Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

August 17, 2021De Soto Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Aug 17, 2021, 10:43 PM CDT for De Soto Parish, Louisiana. It was in force for 32 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 17, 2021, 10:43 PM CDT (03:43 UTC)
Expired
Aug 17, 2021, 11:15 PM CDT
In force
32 min
Issued by
NWS Shreveport, LA
Hail
0.00 in
Wind
40

County De Soto Parish, LA

The radar

The Shreveport radar (KSHV), 43 km from the middle of the area, began a volume at 03:42 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, 3.7 hours before the alert went out and 42 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 00:00Z on 2021-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1110 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 00:00Z on 2021-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 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
1110 J/kg
Mixed-layer CIN
-28 J/kg
Mixed-layer LCL
1333 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
77 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Shreveport, LA wrote its last area forecast discussion before this special weather statement went out at Aug 17, 10:14 PM CDT, 29 minutes earlier.

Area forecast discussion, Aug 17, 10:14 PM CDT, 29 minutes before
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Hazardous weather outlook, Aug 17, 1:09 PM CDT, 9 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
109 PM CDT Tue Aug 17 2021

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-181815-
Sevier-Howard-Little River-Hempstead-Nevada-Miller-Lafayette-
Columbia-Union-Caddo-Bossier-Webster-Claiborne-Lincoln-De Soto-
Red River-Bienville-Jackson-Ouachita-Sabine-Natchitoches-Winn-
Grant-Caldwell-La Salle-McCurtain-Bowie-Franklin-Titus-Camp-
Morris-Cass-Wood-Upshur-Marion-Smith-Gregg-Harrison-Cherokee-Rusk-
Panola-Nacogdoches-Shelby-Angelina-San Augustine-
109 PM CDT Tue Aug 17 2021

This Hazardous Weather Outlook is for portions of south central
Arkansas, southwest Arkansas, north central Louisiana, northwest
Louisiana, southeast Oklahoma, east Texas and northeast Texas.

.DAY ONE...This Afternoon and Tonight...

Scattered showers and thunderstorms will continue this afternoon
through the early evening hours. Brief gusty winds, frequent
lightning, and pockets of torrential downpours will be possible
with some storms, and the possibility of flash flooding remains a
threat in areas of prolonged heavy rainfall. Storms are generally
not anticipated to be severe.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday...

Scattered to numerous, mainly afternoon, thunderstorms are
expected on Thursday before activity generally decreases Friday
through the weekend. Severe thunderstorms are generally not
anticipated, although some storms could continue to produce
frequent lightning, heavy downpours, and brief gusty winds. Hot
temperatures are expected to return this weekend with heat indices
nearing Heat Advisory criteria late this weekend into early next
week.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters is not anticipated at this time.

26

In the hours before

Special weather statement, Aug 17, 7:14 PM CDT, 3 hours 29 minutes before
Special Weather Statement
National Weather Service Shreveport LA
714 PM CDT Tue Aug 17 2021

TXZ124-136-180045-
Smith TX-Wood TX-
714 PM CDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of northwestern Smith
and southwestern Wood Counties through 745 PM CDT...

At 714 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Grand Saline to near Edom. Movement was
east at 20 mph.

HAZARD...Wind gusts up to 50 mph.

SOURCE...Radar indicated.

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

Locations impacted include...
Mineola, Lindale, Hoard and Carroll.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

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

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 3270 9559 3273 9548 3243 9524 3237 9547
      3239 9550 3242 9551 3248 9559
TIME...MOT...LOC 0014Z 253DEG 19KT 3259 9570 3239 9555

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...50 MPH

24
Special weather statement, Aug 17, 7:58 PM CDT, 2 hours 45 minutes before
Special Weather Statement
National Weather Service Shreveport LA
758 PM CDT Tue Aug 17 2021

TXZ124-180200-
Wood TX-
758 PM CDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of Wood County through
900 PM CDT...

At 757 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from Golden to near Hoard. Movement was 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...
Mineola, Winnsboro, Quitman, Pleasant Grove, Hoard, Hainesville,
Golden, Forest Hill, Yantis and Perryville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3296 9556 3296 9515 3276 9515 3260 9533
      3261 9536 3260 9538 3261 9542 3261 9546
      3270 9560 3270 9561
TIME...MOT...LOC 0057Z 222DEG 17KT 3273 9557 3263 9536

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

24
Special weather statement, Aug 17, 8:02 PM CDT, 2 hours 41 minutes before
Special Weather Statement
National Weather Service Shreveport LA
802 PM CDT Tue Aug 17 2021

LAZ005-012-013-180200-
Bienville LA-Lincoln LA-Jackson LA-
802 PM CDT Tue Aug 17 2021

...Strong thunderstorms will impact portions of northern Jackson,
northeastern Bienville and southern Lincoln Parishes through 900 PM
CDT...

At 802 PM CDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Gibsland to near Jonesboro. Movement was
east 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...
Ruston, Grambling, Arcadia, Choudrant, Simsboro, Hodge, North Hodge,
Vienna, East Hodge, Quitman, Eros, Bryceland and Mount Lebanon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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 3225 9277 3250 9307 3258 9295 3259 9288
      3261 9287 3264 9286 3269 9279 3259 9251
      3239 9240
TIME...MOT...LOC 0102Z 251DEG 19KT 3250 9302 3229 9277

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

24
Special weather statement, Aug 17, 8:09 PM CDT, 2 hours 34 minutes before
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Special weather statement, Aug 17, 9:54 PM CDT, 49 minutes before
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Special weather statement, Aug 17, 10:43 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 17, 7:14 PM CDTSpecial Weather StatementSHVSmith31 min
Aug 17, 7:33 PM CDTSevere Thunderstorm WarningSHVSmith, Wood57 min
Aug 17, 7:58 PM CDTSpecial Weather StatementSHVWood62 min
Aug 17, 8:09 PM CDTSpecial Weather StatementSHVSmith51 min
Aug 18, 3:00 AM CDTAreal Flood AdvisorySHVPanola, Rusk, Shelby3 hr
Aug 18, 4:46 AM CDTAreal Flood AdvisorySHVSmith3 hr
Aug 18, 5:35 AM CDTFlash Flood Warning Considerable damage threatSHVSmith3 hr
Aug 17, 7:11 PM CDTSpecial Weather StatementSHVBienville34 min
Aug 17, 8:02 PM CDTSpecial Weather StatementSHVLincoln58 min
Aug 17, 9:54 PM CDTSpecial Weather StatementSHVBossier51 min
Aug 18, 4:02 PM CDTSpecial Weather StatementSHVWinn28 min
Aug 18, 4:41 PM CDTSpecial Weather StatementSHVWebster34 min
Aug 18, 5:30 PM CDTAreal Flood AdvisorySHVBossier, Caddo, De Soto2 hr
Aug 18, 6:50 PM CDTSpecial Weather StatementSHVOuachita25 min
Aug 18, 6:47 PM CDTSpecial Weather StatementSHVUnion43 min

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.