Alert archive / Louisiana / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 308, NWS Shreveport, LA

October 21, 2019Grant Parish, LaSalle Parish, Natchitoches Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Oct 21, 2019, 7:31 AM CDT for Grant Parish, LaSalle Parish, Natchitoches Parish, Louisiana. It was in force for 59 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: Oct 21, 2019, 7:31 AM CDT (12:31 UTC)
Expired: Oct 21, 2019, 8:30 AM CDT
In force: 59 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Grant Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA

The radar

The Ft Polk radar (KPOE), 67 km from the middle of the area, began a volume at 12:31 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
Oct 21, 5:30 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 0.5 hours before the alert went out and 249 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: 12 J/kg
Mixed-layer CIN: -546 J/kg
Mixed-layer LCL: 1483 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 241 m²/s²
0-3 km storm-relative helicity: 316 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Oct 21, 6:52 AM CDT, 39 minutes earlier.

Area forecast discussion, Oct 21, 6:52 AM CDT, 39 minutes before

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Hazardous weather outlook, Oct 21, 5:06 AM CDT, 2 hours 25 minutes before

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In the hours before

Special weather statement, Oct 21, 5:30 AM CDT, 2 hours 1 minute before

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Special weather statement, Oct 21, 5:30 AM CDT, 2 hours 1 minute before

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Special weather statement, Oct 21, 6:27 AM CDT, 1 hour 4 minutes before

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Special weather statement, Oct 21, 6:28 AM CDT, 1 hour 3 minutes before

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Local storm report, Oct 21, 6:46 AM CDT, 45 minutes before

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Special weather statement, Oct 21, 7:26 AM CDT, 5 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
Oct 20, 7:13 PM CDT	Tornado Warning	SHV	Panola, Rusk	47 min
Oct 20, 7:56 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Panola	49 min
Oct 20, 8:01 PM CDT	Tornado Warning	SHV	Panola	44 min
Oct 20, 9:08 PM CDT	Severe Thunderstorm Warning	SHV	Cass, Marion	54 min
Oct 20, 10:41 PM CDT	Special Weather Statement	SHV	Red River	49 min
Oct 20, 11:16 PM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	59 min
Oct 20, 11:24 PM CDT	Severe Thunderstorm Warning	SHV	Franklin, Smith, Wood	51 min
Oct 21, 12:01 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Franklin, Morris, Titus, Wood	44 min
Oct 21, 12:03 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Red River	57 min
Oct 21, 12:52 AM CDT	Severe Thunderstorm Warning	SHV	Red River	53 min
Oct 21, 1:35 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Red River, Titus	55 min
Oct 21, 1:45 AM CDT	Severe Thunderstorm Warning	SHV	Red River	60 min
Oct 21, 2:28 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 2 more	62 min
Oct 21, 2:29 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Smith, Upshur, Wood	61 min
Oct 21, 3:11 AM CDT	Tornado Warning	SHV	Cass	34 min
Oct 21, 3:30 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	60 min
Oct 21, 3:37 AM CDT	Special Weather Statement	SHV	Cherokee, Rusk, Smith	53 min
Oct 21, 4:25 AM CDT	Special Weather Statement	SHV	Nacogdoches, Panola, Rusk, Shelby	65 min
Oct 21, 4:49 AM CDT	Severe Thunderstorm Warning	SHV	Panola	41 min
Oct 21, 5:30 AM CDT	Special Weather Statement	SHV	Shelby	60 min
Oct 21, 6:28 AM CDT	Special Weather Statement	SHV	Sabine	62 min
Oct 20, 8:30 PM CDT	Tornado Warning	SHV	Caddo	45 min
Oct 20, 9:06 PM CDT	Tornado Warning	SHV	Bossier, Caddo, Webster	31 min
Oct 21, 4:24 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	66 min
Oct 21, 6:27 AM CDT	Special Weather Statement	SHV	Jackson, Ouachita, Union	63 min
Oct 21, 7:26 AM CDT	Special Weather Statement	SHV	Caldwell, Grant, LaSalle	64 min
Oct 20, 9:56 PM CDT	Special Weather Statement	SHV	Lafayette	49 min
Oct 20, 11:59 PM CDT	Tornado Warning	SHV	Howard, Sevier	27 min
Oct 21, 2:39 AM CDT	Severe Thunderstorm Warning	SHV	Hempstead, Howard, Little River, Miller, Nevada, Sevier	66 min
Oct 21, 4:07 AM CDT	Special Weather Statement	SHV	Nevada	23 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2019 Every severe thunderstorm warning in 2019

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.