Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 15, NWS Shreveport, LA

March 27, 20214 parishes in Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 27, 2021, 8:46 PM CDT for 4 parishes in Louisiana. It was in force for 19 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 27, 2021, 8:46 PM CDT (01:46 UTC)
Expired: Mar 27, 2021, 9:05 PM CDT
In force: 19 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

Counties Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 34 km from the middle of the area, began a volume at 01:45 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Mar 27, 3:25 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.8 hours before the alert went out and 27 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: 1297 J/kg
Mixed-layer CIN: -41 J/kg
Mixed-layer LCL: 953 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 163 m²/s²
0-3 km storm-relative helicity: 217 m²/s²
Significant tornado parameter: 1.6
Supercell composite: 8.1

Open this sounding in Storm Lab

The text

As transmitted.

182 
WFUS54 KSHV 280146
TORSHV
LAC013-015-017-119-280230-
/O.NEW.KSHV.TO.W.0015.210328T0146Z-210328T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
846 PM CDT Sat Mar 27 2021

The National Weather Service in Shreveport has issued a

* Tornado Warning for...
  Southeastern Webster Parish in northwestern Louisiana...
  Southeastern Caddo Parish in northwestern Louisiana...
  Northwestern Bienville Parish in northwestern Louisiana...
  Southeastern Bossier Parish in northwestern Louisiana...

* Until 930 PM CDT.
    
* At 845 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 13 miles east of Stonewall, or 14 miles south of
  Bossier City, moving east at 40 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...
  Shreveport, Bossier City, Ringgold, Sibley, Doyline, Dubberly,
  Heflin, Jamestown, Curtis, Caspiana, Lake Bistineau South,
  Taylortown, Elm Grove, Plum Orchard Landing, Koran, Sailes, Noles
  Landing, Lake Bistineau North, Robson and Mc Dade.

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 3225 9362 3227 9361 3231 9366 3242 9371
      3260 9319 3238 9308
TIME...MOT...LOC 0145Z 247DEG 36KT 3232 9360 

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

$$

19

1 follow-up statement

201 
WWUS54 KSHV 280205
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
905 PM CDT Sat Mar 27 2021

LAC013-015-017-119-280215-
/O.CAN.KSHV.TO.W.0015.000000T0000Z-210328T0230Z/
Webster LA-Caddo LA-Bienville LA-Bossier LA-
905 PM CDT Sat Mar 27 2021

...THE TORNADO WARNING FOR SOUTHEASTERN WEBSTER...SOUTHEASTERN
CADDO...NORTHWESTERN BIENVILLE AND SOUTHEASTERN BOSSIER PARISHES IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe 
limits. Therefore, the warning has been cancelled.  However gusty 
winds are still possible with this thunderstorm.

A Tornado Watch remains in effect until 1100 PM CDT for northwestern
Louisiana.

LAT...LON 3225 9362 3227 9361 3231 9366 3242 9371
      3260 9319 3238 9308
TIME...MOT...LOC 0203Z 247DEG 36KT 3240 9338 

$$

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 27, 7:39 PM CDT	Tornado Warning Tornado observedConsiderable damage threat	SHV	Caddo, De Soto	51 min
Mar 27, 8:04 PM CDT	Tornado Warning	SHV	Bossier, Caddo	41 min
Mar 27, 8:11 PM CDT	Tornado Warning	SHV	Caddo, De Soto	49 min
Mar 27, 10:23 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Union	67 min
Mar 27, 10:39 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo	51 min
Mar 27, 11:30 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Claiborne, Webster	45 min

Nearby

Tornado Warnings in Louisiana, 2021 Every tornado warning in 2021 Tornadoes 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.