWESTERN CADDO PARISH IN NORTHWEST LOUISIANA...
  NORTHERN DE SOTO PARISH IN NORTHWEST LOUISIANA...

* UNTIL 545 PM CST

* AT 500 PM CST...THE PUBLIC REPORTED A TORNADO 8 MILES SOUTH OF
  STONEWALL...OR 12 MILES NORTHWEST OF MANSFIELD...MOVING NORTHEAST
  AT 35 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  KICKAPOO...GLOSTER...REEDS STORE...KINGSTON AND FRIERSON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER IN A NEARBY REINFORCED
BUILDING. AS A LAST RESORT...SEEK SHELTER IN A CULVERT...DITCH OR LOW
SPOT AND COVER YOUR HEAD WITH YOUR HANDS.

DO NOT USE YOUR CAR TO TRY TO OUTRUN A TORNADO. CARS ARE EASILY
TOSSED AROUND BY TORNADO WINDS. IF YOU ARE CAUGHT IN THE PATH OF A
TORNADO...LEAVE THE CAR AND GO TO A STRONG BUILDING. IF NO SAFE
STRUCTURE IS NEARBY...SEEK SHELTER IN A DITCH OR LOW SPOT AND COVER
YOUR HEAD.

&&

LAT...LON 3223 9402 3237 9371 3212 9353 3203 9388
TIME...MOT...LOC 2302Z 235DEG 29KT 3216 9385

$$

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, 5:35 PM CST	Tornado Warning	SHV	Bossier, Caddo, De Soto, Red River	25 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.