Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

August 1, 2021Claiborne Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Aug 1, 2021, 10:31 PM CDT for Claiborne Parish, Louisiana. It was in force for 44 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: Aug 1, 2021, 10:31 PM CDT (03:31 UTC)
Expired: Aug 1, 2021, 11:15 PM CDT
In force: 44 min
Issued by: NWS Shreveport, LA

County Claiborne Parish, LA

The radar

The Shreveport radar (KSHV), 76 km from the middle of the area, began a volume at 03:35 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 00:00Z, 3.5 hours before the alert went out and 67 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: 2158 J/kg
Mixed-layer CIN: -2 J/kg
Mixed-layer LCL: 1591 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: 2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

760 
WWUS84 KSHV 020331
SPSSHV

Special Weather Statement
National Weather Service Shreveport LA
1031 PM CDT Sun Aug 1 2021
 
ARZ072-073-LAZ003-004-020415-
Union AR-Columbia AR-Claiborne LA-Webster LA-
1031 PM CDT Sun Aug 1 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN UNION AND
SOUTHEASTERN COLUMBIA COUNTIES...NORTHWESTERN WEBSTER AND
NORTHWESTERN CLAIBORNE PARISHES UNTIL 1115 PM CDT...

At 1031 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Haynesville to near Cotton Valley.
Movement was east at 20 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
these storms.

Locations impacted include...
Homer, Haynesville, Cotton Valley, Shongaloo, Evergreen, Leton and
Couchwood.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

These storms may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 3304 9272 3276 9308 3273 9345 3276 9345
      3277 9347 3278 9347 3306 9321
TIME...MOT...LOC 0331Z 271DEG 16KT 3301 9318 3274 9346 

$$

33

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 1, 7:07 PM CDT	Special Weather Statement	SHV	Cass	53 min
Aug 1, 10:43 PM CDT	Special Weather Statement	SHV	Harrison	47 min
Aug 1, 7:15 PM CDT	Special Weather Statement	SHV	Union	30 min
Aug 1, 8:09 PM CDT	Areal Flood Advisory	SHV	Ouachita, Union	111 min
Aug 1, 8:16 PM CDT	Special Weather Statement	SHV	Union	29 min
Aug 1, 9:09 PM CDT	Special Weather Statement	SHV	Lincoln	36 min
Aug 1, 9:20 PM CDT	Special Weather Statement	SHV	Webster	40 min
Aug 1, 10:02 PM CDT	Special Weather Statement	SHV	Webster	43 min
Aug 2, 4:52 AM CDT	Areal Flood Advisory	SHV	Ouachita	3 hr
Aug 2, 5:53 PM CDT	Flash Flood Warning	SHV	Ouachita	3 hr
Aug 2, 6:38 PM CDT	Areal Flood Advisory	SHV	Claiborne, Lincoln, Union	3 hr
Aug 1, 7:44 PM CDT	Special Weather Statement	SHV	Lafayette	31 min
Aug 1, 8:18 PM CDT	Special Weather Statement	SHV	Lafayette	42 min
Aug 1, 9:38 PM CDT	Special Weather Statement	SHV	Columbia	37 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.