Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 82, NWS Shreveport, LA

April 9, 2021Caldwell Parish, Ouachita Parish, Winn Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 8:43 PM CDT for Caldwell Parish, Ouachita Parish, Winn Parish, Louisiana. It was in force for 62 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: Apr 9, 2021, 8:43 PM CDT (01:43 UTC)
Expired: Apr 9, 2021, 9:45 PM CDT
In force: 62 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

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

The radar

The Ft Polk radar (KPOE), 139 km from the middle of the area, began a volume at 01:46 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
Apr 9, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.7 hours before the alert went out and 166 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: 148 J/kg
Mixed-layer CIN: -321 J/kg
Mixed-layer LCL: 2441 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 421 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

627 
WUUS54 KSHV 100143
SVRSHV
LAC021-073-127-100245-
/O.NEW.KSHV.SV.W.0082.210410T0143Z-210410T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
843 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Caldwell Parish in north central Louisiana...
  Southeastern Ouachita Parish in north central Louisiana...
  East central Winn Parish in north central Louisiana...

* Until 945 PM CDT.

* At 843 PM CDT, severe thunderstorms were located along a line
  extending from 16 miles northwest of Columbia to 11 miles east of
  Winnfield, moving east at 45 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...
  Columbia, Clarks, Grayson, Spaulding, Vixen, Bosco, Riverton, Kelly
  and Burlington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3209 9187 3209 9191 3207 9193 3201 9189
      3193 9190 3193 9231 3192 9231 3193 9240
      3214 9231 3228 9231 3237 9201 3228 9203
      3228 9199 3219 9201 3220 9198 3217 9198
      3216 9190 3214 9190 3212 9187
TIME...MOT...LOC 0143Z 287DEG 38KT 3224 9231 3192 9244 

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

50

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:03 PM CDT	Special Weather Statement	SHV	Jackson	42 min
Apr 9, 7:11 PM CDT	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	64 min
Apr 9, 7:18 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita	42 min
Apr 9, 7:30 PM CDT	Special Weather Statement	SHV	Union	45 min
Apr 9, 7:35 PM CDT	Flash Flood Warning	SHV	Caldwell, Jackson, Lincoln, Ouachita, Union, Winn	3 hr
Apr 9, 7:35 PM CDT	Special Weather Statement	SHV	Webster	40 min
Apr 9, 7:35 PM CDT	Special Weather Statement	SHV	De Soto	40 min
Apr 9, 7:40 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Natchitoches, Red River, Winn	42 min
Apr 9, 7:50 PM CDT	Special Weather Statement	SHV	Claiborne, Lincoln	40 min
Apr 9, 7:55 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Grant, Jackson, Natchitoches, Winn	65 min
Apr 9, 7:57 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	22 min
Apr 9, 8:33 PM CDT	Special Weather Statement	SHV	Claiborne, Webster	42 min
Apr 9, 8:36 PM CDT	Special Weather Statement	SHV	De Soto	54 min
Apr 9, 8:50 PM CDT	Special Weather Statement	SHV	Natchitoches	55 min
Apr 9, 9:32 PM CDT	Special Weather Statement	SHV	Grant, LaSalle	58 min
Apr 9, 10:27 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle	40 min
Apr 9, 10:40 PM CDT	Special Weather Statement	SHV	Ouachita, Winn	50 min
Apr 9, 11:42 PM CDT	Severe Thunderstorm Warning	SHV	Caddo	63 min
Apr 10, 12:23 AM CDT	Special Weather Statement	SHV	Bossier, Caddo, Webster	67 min
Apr 10, 12:32 AM CDT	Special Weather Statement	SHV	LaSalle	43 min
Apr 10, 12:41 AM CDT	Special Weather Statement	SHV	Claiborne, Lincoln, Union	49 min
Apr 10, 12:45 AM CDT	Severe Thunderstorm Warning	SHV	LaSalle	45 min
Apr 10, 12:46 AM CDT	Special Weather Statement	SHV	Sabine	29 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.