Alert archive / Louisiana / Red Flag Warnings in 2023

Red Flag Warning 1, NWS Shreveport, LA

August 20, 202311 counties in Texas; 17 parishes in Louisiana

NWS Shreveport, LA issued this red flag warning at Aug 20, 2023, 1:46 PM CDT for 11 counties in Texas; 17 parishes in Louisiana. It took effect at Aug 21, 2023, 7:00 AM CDT. It was in force for 7 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 2023, 1:46 PM CDT (18:46 UTC)
In effect from
Aug 21, 2023, 7:00 AM CDT
Expired
Aug 27, 2023, 8:00 PM CDT
In force
7 days
Issued by
NWS Shreveport, LA
All 28 counties

Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Cherokee County, TX, Gregg County, TX, Harrison County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX

The radar

The Shreveport radar (KSHV), 46 km from the middle of the area, began a volume at 18:49 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 6.8 hours before the alert went out and 224 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, Lake Charles Mun, LA at 12:00Z on 2023-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1251 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, Lake Charles Mun, LA at 12:00Z on 2023-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 9 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
1251 J/kg
Mixed-layer CIN
-284 J/kg
Mixed-layer LCL
1655 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
9 m²/s²
0-3 km storm-relative helicity
112 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.7

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this red flag warning 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 red flag warning went out at Aug 20, 12:31 PM CDT, 1 hour 15 minutes earlier.

Area forecast discussion, Aug 20, 12:31 PM CDT, 1 hour 15 minutes before
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Hazardous weather outlook, Aug 20, 5:00 AM CDT, 8 hours 46 minutes before
Hazardous Weather Outlook
National Weather Service Shreveport LA
500 AM CDT Sun Aug 20 2023

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-211000-
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-
500 AM CDT Sun Aug 20 2023

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 9 PM CDT MONDAY...

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

.DAY ONE...Today and tonight.

An elevated fire danger threat will persist today across much of the
region due to low relative humidity and critically to extremely dry
conditions. Very hot temperatures well into the triple digits will
also combine with the humidity to maintain Excessive Heat Warnings
across the entire region as heat indices exceed 110 degrees during
peak heating hours.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

Excessive heat hazards are expected to continue through next week as
triple-digit temperatures show no signs of relenting. Increasingly
dry conditions will maintain a risk of wildfires across the region,
with extended periods of increased fire weather messaging likely as
well.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

19

Nearby

Red Flag Warnings in Louisiana, 2023Red Flag Warnings in Texas, 2023Every red flag warning in 2023

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.