Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Shreveport, LA

April 9, 2021Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 9, 2021, 10:27 PM CDT for Grant Parish, LaSalle Parish, Louisiana. It was in force for 40 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, 10:27 PM CDT (03:27 UTC)
Expired: Apr 9, 2021, 11:07 PM CDT
In force: 40 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Grant Parish, LA, LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 81 km from the middle of the area, began a volume at 03:30 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, 10:50 PM CDT	TSTM WND DMG	7 S Midway, LA	TREE REPORTED DOWN IN NEBO.

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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 3.5 hours before the alert went out and 179 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: 2773 J/kg
Mixed-layer CIN: -94 J/kg
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 111 m²/s²
0-3 km storm-relative helicity: 149 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 7.7

Open this sounding in Storm Lab

The text

As transmitted.

476 
WUUS54 KSHV 100327
SVRSHV
LAC043-059-100430-
/O.NEW.KSHV.SV.W.0084.210410T0327Z-210410T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1027 PM CDT Fri Apr 9 2021

The National Weather Service in Shreveport has issued a

* Severe Thunderstorm Warning for...
  Southeastern Grant Parish in north central Louisiana...
  La Salle Parish in north central Louisiana...

* Until 1130 PM CDT.

* At 1027 PM CDT, a severe thunderstorm was located near Ball, or 12
  miles north of Pineville, 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...
  Ball, Jena, Midway, Pollock, Dry Prong, Nebo, Rogers, Catahoula
  Lake, Fishville and Bentley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3139 9213 3142 9216 3147 9216 3148 9221
      3141 9252 3161 9261 3185 9201 3141 9201
TIME...MOT...LOC 0327Z 246DEG 29KT 3152 9240 

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

19

2 follow-up statements

752 
WWUS54 KSHV 100356
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1056 PM CDT Fri Apr 9 2021

LAC043-100406-
/O.CAN.KSHV.SV.W.0084.000000T0000Z-210410T0430Z/
Grant LA-
1056 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN GRANT 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 100 AM CDT for
north central Louisiana.

LAT...LON 3139 9213 3142 9216 3147 9216 3149 9221
      3148 9224 3151 9225 3149 9228 3153 9227
      3154 9230 3157 9232 3159 9231 3162 9238
      3163 9235 3163 9237 3166 9237 3169 9235
      3170 9237 3185 9201 3141 9201
TIME...MOT...LOC 0356Z 246DEG 29KT 3162 9215 

$$

LAC059-100430-
/O.CON.KSHV.SV.W.0084.000000T0000Z-210410T0430Z/
La Salle LA-
1056 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR LA SALLE PARISH...

At 1056 PM CDT, a severe thunderstorm was located near Midway, or 22
miles northwest of Larto, 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...
Jena, Midway, Nebo, Rogers and Catahoula Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3139 9213 3142 9216 3147 9216 3149 9221
      3148 9224 3151 9225 3149 9228 3153 9227
      3154 9230 3157 9232 3159 9231 3162 9238
      3163 9235 3163 9237 3166 9237 3169 9235
      3170 9237 3185 9201 3141 9201
TIME...MOT...LOC 0356Z 246DEG 29KT 3162 9215 

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

19

447 
WWUS54 KSHV 100407
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
1107 PM CDT Fri Apr 9 2021

LAC059-100416-
/O.CAN.KSHV.SV.W.0084.000000T0000Z-210410T0430Z/
La Salle LA-
1107 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR LA SALLE PARISH IS
CANCELLED...
        
The storm which prompted the warning has weakened below severe 
limits and is exiting the warned area. Therefore, the warning has 
been cancelled.

A Severe Thunderstorm Watch remains in effect until 100 AM CDT for
north central Louisiana.

LAT...LON 3139 9213 3142 9216 3147 9216 3149 9221
      3148 9224 3151 9225 3149 9228 3153 9227
      3154 9230 3157 9232 3159 9231 3162 9238
      3163 9235 3163 9237 3166 9237 3169 9235
      3170 9237 3185 9201 3141 9201
TIME...MOT...LOC 0404Z 246DEG 29KT 3165 9206 

$$

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, 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, 8:43 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, 10:40 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.