Alert archive / Louisiana / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 89, NWS Shreveport, LA

April 19, 2020Grant Parish, Natchitoches Parish, Sabine Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 19, 2020, 4:34 PM CDT for Grant Parish, Natchitoches Parish, Sabine Parish, Louisiana. It was in force for 56 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: Apr 19, 2020, 4:34 PM CDT (21:34 UTC)
Expired: Apr 19, 2020, 5:30 PM CDT
In force: 56 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grant Parish, LA, Natchitoches Parish, LA, Sabine Parish, LA

The radar

The Ft Polk radar (KPOE), 53 km from the middle of the area, began a volume at 21:38 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
Apr 19, 2:39 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 9.6 hours before the alert went out and 114 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: 561 J/kg
Mixed-layer CIN: -198 J/kg
Mixed-layer LCL: 551 m above ground
0-6 km bulk shear: 51 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.0

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 Apr 19, 3:46 PM CDT, 48 minutes earlier.

Area forecast discussion, Apr 19, 3:46 PM CDT, 48 minutes before

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Hazardous weather outlook, Apr 19, 3:54 AM CDT, 12 hours 40 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
354 AM CDT Sun Apr 19 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>167-201200-
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-
354 AM CDT Sun Apr 19 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...Today and Tonight...

Another widespread severe weather outbreak is likely today through
this evening across much of the Four State Region. Very large
hail, destructive wind gusts and isolated tornadoes, some long
tracked and significant, will be possible. The greatest tornado
threat should be across Deep East Texas into all of Northern and
Northeast Louisiana, late this morning through the afternoon
hours. Another severe weather threat may materialize this evening
into the early overnight hours near and north of the Interstate 20
Corridor of Northeast Texas and Northern Louisiana. The threat
with this secondary severe weather possibility would be large hail
and damaging wind gusts. While very heavy downpours will be
possible today, flash flooding should stay confined to flood prone
areas with widespread flooding not likely through tonight.

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

Another round of severe weather will be possible late Wednesday
through Wednesday Night across the Four State Region. While
details are still far from certain at this time, this mid week
system is concerning for a large portion of our region with an
excessive heavy rainfall threat as well.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will be necessary for today into
this evening. Please relay any information about observed severe
weather to the NWS while following all local, state, and CDC
guidelines.

13

In the hours before

Local storm report, Apr 19, 3:44 PM CDT, 50 minutes before

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Local storm report, Apr 19, 3:53 PM CDT, 41 minutes before

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Special weather statement, Apr 19, 3:56 PM CDT, 38 minutes before

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Special weather statement, Apr 19, 4:11 PM CDT, 23 minutes before

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Special weather statement, Apr 19, 4:15 PM CDT, 19 minutes before

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Special weather statement, Apr 19, 4:27 PM CDT, 7 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
Apr 18, 7:28 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	47 min
Apr 18, 8:05 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	25 min
Apr 18, 8:09 PM CDT	Special Weather Statement	SHV	Camp, Franklin, Titus	51 min
Apr 18, 8:12 PM CDT	Special Weather Statement	SHV	Nacogdoches	48 min
Apr 18, 8:21 PM CDT	Special Weather Statement	SHV	Panola	39 min
Apr 18, 8:49 PM CDT	Special Weather Statement	SHV	Bowie, Morris	41 min
Apr 18, 9:27 PM CDT	Special Weather Statement	SHV	Cass	63 min
Apr 19, 8:57 AM CDT	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	23 days
Apr 19, 8:59 AM CDT	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	17 days
Apr 19, 9:04 AM CDT	River Flood Warning	SHV	Angelina, Houston, Polk, Trinity, Tyler	17 days
Apr 19, 10:13 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Nacogdoches, Rusk	62 min
Apr 19, 10:23 AM CDT	Special Weather Statement	SHV	Shelby	52 min
Apr 19, 10:27 AM CDT	Special Weather Statement	SHV	Panola	48 min
Apr 19, 10:33 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, San Augustine, Shelby	42 min
Apr 19, 10:47 AM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola, Shelby	43 min
Apr 19, 11:12 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, Shelby	48 min
Apr 19, 11:46 AM CDT	Special Weather Statement	SHV	Camp, Titus	44 min
Apr 19, 11:48 AM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Sabine, San Augustine, Shelby	57 min
Apr 19, 11:49 AM CDT	Special Weather Statement	SHV	Rusk	41 min
Apr 19, 12:08 PM CDT	Severe Thunderstorm Warning	SHV	Shelby	67 min
Apr 19, 12:34 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, Shelby	41 min
Apr 19, 12:35 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	36 min
Apr 19, 1:13 PM CDT	Special Weather Statement	SHV	Upshur	62 min
Apr 19, 1:43 PM CDT	Special Weather Statement	SHV	Sabine	47 min
Apr 19, 2:12 PM CDT	Severe Thunderstorm Warning	SHV	Shelby	48 min
Apr 19, 2:43 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Sabine, San Augustine, Shelby	50 min
Apr 19, 2:49 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	41 min
Apr 19, 3:22 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, San Augustine	53 min
Apr 19, 3:56 PM CDT	Special Weather Statement	SHV	Red River	49 min
Apr 19, 4:00 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	45 min
Apr 19, 4:09 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	35 min
Apr 18, 9:13 PM CDT	Special Weather Statement	SHV	Bossier, Caddo	62 min
Apr 18, 9:59 PM CDT	Special Weather Statement	SHV	Bossier, Claiborne, Webster	46 min
Apr 19, 10:17 AM CDT	Special Weather Statement	SHV	Sabine	43 min
Apr 19, 11:06 AM CDT	Special Weather Statement	SHV	Grant, Winn	39 min
Apr 19, 11:06 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Red River, Webster	39 min
Apr 19, 11:24 AM CDT	Special Weather Statement	SHV	Ouachita	51 min
Apr 19, 11:40 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Winn	65 min
Apr 19, 1:01 PM CDT	Flash Flood Warning	SHV	Ouachita	5 hr
Apr 19, 1:06 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Sabine, Winn	54 min
Apr 19, 1:09 PM CDT	Special Weather Statement	SHV	De Soto	51 min
Apr 19, 1:19 PM CDT	Tornado Warning	SHV	Grant, Natchitoches, Winn	41 min
Apr 19, 1:39 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, LaSalle, Winn	52 min
Apr 19, 1:51 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Winn	54 min
Apr 19, 1:56 PM CDT	Tornado Warning	SHV	Grant, LaSalle, Winn	39 min
Apr 19, 2:36 PM CDT	Special Weather Statement	SHV	Sabine	39 min
Apr 19, 2:47 PM CDT	Special Weather Statement	SHV	Bienville	43 min
Apr 19, 4:15 PM CDT	Special Weather Statement	SHV	Natchitoches, Winn	60 min
Apr 19, 5:08 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle, Winn	52 min
Apr 18, 9:28 PM CDT	Special Weather Statement	SHV	Hempstead, Howard, Little River	62 min
Apr 18, 10:03 PM CDT	Special Weather Statement	SHV	Howard	42 min
Apr 18, 11:03 PM CDT	Special Weather Statement	SHV	Union	42 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.