Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 4, NWS Shreveport, LA

January 21, 2017Bossier Parish, Webster Parish, Louisiana; Columbia County, Lafayette County, Arkansas

NWS Shreveport, LA issued this tornado warning at Jan 21, 2017, 5:30 PM CST for Bossier Parish, Webster Parish, Louisiana; Columbia County, Lafayette County, Arkansas. It was in force for 60 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: Jan 21, 2017, 5:30 PM CST (23:30 UTC)
Expired: Jan 21, 2017, 6:30 PM CST
In force: 60 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Columbia County, AR, Lafayette County, AR, Bossier Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 70 km from the middle of the area, began a volume at 23:34 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
Jan 21, 5:35 PM CST	TSTM WND DMG	8 Nne Plain Dealing, LA	TREES DOWN ACROSS HWY 2. .
Jan 21, 5:50 PM CST	HAIL 1.75	Springhill, LA	GOLF BALL SIZE HAIL REPORTED IN SPRINGHILL.
Jan 21, 5:50 PM CST	HAIL 2.5	Springhill, LA	PHOTO OF LARGE HAIL VIA KSLA FACEBOOK.
Jan 21, 5:55 PM CST	HAIL 1.75	5 E Taylor, AR	GOLF BALL SIZE HAIL ALONG HWY 160 EAST OF TAYLOR.
Jan 21, 6:05 PM CST	HAIL 2.5	8 Ne Springhill, AR	PHOTO OF LARGE HAIL NEAR TAYLOR ARKANSAS VIA KTAL TODD WARREN FACEBOOK.

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
Jan 21, 3:41 PM CST	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.5 hours before the alert went out and 63 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: 20 J/kg
Mixed-layer CIN: -323 J/kg
Mixed-layer LCL: 1223 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 12 m²/s²
0-3 km storm-relative helicity: 81 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.1

Open this sounding in Storm Lab

The text

As transmitted.

223 
WFUS54 KSHV 212330
TORSHV
ARC027-073-LAC015-119-220030-
/O.NEW.KSHV.TO.W.0004.170121T2330Z-170122T0030Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
530 PM CST SAT JAN 21 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  South central Lafayette County in southwestern Arkansas...
  Southwestern Columbia County in southwestern Arkansas...
  Northwestern Webster Parish in northwestern Louisiana...
  North central Bossier Parish in northwestern Louisiana...

* Until 630 PM CST
    
* At 529 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Cullen, or near Springhill, moving northeast at 25
  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...
  Sarepta around 535 PM CST. 
  Cullen around 540 PM CST. 
  Springhill and Welcome around 545 PM CST. 

Other locations impacted by this tornadic thunderstorm include State
Line, Horsehead and Walkerville.

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 3285 9355 3300 9369 3324 9337 3304 9320
TIME...MOT...LOC 2329Z 241DEG 22KT 3294 9353 

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

$$

06

1 follow-up statement

030 
WWUS54 KSHV 212358
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
558 PM CST SAT JAN 21 2017

LAC015-220007-
/O.CAN.KSHV.TO.W.0004.000000T0000Z-170122T0030Z/
Bossier LA-
558 PM CST SAT JAN 21 2017

...THE TORNADO WARNING FOR NORTH CENTRAL BOSSIER PARISH IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has  moved out 
of the warned area. Therefore, the warning has been cancelled.

A tornado watch remains in effect until 900 PM CST for southwestern
Arkansas...and northwestern Louisiana.

LAT...LON 3292 9341 3310 9355 3324 9337 3304 9320
TIME...MOT...LOC 2357Z 239DEG 21KT 3302 9337 

$$

ARC027-073-LAC119-220030-
/O.CON.KSHV.TO.W.0004.000000T0000Z-170122T0030Z/
Lafayette AR-Columbia AR-Webster LA-
558 PM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 630 PM CST FOR SOUTH
CENTRAL LAFAYETTE...SOUTHWESTERN COLUMBIA COUNTIES IN SOUTHWESTERN
ARKANSAS AND NORTH CENTRAL WEBSTER PARISHES...
    
At 557 PM CST, a severe thunderstorm capable of producing a tornado
was located near Springhill, moving northeast at 25 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. 

Locations impacted include...
Springhill, Cullen, Taylor, Bussey, Smithland, Welcome, Horsehead and
Walkerville.

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.

If a tornado or other severe weather is spotted, report it to the
National Weather Service or your local nearest law enforcement agency
who will send your report. This act may save lives of others in the
path of dangerous weather.

&&

LAT...LON 3292 9341 3310 9355 3324 9337 3304 9320
TIME...MOT...LOC 2357Z 239DEG 21KT 3302 9337 

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

$$

06

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 21, 9:44 AM CST	River Flood Warning	SHV	Caldwell, Grant, LaSalle, Winn	4 days
Jan 21, 2:51 PM CST	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	34 hr
Jan 21, 4:21 PM CST	Special Weather Statement	SHV	Caddo	54 min
Jan 21, 4:44 PM CST	Tornado Warning	SHV	Bossier, Caddo	61 min
Jan 21, 4:49 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Webster	56 min
Jan 21, 4:56 PM CST	Tornado Warning	SHV	Bossier, Caddo, Webster	49 min
Jan 21, 5:03 PM CST	Severe Thunderstorm Warning	SHV	Caddo	57 min
Jan 21, 5:33 PM CST	Tornado Warning	SHV	Bossier, Claiborne, Webster	42 min
Jan 21, 5:37 PM CST	Tornado Warning	SHV	Grant, Natchitoches, Winn	38 min
Jan 21, 5:41 PM CST	Tornado Warning	SHV	Bossier, Caddo	49 min
Jan 21, 5:46 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo	44 min
Jan 21, 5:34 PM CST	Severe Thunderstorm Warning	SHV	Little River	56 min

Nearby

Tornado Warnings in Louisiana, 2017 Tornado Warnings in Arkansas, 2017 Every tornado warning in 2017 Tornadoes in 2017

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.