Alert archive / Louisiana / Tornado Warnings in 2020

Tornado Warning 13, NWS Shreveport, LA

January 11, 2020Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Jan 11, 2020, 2:34 AM CST for Union Parish, Louisiana. It was in force for 41 min. 3 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 11, 2020, 2:34 AM CST (08:34 UTC)
Expired: Jan 11, 2020, 3:15 AM CST
In force: 41 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

County Union Parish, LA

The radar

The Shreveport radar (KSHV), 164 km from the middle of the area, began a volume at 08:34 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 11, 2:40 AM CST	TSTM WND DMG	5 Sw Marion, LA	TREES AND POWER LINES REPORTED DOWN LA 33 NEAR QUIGLEY.
Jan 11, 2:45 AM CST	TSTM WND DMG	7 Ese Spearsville, LA	UNION PARISH SHERIFF REPORTS MULTIPLE TREES DOWN OF LA HWY 15 BETWEEN FARMERVILLE AND SPEARSVILLE. HIGHWAY BLOCKED IN SEVERAL PLACES BY BOTH TREES AND POWER LINES.
Jan 11, 2:55 AM CST	TSTM WND DMG	6 Sw Marion, LA	UNION PARISH SHERIFF REPORTS MULTIPLE TREES DOWN ON LA HWY 33 BETWEEN FARMERVILLE AND MARION. HIGHWAY BLOCKED IN SEVERAL PLACES BY BOTH TREES AND POWER LINES.

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 11, 12:28 AM CST	Tornado Watch	SPC	8 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 8.6 hours before the alert went out and 155 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: 703 J/kg
Mixed-layer CIN: -35 J/kg
Mixed-layer LCL: 813 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 379 m²/s²
0-3 km storm-relative helicity: 620 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 6.1

Open this sounding in Storm Lab

The text

As transmitted.

876 
WFUS54 KSHV 110834
TORSHV
LAC111-110915-
/O.NEW.KSHV.TO.W.0013.200111T0834Z-200111T0915Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
234 AM CST Sat Jan 11 2020

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Northern Union Parish in north central Louisiana...

* Until 315 AM CST.
    
* At 233 AM CST, a severe thunderstorm capable of producing a tornado
  was located 7 miles north of Farmerville, or 15 miles southwest of
  Huttig, moving east at 50 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.

* This tornadic thunderstorm will remain over mainly rural areas of
  northern Union Parish, including the following locations... Marion,
  Cecil, Linville, Haile and Litroe.

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.

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

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

&&

LAT...LON 3277 9257 3292 9259 3301 9213 3301 9207
      3299 9207 3298 9208 3297 9207 3297 9208
      3292 9207 3292 9208 3287 9208 3284 9206
      3282 9207 3279 9206
TIME...MOT...LOC 0833Z 260DEG 42KT 3288 9237 

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

$$

15

1 follow-up statement

408 
WWUS54 KSHV 110912
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
312 AM CST Sat Jan 11 2020

LAC111-110921-
/O.EXP.KSHV.TO.W.0013.000000T0000Z-200111T0915Z/
Union LA-
312 AM CST Sat Jan 11 2020

...THE TORNADO WARNING FOR NORTHERN UNION PARISH WILL EXPIRE AT 315
AM CST...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 600 AM CST for south central
Arkansas. A Tornado Watch also remains in effect until 800 AM CST for
south central Arkansas...and north central Louisiana.

Remember, a Severe Thunderstorm Warning still remains in effect for 
Union County until 315 AM. 

LAT...LON 3277 9257 3292 9259 3301 9213 3301 9207
      3299 9207 3298 9208 3297 9207 3297 9208
      3292 9207 3292 9208 3287 9208 3284 9206
      3282 9207 3279 9206
TIME...MOT...LOC 0911Z 270DEG 42KT 3296 9185 

$$

15

The office that day

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

Issued	Product	Office	Counties	Lasted
Jan 11, 12:34 AM CST	Tornado Warning	SHV	Caddo	41 min
Jan 11, 12:40 AM CST	Severe Thunderstorm Warning	SHV	Bossier, Caddo, De Soto	65 min
Jan 11, 1:00 AM CST	Severe Thunderstorm Warning	SHV	De Soto, Red River, Sabine	45 min
Jan 11, 1:27 AM CST	Tornado Warning	SHV	Bossier, Webster	28 min
Jan 11, 1:30 AM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Claiborne, De Soto, Lincoln, Natchitoches and 3 more	60 min
Jan 11, 1:39 AM CST	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	66 min
Jan 11, 1:48 AM CST	Tornado Warning	SHV	Bienville, Claiborne, Webster	27 min
Jan 11, 2:16 AM CST	Severe Thunderstorm Warning	SHV	Jackson, Lincoln, Ouachita, Union	59 min
Jan 11, 2:42 AM CST	Special Weather Statement	SHV	Natchitoches, Winn	63 min
Jan 11, 3:01 AM CST	Special Weather Statement	SHV	Caldwell, Jackson	59 min
Jan 11, 3:24 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Lincoln, Ouachita, Union, Winn	51 min
Jan 11, 3:43 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle, Winn	62 min
Jan 11, 4:16 AM CST	Special Weather Statement	SHV	Caldwell, Ouachita	29 min
Jan 11, 4:27 AM CST	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	12 hr
Jan 11, 4:42 AM CST	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle	33 min
Jan 11, 5:15 AM CST	River Flood Warning	SHV	Webster	11 days

Nearby

Tornado Warnings in Louisiana, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.