Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

August 9, 2021Grant Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Aug 9, 2021, 3:16 PM CDT for Grant 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 9, 2021, 3:16 PM CDT (20:16 UTC)
Expired
Aug 9, 2021, 4:00 PM CDT
In force
44 min
Issued by
NWS Shreveport, LA
Hail
0.00 in
Wind
40

County Grant Parish, LA

The radar

The Ft Polk radar (KPOE), 35 km from the middle of the area, began a volume at 20:18 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, 8.3 hours before the alert went out and 146 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-pSkew-T log-p diagram, Shreveport, LA at 12:00Z on 2021-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1233 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Shreveport, LA at 12:00Z on 2021-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -55 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1233 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
912 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-55 m²/s²
0-3 km storm-relative helicity
-22 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

748 
WWUS84 KSHV 092016
SPSSHV

Special Weather Statement
National Weather Service Shreveport LA
316 PM CDT Mon Aug 9 2021
 
LAZ018-020-092100-
Natchitoches LA-Grant LA-
316 PM CDT Mon Aug 9 2021

...A strong thunderstorm will impact portions of southwestern Grant
and southeastern Natchitoches Parishes through 400 PM CDT...

At 315 PM CDT, Doppler radar was tracking a strong thunderstorm near
Clifton, or 13 miles southwest of Lena, moving northeast at 20 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Colfax, Montgomery, Cloutierville, Melrose, Chopin, Bermuda, Aloha
and Gorum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

&&

LAT...LON 3137 9313 3171 9299 3153 9255 3139 9265
      3141 9267 3140 9270 3142 9268 3143 9269
      3145 9268 3145 9271 3147 9271 3147 9269
      3152 9272 3142 9285 3142 9287 3139 9289
      3139 9291 3137 9292 3137 9295 3135 9295
TIME...MOT...LOC 2015Z 203DEG 19KT 3132 9292 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

$$

19

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 9, 2:55 AM CDTHeat AdvisorySHVAngelina, Bowie, Camp, Cass, Cherokee, Franklin and 15 more16 hr

Nearby

Special Weather Statements in Louisiana, 2021Every 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.