Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 16, NWS Shreveport, LA

February 5, 20204 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Feb 5, 2020, 12:42 PM CST for 4 parishes in 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 counties it named.

The facts

Issued: Feb 5, 2020, 12:42 PM CST (18:42 UTC)
Expired: Feb 5, 2020, 1:14 PM CST
In force: 32 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 132 km from the middle of the area, began a volume at 18:46 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Feb 5, 11:49 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 6.7 hours before the alert went out and 123 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: 4 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 425 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 470 m²/s²
0-3 km storm-relative helicity: 484 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm 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 severe thunderstorm warning went out at Feb 5, 12:36 PM CST, 6 minutes earlier.

Area forecast discussion, Feb 5, 12:36 PM CST, 6 minutes before

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Hazardous weather outlook, Feb 5, 11:30 AM CST, 1 hour 12 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1130 AM CST Wed Feb 5 2020

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-061730-
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-
1130 AM CST Wed Feb 5 2020

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...

Widespread showers and some embedded thunderstorms will continue
today behind a cold front. A few strong to marginally severe
storms with damaging winds will be possible across Northeast and
Central Louisiana as well as South Central Arkansas. Additionally
small hail can be expected in most storms across the region today.

Wintry precipitation is possible Wednesday night into Thursday
morning for portions of the region. However, no accumulations are
expected at this time.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

Rain chances will return on Saturday and again late Sunday through
Tuesday as a series of frontal boundaries and disturbances move
across the region. At this time, no hazardous weather is
expected.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters should not be needed through
tonight.

In the hours before

Special weather statement, Feb 5, 11:20 AM CST, 1 hour 22 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1120 AM CST Wed Feb 5 2020

LAZ019>022-051800-
Caldwell LA-Winn LA-La Salle LA-Grant LA-
1120 AM CST Wed Feb 5 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN GRANT...SOUTHWESTERN
CALDWELL...NORTHWESTERN LA SALLE AND CENTRAL WINN PARISHES UNTIL NOON
CST...

At 1120 AM CST, Doppler radar was tracking a strong thunderstorm 12
miles northeast of Montgomery, or 13 miles south of Winnfield, moving
northeast at 50 mph.

Pea size hail will be possible with this storm.

Locations impacted include...
Winnfield, Olla, Urania, Atlanta, Sikes, Joyce, Lake Iatt and Hudson.

LAT...LON 3194 9220 3161 9266 3173 9287 3215 9259
      3215 9256
TIME...MOT...LOC 1720Z 215DEG 43KT 3173 9270

05

Special weather statement, Feb 5, 11:27 AM CST, 1 hour 15 minutes before

Special Weather Statement
National Weather Service Shreveport LA
1127 AM CST Wed Feb 5 2020

ARZ070>073-LAZ001>004-012-TXZ110>112-125-126-137-138-051815-
Union AR-Lafayette AR-Miller AR-Columbia AR-Bossier LA-Caddo LA-
Webster LA-Bienville LA-Claiborne LA-Gregg TX-Harrison TX-Marion TX-
Morris TX-Upshur TX-Cass TX-Camp TX-
1127 AM CST Wed Feb 5 2020

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN LAFAYETTE...
SOUTHWESTERN UNION...SOUTHERN MILLER AND SOUTHERN COLUMBIA
COUNTIES...WEBSTER...CADDO...CLAIBORNE...NORTH CENTRAL BIENVILLE AND
BOSSIER PARISHES...MARION...EASTERN UPSHUR...CASS...HARRISON...
SOUTHEASTERN MORRIS...SOUTHEASTERN CAMP AND CENTRAL GREGG COUNTIES
UNTIL 1215 PM CST...

At 1127 AM CST, Doppler radar was tracking strong thunderstorms along
a line extending from Liberty City to near Gibsland. Movement was
north at 65 mph.

Pea size hail is expected with these storms.

Locations impacted include...
Shreveport, Longview, Bossier City, Marshall, Minden, White Oak,
Gladewater, Atlanta, Springhill, Homer, Vivian, Hallsville, Haughton,
Greenwood, Blanchard, Daingerfield, Haynesville, Waskom, Jefferson
and Linden.

LAT...LON 3317 9471 3317 9282 3242 9307 3245 9494
TIME...MOT...LOC 1727Z 194DEG 57KT 3247 9493 3247 9309

05

Special weather statement, Feb 5, 11:52 AM CST, 50 minutes before

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Local storm report, Feb 5, 12:07 PM CST, 35 minutes before

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Local storm report, Feb 5, 12:12 PM CST, 30 minutes before

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Local storm report, Feb 5, 12:15 PM CST, 27 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 5, 10:37 AM CST	Special Weather Statement	SHV	Harrison, Panola, Rusk	38 min
Feb 5, 11:27 AM CST	Special Weather Statement	SHV	Cass, Gregg, Harrison, Marion	48 min
Feb 4, 6:29 PM CST	Special Weather Statement	SHV	Caddo	46 min
Feb 5, 11:20 AM CST	Special Weather Statement	SHV	Winn	40 min
Feb 5, 11:37 AM CST	Severe Thunderstorm Warning	SHV	Grant, Natchitoches	34 min
Feb 5, 11:52 AM CST	Special Weather Statement	SHV	Ouachita	38 min
Feb 5, 12:04 PM CST	Severe Thunderstorm Warning	SHV	Claiborne, Union	24 min
Feb 5, 12:06 PM CST	Severe Thunderstorm Warning	SHV	Winn	42 min
Feb 5, 1:30 PM CST	Special Weather Statement	SHV	Caldwell	30 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2020 Every severe thunderstorm warning in 2020

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.