Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 80, NWS Shreveport, LA

April 9, 2021Caldwell Parish, Ouachita Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 7:57 PM CDT for Caldwell Parish, Ouachita Parish, Louisiana. It was in force for 22 min. 1 report 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: Apr 9, 2021, 7:57 PM CDT (00:57 UTC)
Expired: Apr 9, 2021, 8:19 PM CDT
In force: 22 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

The radar

The Ft Polk radar (KPOE), 159 km from the middle of the area, began a volume at 01:00 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.

What was reported inside it

Time	Report	Where	Remark
Apr 9, 8:22 PM CDT	TSTM WND DMG	West Monroe, LA	TREE REPORTED DOWN WITH POWER LINES IN WEST MONROE.

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
Apr 9, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 1.0 hours before the alert went out and 165 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.

231 
WUUS54 KSHV 100057
SVRSHV
LAC021-073-100145-
/O.NEW.KSHV.SV.W.0080.210410T0057Z-210410T0145Z/

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

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Northern Caldwell Parish in north central Louisiana...
  Ouachita Parish in north central Louisiana...

* Until 845 PM CDT.

* At 757 PM CDT, a severe thunderstorm was located 7 miles south of
  Richwood, or 10 miles south of Brownsville-Bawcom, moving northeast
  at 40 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...
  Monroe, Claiborne, West Monroe, Swartz, Brownsville-Bawcom,
  Brownsville-Bawcomville, Richwood, Drew, Fondale, Vixen, Bosco,
  Riverton, Millhaven, Cheniere, Pine Grove, Luna and Lapine.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3216 9189 3215 9231 3255 9231 3263 9192
      3260 9193 3252 9190 3249 9194 3245 9194
      3240 9200 3228 9203 3227 9199 3226 9200
      3225 9199 3223 9201 3221 9199 3219 9201
      3220 9198 3217 9198
TIME...MOT...LOC 0057Z 241DEG 34KT 3234 9212 

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

19

1 follow-up statement

016 
WWUS54 KSHV 100119
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
819 PM CDT Fri Apr 9 2021

LAC021-073-100127-
/O.CAN.KSHV.SV.W.0080.000000T0000Z-210410T0145Z/
Caldwell LA-Ouachita LA-
819 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CALDWELL AND OUACHITA
PARISHES IS CANCELLED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been cancelled.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
north central Louisiana.

LAT...LON 3216 9189 3215 9231 3255 9231 3263 9192
      3260 9193 3252 9190 3249 9194 3245 9194
      3240 9200 3228 9203 3227 9199 3226 9200
      3225 9199 3223 9201 3221 9199 3219 9201
      3220 9198 3217 9198
TIME...MOT...LOC 0115Z 241DEG 34KT 3243 9192 

$$

19

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, 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, 8:43 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita, Winn	62 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.