Alert archive / Louisiana / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 91, NWS Shreveport, LA

April 10, 2021LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 10, 2021, 12:45 AM CDT for LaSalle Parish, Louisiana. It was in force for 45 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 10, 2021, 12:45 AM CDT (05:45 UTC)
Expired: Apr 10, 2021, 1:30 AM CDT
In force: 45 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County LaSalle Parish, LA

The radar

The Ft Polk radar (KPOE), 83 km from the middle of the area, began a volume at 05:45 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, 5.8 hours before the alert went out and 178 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.

141 
WUUS54 KSHV 100545
SVRSHV
LAC059-100630-
/O.NEW.KSHV.SV.W.0091.210410T0545Z-210410T0630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Shreveport LA
1245 AM CDT Sat Apr 10 2021

The National Weather Service in Shreveport has issued a

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

* Until 130 AM CDT.

* At 1244 AM CDT, severe thunderstorms were located along a line
  extending from near Midway to 7 miles west of Walters to Holloway,
  moving northeast at 30 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 3140 9214 3147 9216 3147 9219 3149 9221
      3148 9223 3148 9224 3150 9224 3151 9225
      3150 9226 3154 9228 3154 9230 3155 9229
      3157 9232 3159 9231 3160 9234 3165 9237
      3192 9201 3147 9201
TIME...MOT...LOC 0544Z 226DEG 26KT 3167 9225 3155 9212 3142 9223 

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

15

1 follow-up statement

965 
WWUS54 KSHV 100618
SVSSHV

Severe Weather Statement
National Weather Service Shreveport LA
118 AM CDT Sat Apr 10 2021

LAC059-100630-
/O.CON.KSHV.SV.W.0091.000000T0000Z-210410T0630Z/
La Salle LA-
118 AM CDT Sat Apr 10 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 130 AM CDT
FOR EASTERN LA SALLE PARISH...

At 118 AM CDT, severe thunderstorms were located along a line
extending from near Rosefield to near Manifest to near Walters,
moving east at 25 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Jena, Nebo and Catahoula Lake. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3149 9221 3167 9213 3177 9215 3192 9201
      3147 9201 3140 9214 3147 9216 3147 9219
TIME...MOT...LOC 0618Z 256DEG 24KT 3186 9201 3168 9198 3152 9205 

HAIL...1.25IN
WIND...60MPH
 
$$

15

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, 10:27 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, 12:46 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.