Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 8, NWS Shreveport, LA

March 16, 20214 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 16, 2021, 6:04 PM CDT for 4 parishes in Louisiana. It was in force for 31 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Mar 16, 2021, 6:04 PM CDT (23:04 UTC)
Expired: Mar 16, 2021, 6:35 PM CDT
In force: 31 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 60.0 mph

Counties Caldwell Parish, LA, Jackson Parish, LA, Ouachita Parish, LA, Winn Parish, LA

The radar

The Ft Polk radar (KPOE), 124 km from the middle of the area, began a volume at 23:03 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.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.1 hours before the alert went out and 140 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: 108 J/kg
Mixed-layer CIN: -34 J/kg
Mixed-layer LCL: 639 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 58 m²/s²
0-3 km storm-relative helicity: 127 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

226 
WUUS54 KSHV 162304
SVRSHV
LAC021-049-073-127-162345-
/O.NEW.KSHV.SV.W.0008.210316T2304Z-210316T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
604 PM CDT Tue Mar 16 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northwestern Caldwell Parish in north central Louisiana...
  Southeastern Jackson Parish in north central Louisiana...
  Southwestern Ouachita Parish in north central Louisiana...
  Northeastern Winn Parish in north central Louisiana...

* Until 645 PM CDT.

* At 603 PM CDT, a severe thunderstorm was located 12 miles northwest
  of Olla, or 16 miles northeast of Winnfield, moving northeast at 35
  mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Luna and Vixen. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3194 9234 3200 9250 3240 9233 3231 9209
TIME...MOT...LOC 2303Z 204DEG 29KT 3203 9239 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

19

2 follow-up statements

447 
WWUS54 KSHV 162323
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
623 PM CDT Tue Mar 16 2021

LAC021-049-073-127-162345-
/O.CON.KSHV.SV.W.0008.000000T0000Z-210316T2345Z/
Caldwell LA-Jackson LA-Ouachita LA-Winn LA-
623 PM CDT Tue Mar 16 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHWESTERN CALDWELL...SOUTHEASTERN JACKSON...SOUTH CENTRAL
OUACHITA AND NORTHEASTERN WINN PARISHES...

At 623 PM CDT, a severe thunderstorm was located 14 miles northwest
of Clarks, or 14 miles west of Columbia, moving northeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Luna and Vixen. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3206 9226 3211 9240 3238 9227 3231 9209
TIME...MOT...LOC 2323Z 204DEG 29KT 3218 9231 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...60MPH
 
$$

19

322 
WWUS54 KSHV 162335
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
635 PM CDT Tue Mar 16 2021

LAC021-049-073-127-162344-
/O.CAN.KSHV.SV.W.0008.000000T0000Z-210316T2345Z/
Caldwell LA-Jackson LA-Ouachita LA-Winn LA-
635 PM CDT Tue Mar 16 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN CALDWELL...
SOUTHEASTERN JACKSON...SOUTH CENTRAL OUACHITA AND NORTHEASTERN WINN
PARISHES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has weakened.
Therefore, the warning has been cancelled.

LAT...LON 3206 9226 3211 9240 3238 9227 3231 9209
TIME...MOT...LOC 2333Z 204DEG 29KT 3227 9227 

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 15, 11:51 PM CDT	Special Weather Statement	SHV	Union	24 min
Mar 16, 2:36 AM CDT	Special Weather Statement	SHV	Bienville	39 min
Mar 16, 2:08 PM CDT	Special Weather Statement	SHV	LaSalle	52 min
Mar 16, 4:40 PM CDT	Special Weather Statement	SHV	Grant	50 min
Mar 16, 5:30 PM CDT	Special Weather Statement	SHV	LaSalle	45 min
Mar 16, 5:34 PM CDT	Special Weather Statement	SHV	Winn	41 min
Mar 16, 5:44 PM CDT	Special Weather Statement	SHV	Union	46 min
Mar 16, 6:40 PM CDT	Special Weather Statement	SHV	Union	50 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.