Alert archive / Louisiana / Tornado Warnings in 2016

Tornado Warning 29, NWS Shreveport, LA

April 11, 2016Bienville Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 11, 2016, 6:51 PM CDT for Bienville Parish, Louisiana. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 11, 2016, 6:51 PM CDT (23:51 UTC)
Expired: Apr 11, 2016, 7:15 PM CDT
In force: 24 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Bienville Parish, LA

The radar

The Shreveport radar (KSHV), 72 km from the middle of the area, began a volume at 23:50 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.

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 11, 1:05 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.9 hours before the alert went out and 65 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: 520 J/kg
Mixed-layer CIN: -128 J/kg
Mixed-layer LCL: 585 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 389 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.2

Open this sounding in Storm Lab

The text

As transmitted.

458 
WFUS54 KSHV 112351
TORSHV
LAC013-120015-
/O.NEW.KSHV.TO.W.0029.160411T2351Z-160412T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
651 PM CDT MON APR 11 2016

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  CENTRAL BIENVILLE PARISH IN NORTHWESTERN LOUISIANA...

* UNTIL 715 PM CDT
    
* AT 650 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
  WAS LOCATED 7 MILES EAST OF RINGGOLD...OR 22 MILES SOUTH OF MINDEN...
  MOVING EAST AT 30 MPH.

  HAZARD...TORNADO. 

  SOURCE...RADAR INDICATED ROTATION. 

  IMPACT...FLYING DEBRIS WILL BE DANGEROUS TO THOSE CAUGHT WITHOUT 
           SHELTER. MOBILE HOMES WILL BE DAMAGED OR DESTROYED. 
           DAMAGE TO ROOFS...WINDOWS...AND VEHICLES WILL OCCUR.  TREE 
           DAMAGE IS LIKELY. 

* LOCATIONS IMPACTED INCLUDE...
  LUCKY...CASTOR...BIENVILLE...JAMESTOWN...BRYCELAND AND BRICE. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! MOVE TO A BASEMENT OR AN INTERIOR ROOM ON THE LOWEST
FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF YOU ARE OUTDOORS...IN A
MOBILE HOME...OR IN A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER
AND PROTECT YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3226 9318 3235 9322 3245 9296 3229 9290
TIME...MOT...LOC 2350Z 252DEG 27KT 3232 9315 

TORNADO...RADAR INDICATED
HAIL...<.75IN

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 11, 2:11 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	49 min
Apr 11, 3:29 PM CDT	Flash Flood Warning	SHV	Bienville, Claiborne, Lincoln, Ouachita, Union	9 hr
Apr 11, 4:14 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Webster	46 min
Apr 11, 4:23 PM CDT	Special Weather Statement	SHV	Bossier, Caddo	52 min
Apr 11, 4:29 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	46 min
Apr 11, 5:06 PM CDT	Special Weather Statement	SHV	Claiborne, Webster	39 min
Apr 11, 5:22 PM CDT	Flash Flood Warning	SHV	Bossier, Claiborne, Union, Webster	6 hr
Apr 11, 5:35 PM CDT	Severe Thunderstorm Warning	SHV	Lincoln, Ouachita, Union	42 min
Apr 11, 5:42 PM CDT	Special Weather Statement	SHV	Lincoln	48 min
Apr 11, 6:05 PM CDT	Special Weather Statement	SHV	Ouachita	25 min
Apr 11, 6:15 PM CDT	Special Weather Statement	SHV	Bienville	45 min
Apr 11, 6:31 PM CDT	Special Weather Statement	SHV	Lincoln, Union	59 min
Apr 11, 6:42 PM CDT	Flash Flood Warning	SHV	Bienville, Jackson, Lincoln, Ouachita	6 hr

Nearby

Tornado Warnings in Louisiana, 2016 Every tornado warning in 2016 Tornadoes in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.