Alert archive / Louisiana / Tornado Warnings in 2017

Tornado Warning 6, NWS Shreveport, LA

January 21, 2017Grant Parish, Natchitoches Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Jan 21, 2017, 5:37 PM CST for Grant Parish, Natchitoches Parish, Winn Parish, Louisiana. It was in force for 38 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, 5:37 PM CST (23:37 UTC)
Expired: Jan 21, 2017, 6:15 PM CST
In force: 38 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Grant Parish, LA, Natchitoches Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 63 km from the middle of the area, began a volume at 23:36 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, 5:50 PM CST	HAIL 1	Natchitoches, LA
Jan 21, 5:55 PM CST	TSTM WND DMG	1 Ne Natchez, LA	ROOF IS OFF OF A HOME ALONG PATRICK ROAD.
Jan 21, 5:55 PM CST	TSTM WND DMG	2 Ne Natchez, LA	* 1 INJ * TWO HOMES DESTROYED ALONG PATRICK ROAD AND HWY 494. A MAN HAS A BROKEN ARM.
Jan 21, 5:56 PM CST	TORNADO	1 Ne Natchez, LA	* 1 INJ * AN EF2 TORNADO TOUCHED DOWN NORTHEAST OF NATCHEZ UPROOTING AND/OR SNAPPING NUMEROUS TREES AND DOWNING POWERLINES. 5 HOMES SUFFERED SIGNIFICANT DAMAGE. SEVERAL OUTBUILDINGS WERE ALSO SEVERELY DAMAGED IN AND AROUND THE CANE RIVER. THE STORM APPEARE
Jan 21, 5:58 PM CST	TORNADO	2 E Natchez, LA	PICTURE OF A TORNADO WITH DEBRIS TAKEN BY PUBLIC, ALONG CEDAR BEND ROAD.

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, 11.6 hours before the alert went out and 109 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.

196 
WFUS54 KSHV 212337
TORSHV
LAC043-069-127-220015-
/O.NEW.KSHV.TO.W.0006.170121T2337Z-170122T0015Z/

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

The National Weather Service in Shreveport has issued a

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

* Until 615 PM CST
    
* At 536 PM CST, a severe thunderstorm capable of producing a tornado
  was located near Natchitoches, 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...
  Natchitoches, Montgomery, Provencal, Natchez, Clarence, Atlanta,
  Flora, Grand Ecore, Clear Lake, Bermuda, St. Maurice and Hagewood.

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 3157 9315 3174 9326 3197 9285 3176 9271
TIME...MOT...LOC 2336Z 240DEG 30KT 3171 9308 

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

$$

19

1 follow-up statement

155 
WWUS54 KSHV 212354
SVSSHV

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

LAC043-069-127-220015-
/O.CON.KSHV.TO.W.0006.000000T0000Z-170122T0015Z/
Grant LA-Natchitoches LA-Winn LA-
554 PM CST SAT JAN 21 2017

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 615 PM CST FOR
NORTHWESTERN GRANT...CENTRAL NATCHITOCHES AND SOUTHWESTERN WINN
PARISHES...
    
At 554 PM CST, a severe thunderstorm capable of producing a tornado
was located 8 miles north of Montgomery, or 10 miles east of
Natchitoches, 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...
Natchitoches, Natchez, Clarence, Atlanta and St. Maurice. 

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 3165 9306 3176 9313 3197 9285 3178 9272
TIME...MOT...LOC 2354Z 240DEG 30KT 3179 9293 

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

$$

19

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, 5:30 PM CST	Tornado Warning	SHV	Bossier, Webster	60 min
Jan 21, 5:33 PM CST	Tornado Warning	SHV	Bossier, Claiborne, Webster	42 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

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.