Alert archive / Louisiana / Tornado Warnings in 2015

Tornado Warning 9, NWS Shreveport, LA

April 19, 2015Bossier Parish, Webster Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Apr 19, 2015, 6:47 PM CDT for Bossier Parish, Webster Parish, Louisiana. It was in force for 39 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 19, 2015, 6:47 PM CDT (23:47 UTC)
Expired: Apr 19, 2015, 7:26 PM CDT
In force: 39 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Bossier Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 53 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 19, 2:31 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Apr 19, 5:46 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.8 hours before the alert went out and 45 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 976 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 130 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

605 
WFUS54 KSHV 192347
TORSHV
LAC015-119-200045-
/O.NEW.KSHV.TO.W.0009.150419T2347Z-150420T0045Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE SHREVEPORT LA
647 PM CDT SUN APR 19 2015

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A

* TORNADO WARNING FOR...
  EAST CENTRAL BOSSIER PARISH IN NORTHWESTERN LOUISIANA...
  CENTRAL WEBSTER PARISH IN NORTHWESTERN LOUISIANA...

* UNTIL 745 PM CDT
    
* AT 647 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 8 MILES SOUTHWEST OF COTTON VALLEY...OR 16
  MILES NORTHEAST OF BOSSIER CITY...MOVING EAST AT 30 MPH.

  HAZARD...TORNADO AND QUARTER SIZE HAIL. 

  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. 

* THIS DANGEROUS STORM WILL BE NEAR...
  COTTON VALLEY AROUND 705 PM CDT.

OTHER LOCATIONS IMPACTED BY THIS TORNADIC THUNDERSTORM INCLUDE
EVERGREEN...COUCHWOOD...IVAN...BELLEVUE AND LETON.

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 OR IN
A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3266 9359 3280 9363 3289 9324 3272 9324
      3272 9319 3268 9319
TIME...MOT...LOC 2347Z 262DEG 28KT 3274 9355 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

06

2 follow-up statements

787 
WWUS54 KSHV 200008
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
708 PM CDT SUN APR 19 2015

LAC015-200015-
/O.CAN.KSHV.TO.W.0009.000000T0000Z-150420T0045Z/
BOSSIER LA-
708 PM CDT SUN APR 19 2015

...THE TORNADO WARNING FOR EAST CENTRAL BOSSIER PARISH IS
CANCELLED...
    
THE TORNADIC THUNDERSTORM WHICH PROMPTED THE WARNING HASMOVED OUT OF 
THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FOR NORTHWESTERN
LOUISIANA.

LAT...LON 3268 9319 3267 9345 3276 9345 3276 9347
      3278 9347 3280 9346 3284 9346 3289 9324
      3272 9324 3272 9319
TIME...MOT...LOC 0005Z 262DEG 28KT 3276 9337 

$$

LAC119-200045-
/O.CON.KSHV.TO.W.0009.000000T0000Z-150420T0045Z/
WEBSTER LA-
708 PM CDT SUN APR 19 2015

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 745 PM CDT FOR CENTRAL
WEBSTER PARISH...
    
AT 705 PM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO
WAS LOCATED NEAR COTTON VALLEY...OR 10 MILES NORTHWEST OF MINDEN... 
MOVING EAST AT 30 MPH. THIS SEVERE THUNDERSTORM HAS SHOWN SOME 
DECREASE IN THE ROTATION BUT WILL BE CAPABLE OF PRODUCING A 
TORNADO. 

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. 

THIS TORNADIC THUNDERSTORM WILL REMAIN OVER MAINLY RURAL AREAS OF
CENTRAL WEBSTER PARISH...INCLUDING THE FOLLOWING LOCATIONS...
COUCHWOOD...EVERGREEN AND LETON.

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 OR IN
A VEHICLE...MOVE TO THE CLOSEST SUBSTANTIAL SHELTER AND PROTECT
YOURSELF FROM FLYING DEBRIS.

&&

LAT...LON 3268 9319 3267 9345 3276 9345 3276 9347
      3278 9347 3280 9346 3284 9346 3289 9324
      3272 9324 3272 9319
TIME...MOT...LOC 0005Z 262DEG 28KT 3276 9337 

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

$$

06

553 
WWUS54 KSHV 200026
SVSSHV

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
726 PM CDT SUN APR 19 2015

LAC119-200035-
/O.CAN.KSHV.TO.W.0009.000000T0000Z-150420T0045Z/
WEBSTER LA-
726 PM CDT SUN APR 19 2015

...THE TORNADO WARNING FOR CENTRAL WEBSTER PARISH IS CANCELLED...
        
THE STORM WHICH PROMPTED THE WARNING HAS WEAKENED BELOW SEVERE LIMITS
AND EXITED THE WARNED AREA. THEREFORE THE WARNING HAS BEEN CANCELLED.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT FOR NORTHWESTERN
LOUISIANA.

LAT...LON 3268 9319 3267 9345 3276 9345 3276 9347
      3278 9347 3280 9346 3284 9346 3289 9324
      3272 9324 3272 9319
TIME...MOT...LOC 0022Z 262DEG 28KT 3278 9318 

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 12:25 AM CDT	Special Weather Statement	SHV	Caddo	50 min
Apr 19, 12:37 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	23 min
Apr 19, 1:12 AM CDT	Special Weather Statement	SHV	Bossier, Webster	48 min
Apr 19, 1:29 AM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	46 min
Apr 19, 1:36 AM CDT	Special Weather Statement	SHV	Bienville, Red River	54 min
Apr 19, 2:22 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Red River, Winn	38 min
Apr 19, 2:58 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Grant, Jackson, LaSalle, Lincoln and 1 more	47 min
Apr 19, 3:34 AM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, LaSalle, Lincoln, Ouachita, Union and 1 more	56 min
Apr 19, 6:00 PM CDT	Severe Thunderstorm Warning	SHV	Caddo, De Soto, Red River	60 min
Apr 19, 6:09 PM CDT	Special Weather Statement	SHV	Bossier	51 min
Apr 19, 6:17 PM CDT	Tornado Warning	SHV	Caddo, De Soto, Red River	28 min
Apr 19, 6:24 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	48 min
Apr 19, 6:29 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	31 min
Apr 19, 6:32 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	28 min
Apr 19, 6:56 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	34 min

Nearby

Tornado Warnings in Louisiana, 2015 Every tornado warning in 2015 Tornadoes in 2015

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.