Alert archive / Louisiana / Special Weather Statements in 2021

Special Weather Statement, NWS Shreveport, LA

August 19, 2021Bossier Parish, Louisiana

NWS Shreveport, LA issued this special weather statement at Aug 19, 2021, 1:29 PM CDT for Bossier Parish, Louisiana. It was in force for 46 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 19, 2021, 1:29 PM CDT (18:29 UTC)
Expired
Aug 19, 2021, 2:15 PM CDT
In force
46 min
Issued by
NWS Shreveport, LA
Hail
0.00 in
Wind
40

County Bossier Parish, LA

The radar

The Shreveport radar (KSHV), 26 km from the middle of the area, began a volume at 18:29 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, 6.5 hours before the alert went out and 17 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 2021-08-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1122 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 2021-08-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 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
1122 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
9 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
40 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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 19, 12:32 PM CDT, 57 minutes earlier.

Area forecast discussion, Aug 19, 12:32 PM CDT, 57 minutes before
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Hazardous weather outlook, Aug 19, 3:17 AM CDT, 10 hours 12 minutes before
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In the hours before

Special weather statement, Aug 19, 12:31 PM CDT, 58 minutes before
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Special weather statement, Aug 19, 12:35 PM CDT, 54 minutes before
Special Weather Statement
National Weather Service Shreveport LA
1235 PM CDT Thu Aug 19 2021

TXZ126-138-191815-
Harrison TX-Marion TX-
1235 PM CDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of central Marion and
northern Harrison Counties through 115 PM CDT...

At 1235 PM CDT, Doppler radar was tracking a strong thunderstorm over
Harleton, or 15 miles northeast of Longview, moving northeast at 25
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...
Jefferson, Berea, Harleton, Lodi, Woodlawn, Uncertain, Lassater,
Nesbitt and Pruett.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3288 9445 3288 9424 3270 9413 3254 9457
      3270 9470
TIME...MOT...LOC 1735Z 234DEG 23KT 3267 9457

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

50
Special weather statement, Aug 19, 1:26 PM CDT, 3 minutes before
Special Weather Statement
National Weather Service Shreveport LA
126 PM CDT Thu Aug 19 2021

LAZ001-002-191900-
Bossier LA-Caddo LA-
126 PM CDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of northwestern Caddo
and northwestern Bossier Parishes through 200 PM CDT...

At 126 PM CDT, Doppler radar was tracking a strong thunderstorm over
Belcher, or 18 miles north of Shreveport, moving northeast at 25 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Vivian, Plain Dealing, Oil City, Mooringsport, Hosston, Belcher, Ida,
Gilliam, Dixie, Alden Bridge, Caddo Lake, Cavett and Bolinger.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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.

&&

LAT...LON 3302 9392 3302 9377 3294 9354 3261 9383
      3269 9405 3273 9405
TIME...MOT...LOC 1826Z 210DEG 20KT 3273 9388

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

50
Special weather statement, Aug 19, 1:29 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service Shreveport LA
129 PM CDT Thu Aug 19 2021

LAZ002-003-191915-
Bossier LA-Webster LA-
129 PM CDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of southwestern Webster
and central Bossier Parishes through 215 PM CDT...

At 129 PM CDT, Doppler radar was tracking a strong thunderstorm near
Eastwood, or near Bossier City, moving northeast at 25 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...
Bossier City, Minden, Haughton, Doyline, Dixie Inn, Eastwood,
Fosters, Princeton, Fillmore, Bodcau, Bellevue, Barksdale Air Force
Base, Gilark, Sligo and Red Chute.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 3238 9352 3246 9367 3246 9370 3247 9369
      3249 9370 3277 9353 3262 9326
TIME...MOT...LOC 1829Z 210DEG 20KT 3250 9357

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

50

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 19, 6:51 AM CDTAreal Flood AdvisorySHVRed River3 hr
Aug 19, 7:01 AM CDTAreal Flood AdvisorySHVBowie, Morris, Titus3 hr
Aug 19, 12:35 PM CDTSpecial Weather StatementSHVMarion40 min
Aug 19, 1:31 PM CDTSpecial Weather StatementSHVCass, Morris44 min
Aug 19, 12:31 PM CDTSpecial Weather StatementSHVCaddo44 min
Aug 19, 1:26 PM CDTSpecial Weather StatementSHVBossier34 min
Aug 19, 2:06 PM CDTSpecial Weather StatementSHVRed River24 min
Aug 19, 3:29 PM CDTSpecial Weather StatementSHVOuachita, Union46 min
Aug 19, 2:24 PM CDTSpecial Weather StatementSHVColumbia36 min
Aug 19, 3:24 PM CDTSpecial Weather StatementSHVHempstead, Little River, Sevier36 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.