Alert archive / Texas / Tornado Warnings in 2017

Tornado Warning 33, NWS Shreveport, LA

March 29, 2017Sabine County, Texas; Sabine Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 29, 2017, 4:54 PM CDT for Sabine County, Texas; Sabine Parish, Louisiana. It was in force for 66 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: Mar 29, 2017, 4:54 PM CDT (21:54 UTC)
Expired: Mar 29, 2017, 6:00 PM CDT
In force: 66 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Sabine Parish, LA, Sabine County, TX

The radar

The Ft Polk radar (KPOE), 53 km from the middle of the area, began a volume at 21:56 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
Mar 29, 5:18 PM CDT	TSTM WND DMG	18 Ssw Florien, LA	SEVERAL TREES DOWN ALONG HIGHWAY 191 NORTH OF THE DAM.

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
Mar 29, 2:11 PM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 9.9 hours before the alert went out and 134 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: 348 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 756 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 237 m²/s²
0-3 km storm-relative helicity: 273 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.6

Open this sounding in Storm Lab

The text

As transmitted.

209 
WFUS54 KSHV 292154
TORSHV
LAC085-TXC403-292300-
/O.NEW.KSHV.TO.W.0033.170329T2154Z-170329T2300Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
454 PM CDT WED MAR 29 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Sabine Parish in northwestern Louisiana...
  Southeastern Sabine County in eastern Texas...

* Until 600 PM CDT
    
* At 452 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Mayflower, or 8 miles northwest of Burkeville,
  moving northeast at 35 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...
  Florien, Fisher, Columbus and Fairmount. 

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 3154 9351 3137 9325 3136 9326 3136 9339
      3128 9344 3128 9353 3125 9354 3124 9356
      3123 9354 3119 9355 3117 9358 3118 9363
      3116 9383
TIME...MOT...LOC 2152Z 219DEG 29KT 3111 9373 

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

$$

06

1 follow-up statement

787 
WWUS54 KSHV 292235
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
535 PM CDT WED MAR 29 2017

TXC403-292244-
/O.CAN.KSHV.TO.W.0033.000000T0000Z-170329T2300Z/
Sabine TX-
535 PM CDT WED MAR 29 2017

...THE TORNADO WARNING FOR SOUTHEASTERN SABINE COUNTY 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 CDT for northwestern
Louisiana...and eastern Texas.

LAT...LON 3118 9360 3122 9360 3124 9362 3127 9362
      3128 9366 3132 9368 3135 9367 3136 9364
      3137 9365 3154 9351 3137 9325 3136 9339
      3128 9344 3128 9353 3125 9354 3124 9356
      3123 9354 3120 9355 3117 9358
TIME...MOT...LOC 2234Z 224DEG 20KT 3124 9355 

$$

LAC085-292300-
/O.CON.KSHV.TO.W.0033.000000T0000Z-170329T2300Z/
Sabine LA-
535 PM CDT WED MAR 29 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR
SOUTHEASTERN SABINE PARISH...
    
At 534 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Toledo Bend Dam, moving northeast 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. 

Locations impacted include...
Florien, Fisher and Columbus. 

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 3118 9360 3122 9360 3124 9362 3127 9362
      3128 9366 3132 9368 3135 9367 3136 9364
      3137 9365 3154 9351 3137 9325 3136 9339
      3128 9344 3128 9353 3125 9354 3124 9356
      3123 9354 3120 9355 3117 9358
TIME...MOT...LOC 2234Z 224DEG 20KT 3124 9355 

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
Mar 29, 4:13 AM CDT	Special Weather Statement	SHV	Camp, Franklin, Gregg, Smith, Upshur, Wood	47 min
Mar 29, 5:01 AM CDT	Special Weather Statement	SHV	Franklin, Red River, Titus	59 min
Mar 29, 5:03 AM CDT	Special Weather Statement	SHV	Camp, Gregg, Morris, Rusk, Smith, Upshur and 1 more	57 min
Mar 29, 5:51 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	54 min
Mar 29, 5:14 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	61 min
Mar 29, 5:23 PM CDT	Tornado Warning	SHV	Natchitoches, Sabine	52 min
Mar 29, 5:58 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches, Winn	62 min
Mar 29, 6:21 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Sabine, Winn	54 min

Nearby

Tornado Warnings in Texas, 2017 Tornado Warnings in Louisiana, 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.