Alert archive / Louisiana / Tornado Warnings in 2021

Tornado Warning 16, NWS Shreveport, LA

March 30, 2021Union Parish, Louisiana

NWS Shreveport, LA issued this tornado warning at Mar 30, 2021, 8:59 PM CDT for Union Parish, 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 30, 2021, 8:59 PM CDT (01:59 UTC)
Expired: Mar 30, 2021, 9:30 PM CDT
In force: 31 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

County Union Parish, LA

The radar

The Shreveport radar (KSHV), 167 km from the middle of the area, began a volume at 02:00 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 00:00Z, 2.0 hours before the alert went out and 158 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: 1017 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 909 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 169 m²/s²
0-3 km storm-relative helicity: 170 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 7.1

Open this sounding in Storm Lab

The text

As transmitted.

840 
WFUS54 KSHV 310159
TORSHV
LAC111-310230-
/O.NEW.KSHV.TO.W.0016.210331T0159Z-210331T0230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Shreveport LA
859 PM CDT Tue Mar 30 2021

The National Weather Service in Shreveport has issued a

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

* Until 930 PM CDT.
    
* At 859 PM CDT, a tornado producing storm was located 7 miles
  northwest of Sterlington, or 14 miles north of Claiborne, moving
  northeast at 35 mph.

  HAZARD...Damaging tornado.

  SOURCE...Radar confirmed tornado.

  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
  southeastern Union Parish, including the following locations...
  Spencer, Haile and Rocky Branch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3273 9207 3272 9206 3270 9209 3267 9222
      3275 9229 3289 9209 3287 9208 3284 9206
      3283 9207 3279 9205 3276 9206 3274 9205
TIME...MOT...LOC 0159Z 241DEG 29KT 3275 9217 

TORNADO...OBSERVED
HAIL...<.75IN

$$

33

1 follow-up statement

152 
WWUS54 KSHV 310211
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
911 PM CDT Tue Mar 30 2021

LAC111-310230-
/O.CON.KSHV.TO.W.0016.000000T0000Z-210331T0230Z/
Union LA-
911 PM CDT Tue Mar 30 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 930 PM CDT FOR EAST
CENTRAL UNION PARISH...
        
At 911 PM CDT, a confirmed tornado was located 7 miles north of
Sterlington, or 9 miles west of Bastrop, moving northeast at 35 mph.

HAZARD...Damaging tornado.

SOURCE...Radar confirmed tornado.

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...
Spencer and Haile. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 3275 9207 3273 9211 3273 9215 3279 9224
      3289 9209 3287 9208 3284 9206 3283 9207
      3279 9205 3276 9206
TIME...MOT...LOC 0211Z 241DEG 29KT 3280 9207 

TORNADO...OBSERVED
HAIL...<.75IN

$$

33

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 30, 8:36 PM CDT	Special Weather Statement	SHV	Union	39 min
Mar 30, 8:54 PM CDT	Severe Thunderstorm Warning	SHV	Union	36 min
Mar 31, 3:27 AM CDT	Lake Wind Advisory	SHV	Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more	16 hr
Mar 31, 7:16 AM CDT	Special Weather Statement	SHV	Union	59 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.