Alert archive / Texas / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 111, NWS Shreveport, LA

April 6, 20185 counties in Texas

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 6, 2018, 11:00 PM CDT for 5 counties in Texas. It was in force for 60 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 6, 2018, 11:00 PM CDT (04:00 UTC)
Expired: Apr 7, 2018, 12:00 AM CDT
In force: 60 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Angelina County, TX, Cherokee County, TX, Nacogdoches County, TX, Sabine County, TX, San Augustine County, TX

The radar

The Shreveport radar (KSHV), 123 km from the middle of the area, began a volume at 04:00 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 6, 3:20 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.0 hours before the alert went out and 195 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: 1528 J/kg
Mixed-layer CIN: -4 J/kg
Mixed-layer LCL: 633 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 215 m²/s²
Significant tornado parameter: 1.8
Supercell composite: 11.9

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 6, 10:14 PM CDT, 46 minutes earlier.

Area forecast discussion, Apr 6, 10:14 PM CDT, 46 minutes before

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Hazardous weather outlook, Apr 6, 12:03 PM CDT, 10 hours 57 minutes before

Hazardous Weather Outlook
National Weather Service Shreveport LA
1203 PM CDT Fri Apr 6 2018

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-071715-
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-
1203 PM CDT Fri Apr 6 2018

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...

Thunderstorms will gradually become more widespread and increase
in intensity across our northern areas early this afternoon, with
a few damaging wind gusts possible. The threat for severe storms
will increase significantly as we move into the mid to late
afternoon and evening hours, as a cold front brings these storms
southward across the entire region. Damaging winds and large hail
will be the primary threats, but a few tornadoes and even some
localized flooding cannot be ruled out. The threat for severe
storms will gradually diminish during the overnight hours, as the
cold front moves away from our area.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday...

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Activation of emergency management personnel...amateur radio
operators...and storm spotters will likely be needed by late this
afternoon through this evening.

19

In the hours before

Local storm report, Apr 6, 9:59 PM CDT, 1 hour 1 minute before

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Local storm report, Apr 6, 10:15 PM CDT, 45 minutes before

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Local storm report, Apr 6, 10:18 PM CDT, 42 minutes before

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Local storm report, Apr 6, 10:42 PM CDT, 18 minutes before

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Local storm report, Apr 6, 10:47 PM CDT, 13 minutes before

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Local storm report, Apr 6, 10:50 PM CDT, 10 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 6, 7:17 PM CDT	Special Weather Statement	SHV	Panola	43 min
Apr 6, 7:24 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	36 min
Apr 6, 7:44 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	46 min
Apr 6, 7:59 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	33 min
Apr 6, 8:02 PM CDT	Special Weather Statement	SHV	Rusk	43 min
Apr 6, 8:08 PM CDT	Tornado Warning	SHV	Panola, Shelby	10 min
Apr 6, 8:21 PM CDT	Severe Thunderstorm Warning	SHV	Sabine, San Augustine, Shelby	54 min
Apr 6, 8:31 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Rusk, Shelby	44 min
Apr 6, 8:32 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Upshur, Wood	43 min
Apr 6, 8:34 PM CDT	Special Weather Statement	SHV	Rusk	41 min
Apr 6, 8:44 PM CDT	Tornado Warning	SHV	San Augustine, Shelby	19 min
Apr 6, 9:12 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Panola, Rusk, Sabine, San Augustine and 1 more	48 min
Apr 6, 9:17 PM CDT	Special Weather Statement	SHV	Cherokee, Rusk, Smith	43 min
Apr 6, 9:56 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Panola, Rusk, Sabine, San Augustine and 1 more	64 min
Apr 6, 9:58 PM CDT	Special Weather Statement	SHV	Cherokee	77 min
Apr 6, 11:53 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches, Sabine, San Augustine	52 min
Apr 7, 3:40 AM CDT	Freeze Warning	SHV	Bowie, Cass, Red River	28 hr
Apr 7, 9:08 AM CDT	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	8 days
Apr 7, 11:34 AM CDT	Special Weather Statement	SHV	Panola, Rusk	26 min
Apr 6, 7:05 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Lincoln	40 min
Apr 6, 7:09 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Ouachita	36 min
Apr 6, 7:10 PM CDT	Tornado Warning Emergency	SHV	De Soto, Red River	50 min
Apr 6, 7:19 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Winn	56 min
Apr 6, 7:25 PM CDT	Tornado Warning	SHV	Bienville, Red River	8 min
Apr 6, 7:29 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Ouachita, Winn	46 min
Apr 6, 7:30 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, De Soto, Natchitoches, Red River and 1 more	60 min
Apr 6, 7:41 PM CDT	Tornado Warning	SHV	Bienville, Natchitoches, Winn	35 min
Apr 6, 7:43 PM CDT	Tornado Warning	SHV	Caldwell, Jackson, Ouachita	47 min
Apr 6, 7:57 PM CDT	Tornado Warning	SHV	Natchitoches, Red River	10 min
Apr 6, 7:59 PM CDT	Severe Thunderstorm Warning	SHV	Grant, Natchitoches, Red River, Winn	61 min
Apr 6, 8:13 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, LaSalle, Winn	62 min
Apr 6, 8:13 PM CDT	Tornado Warning	SHV	De Soto, Natchitoches, Red River	11 min
Apr 6, 8:18 PM CDT	Tornado Warning	SHV	Natchitoches, Red River	11 min
Apr 6, 8:56 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches, Sabine, Winn	64 min
Apr 6, 9:17 PM CDT	Tornado Warning	SHV	Grant, Natchitoches	16 min
Apr 6, 9:55 PM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches, Sabine	50 min
Apr 6, 11:42 PM CDT	Special Weather Statement	SHV	Sabine	63 min
Apr 7, 12:40 AM CDT	Special Weather Statement	SHV	Natchitoches	65 min

Nearby

Severe Thunderstorm Warnings in Texas, 2018 Every severe thunderstorm warning in 2018

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.