Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 29, NWS Shreveport, LA

March 24, 2017Natchitoches Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 24, 2017, 11:03 PM CDT for Natchitoches Parish, Winn Parish, Louisiana. It was in force for 28 min. 2 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: Mar 24, 2017, 11:03 PM CDT (04:03 UTC)
Expired: Mar 24, 2017, 11:31 PM CDT
In force: 28 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Natchitoches Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 70 km from the middle of the area, began a volume at 04:07 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 24, 11:05 PM CDT	TSTM WND DMG	3 Wnw Natchitoches, LA	SEVERAL TREES AND POWER LINES DOWN AS WELL AS SOME STRUCTURES DAMAGED ALONG HIGHWAY 504 AND 8 MILE LOOP.
Mar 24, 11:05 PM CDT	TSTM WND DMG	4 Nnw Provencal, LA	SEVERAL TREES AND POWER LINES DOWN AS WELL AS SEVERAL STRUCTURES WITH DAMAGE IN THE HAGEWOOD AREA ALONG HIGHWAY 117.

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 24, 9:23 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 00:00Z, 4.1 hours before the alert went out and 102 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: 24 J/kg
Mixed-layer CIN: -86 J/kg
Mixed-layer LCL: 1519 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 276 m²/s²
0-3 km storm-relative helicity: 418 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

980 
WFUS54 KSHV 250403
TORSHV
LAC069-127-250445-
/O.NEW.KSHV.TO.W.0029.170325T0403Z-170325T0445Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
1103 PM CDT FRI MAR 24 2017

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Central Natchitoches Parish in northwestern Louisiana...
  Southwestern Winn Parish in north central Louisiana...

* Until 1145 PM CDT

* At 1103 PM CDT, severe thunderstorms capable of producing both 
  tornadoes and extensive straight line wind damage were located 5 
  miles west of Natchitoches, moving northeast at 45 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. 

* These dangerous storms will be near...
  Natchitoches around 1110 PM CDT. 

Other locations impacted by this tornadic thunderstorm include
Calvin, Grand Ecore, Clear Lake, St. Maurice, Clarence, Hagewood,
Provencal and Atlanta.

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.

Motorists should not take shelter under highway overpasses. If you
cannot safely drive away from the tornado, as a last resort, either
park your vehicle and stay put, or abandon your vehicle and lie down
in a low lying area and protect yourself from flying debris.

Heavy rainfall may hide this tornado. Do not wait to see or hear the
tornado. TAKE COVER NOW!

&&

LAT...LON 3165 9323 3178 9329 3200 9280 3183 9269
TIME...MOT...LOC 0402Z 240DEG 40KT 3173 9319 

TORNADO...RADAR INDICATED
HAIL...0.00IN

$$

15

1 follow-up statement

439 
WWUS54 KSHV 250431
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1131 PM CDT FRI MAR 24 2017

LAC069-127-250440-
/O.CAN.KSHV.TO.W.0029.000000T0000Z-170325T0445Z/
Natchitoches LA-Winn LA-
1131 PM CDT FRI MAR 24 2017

...THE TORNADO WARNING FOR CENTRAL NATCHITOCHES AND SOUTHWESTERN WINN
PARISHES IS CANCELLED...
    
The tornado threat has diminished and the Tornado Warning has been 
cancelled. However, damaging winds remain likely and a Severe 
Thunderstorm Warning remains in effect for the area.  

A tornado watch remains in effect until 300 AM CDT for north central
and northwestern Louisiana.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Natchitoches and Winn Parishes until 12 AM CDT. 

LAT...LON 3165 9323 3178 9329 3200 9280 3183 9269
TIME...MOT...LOC 0429Z 240DEG 40KT 3189 9287 

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 24, 8:02 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	43 min
Mar 24, 9:00 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	45 min
Mar 24, 9:32 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	43 min
Mar 24, 9:38 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Sabine	37 min
Mar 24, 10:09 PM CDT	Tornado Warning	SHV	De Soto, Sabine	51 min
Mar 24, 10:13 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	47 min
Mar 24, 10:46 PM CDT	Tornado Warning	SHV	Bienville, Bossier, De Soto, Red River	44 min
Mar 24, 11:00 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Red River, Sabine and 1 more	60 min
Mar 24, 11:38 PM CDT	Areal Flood Advisory	SHV	Sabine	3 hr
Mar 25, 12:00 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caldwell, Grant, Jackson, Natchitoches, Ouachita and 1 more	60 min
Mar 25, 12:03 AM CDT	Tornado Warning	SHV	Jackson	27 min

Nearby

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.