Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

April 7, 2021Claiborne Parish, Webster Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Apr 7, 2021, 3:21 PM CDT for Claiborne Parish, Webster Parish, Louisiana. It was in force for 39 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 7, 2021, 3:21 PM CDT (20:21 UTC)
Expired: Apr 7, 2021, 4:00 PM CDT
In force: 39 min
Issued by: NWS Shreveport, LA

Counties Claiborne Parish, LA, Webster Parish, LA

The radar

The Shreveport radar (KSHV), 63 km from the middle of the area, began a volume at 20:23 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 nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 8.4 hours before the alert went out and 54 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: 532 J/kg
Mixed-layer CIN: -229 J/kg
Mixed-layer LCL: 506 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 267 m²/s²
0-3 km storm-relative helicity: 433 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

As transmitted.

182 
WWUS84 KSHV 072021
SPSSHV

Special Weather Statement
National Weather Service Shreveport LA
321 PM CDT Wed Apr 7 2021
 
LAZ002>004-072100-
Bossier LA-Claiborne LA-Webster LA-
321 PM CDT Wed Apr 7 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL WEBSTER...NORTHWESTERN
CLAIBORNE AND EAST CENTRAL BOSSIER PARISHES UNTIL 400 PM CDT...

At 321 PM CDT, Doppler radar was tracking a strong thunderstorm near
Cotton Valley, or 9 miles northwest of Minden, moving northeast at 30
mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Minden, Homer, Haynesville, Cotton Valley, Evergreen, Leton, Holly
Springs and Couchwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A Tornado Watch remains in effect until 800 PM CDT for southwestern
Arkansas...and northwestern Louisiana.

LAT...LON 3260 9341 3275 9352 3302 9312 3280 9292
TIME...MOT...LOC 2021Z 237DEG 27KT 3272 9339 

$$

05

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 7, 1:22 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, San Augustine, Shelby	38 min
Apr 7, 1:32 PM CDT	Special Weather Statement	SHV	Camp, Upshur	43 min
Apr 7, 2:12 PM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Marion, Upshur	63 min
Apr 7, 2:30 PM CDT	Special Weather Statement	SHV	Cherokee	45 min
Apr 7, 4:02 PM CDT	Special Weather Statement	SHV	Angelina, San Augustine, Shelby	43 min
Apr 7, 4:09 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	51 min
Apr 7, 4:50 PM CDT	Special Weather Statement	SHV	San Augustine	40 min
Apr 7, 4:58 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	62 min
Apr 7, 5:36 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	39 min
Apr 7, 6:25 PM CDT	Areal Flood Advisory	SHV	Angelina, Nacogdoches, Sabine, San Augustine	3 hr
Apr 7, 1:50 PM CDT	Special Weather Statement	SHV	De Soto	40 min
Apr 7, 3:12 PM CDT	Special Weather Statement	SHV	Lincoln, Union	48 min
Apr 7, 3:56 PM CDT	Special Weather Statement	SHV	De Soto	49 min
Apr 7, 4:09 PM CDT	Special Weather Statement	SHV	Claiborne	51 min
Apr 7, 4:20 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Caddo, De Soto, Red River	40 min
Apr 7, 4:31 PM CDT	Tornado Warning	SHV	Bienville, Bossier, Caddo, Claiborne, Webster	19 min
Apr 7, 4:52 PM CDT	Tornado Warning	SHV	Bienville, Red River	25 min
Apr 7, 5:16 PM CDT	Tornado Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Webster	14 min
Apr 7, 6:38 PM CDT	Tornado Warning	SHV	Jackson, Lincoln, Ouachita, Union	52 min

Nearby

Special Weather Statements in Louisiana, 2021 Every special weather statement 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.