Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 67, NWS Shreveport, LA

April 9, 20214 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 5:54 PM CDT for 4 parishes in Louisiana. It was in force for 66 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, 5:54 PM CDT (22:54 UTC)
Expired: Apr 9, 2021, 7:00 PM CDT
In force: 66 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
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), 147 km from the middle of the area, began a volume at 22:56 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, 6:10 PM CDT	HAIL 2.75	11 Ese Chatham, LA	PUBLIC POST PICTURE OF BASEBALL SIZE HAIL IN THE VIXEN COMMUNITY VIA KNOE SOCIAL MEDIA PAGE.

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, 12:07 PM CDT	Severe Thunderstorm Watch	SPC	6 hr
Apr 9, 5:32 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 10.9 hours before the alert went out and 164 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: 928 J/kg
Mixed-layer CIN: -310 J/kg
Mixed-layer LCL: 1043 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 61 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

744 
WUUS54 KSHV 092254
SVRSHV
LAC021-049-073-127-100000-
/O.NEW.KSHV.SV.W.0067.210409T2254Z-210410T0000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
554 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...
  Southeastern Jackson Parish in north central Louisiana...
  Southern Ouachita Parish in north central Louisiana...
  Northeastern Winn Parish in north central Louisiana...

* Until 700 PM CDT.

* At 554 PM CDT, a severe thunderstorm was located 14 miles northwest
  of Clarks, or 16 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...
  Columbia, Fondale, Vixen, Bosco, Riverton, Luna and Lapine. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3205 9245 3236 9242 3246 9195 3238 9200
      3228 9203 3227 9199 3226 9200 3225 9199
      3223 9201 3221 9199 3219 9201 3220 9197
      3217 9198 3217 9194 3216 9190 3214 9190
      3212 9188 3212 9187 3210 9187
TIME...MOT...LOC 2254Z 239DEG 32KT 3213 9237 

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

19

2 follow-up statements

335 
WWUS54 KSHV 092332
SVSSHV

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

LAC049-127-092341-
/O.CAN.KSHV.SV.W.0067.000000T0000Z-210410T0000Z/
Jackson LA-Winn LA-
632 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN JACKSON AND
NORTHEASTERN WINN PARISHES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
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 3215 9231 3232 9231 3237 9237 3246 9195
      3238 9200 3228 9203 3227 9199 3226 9200
      3225 9199 3223 9201 3221 9199 3219 9201
      3220 9198 3217 9198 3216 9190 3214 9190
TIME...MOT...LOC 2331Z 239DEG 32KT 3230 9203 

$$

LAC021-073-100000-
/O.CON.KSHV.SV.W.0067.000000T0000Z-210410T0000Z/
Caldwell LA-Ouachita LA-
632 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR NORTHERN CALDWELL AND SOUTHERN OUACHITA PARISHES...

At 631 PM CDT, a severe thunderstorm was located near Buckner, or 14
miles north 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...
Riverton, Fondale, Luna, Vixen, Bosco and Lapine. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3215 9231 3232 9231 3237 9237 3246 9195
      3238 9200 3228 9203 3227 9199 3226 9200
      3225 9199 3223 9201 3221 9199 3219 9201
      3220 9198 3217 9198 3216 9190 3214 9190
TIME...MOT...LOC 2331Z 239DEG 32KT 3230 9203 

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

19

022 
WWUS54 KSHV 092349
SVSSHV

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

LAC021-092359-
/O.CAN.KSHV.SV.W.0067.000000T0000Z-210410T0000Z/
Caldwell LA-
649 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN CALDWELL PARISH IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
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 3238 9200 3228 9203 3228 9210 3226 9211
      3226 9215 3228 9217 3228 9231 3232 9231
      3237 9237 3246 9195
TIME...MOT...LOC 2349Z 239DEG 32KT 3239 9186 

$$

LAC073-100000-
/O.CON.KSHV.SV.W.0067.000000T0000Z-210410T0000Z/
Ouachita LA-
649 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHERN OUACHITA PARISH...

At 649 PM CDT, a severe thunderstorm was located over Alto, or near
Start, 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...
Fondale, Luna, Bosco and Lapine. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3238 9200 3228 9203 3228 9210 3226 9211
      3226 9215 3228 9217 3228 9231 3232 9231
      3237 9237 3246 9195
TIME...MOT...LOC 2349Z 239DEG 32KT 3239 9186 

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

19

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:28 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Claiborne, Webster	32 min
Apr 9, 2:51 PM CDT	Special Weather Statement	SHV	Caddo	39 min
Apr 9, 4:28 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln, Webster	47 min
Apr 9, 5:01 PM CDT	Severe Thunderstorm Warning	SHV	Union	44 min
Apr 9, 5:15 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Ouachita, Union	45 min
Apr 9, 5:38 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	67 min
Apr 9, 5:40 PM CDT	Special Weather Statement	SHV	De Soto	50 min
Apr 9, 5:44 PM CDT	Severe Thunderstorm Warning	SHV	Ouachita, Union	46 min
Apr 9, 5:49 PM CDT	Severe Thunderstorm Warning	SHV	De Soto	56 min
Apr 9, 5:58 PM CDT	Severe Thunderstorm Warning	SHV	Union	21 min
Apr 9, 6:23 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln, Natchitoches, Red River, Winn	52 min
Apr 9, 6:27 PM CDT	Special Weather Statement	SHV	Bienville	48 min
Apr 9, 6:37 PM CDT	Special Weather Statement	SHV	Ouachita	38 min
Apr 9, 6:40 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Lincoln, Union	65 min
Apr 9, 6:49 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Caddo, De Soto, Red River	56 min
Apr 9, 6:55 PM CDT	Severe Thunderstorm Warning	SHV	Ouachita, Union	65 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.