Alert archive / Louisiana / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 76, NWS Shreveport, LA

March 17, 2023Grant Parish, LaSalle Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 17, 2023, 1:38 AM CDT for Grant Parish, LaSalle Parish, Louisiana. It was in force for 46 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: Mar 17, 2023, 1:38 AM CDT (06:38 UTC)
Expired: Mar 17, 2023, 2:24 AM CDT
In force: 46 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

The radar

The Ft Polk radar (KPOE), 79 km from the middle of the area, began a volume at 06:40 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
Mar 16, 10:35 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 6.6 hours before the alert went out and 161 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: 41 J/kg
Mixed-layer CIN: -91 J/kg
Mixed-layer LCL: 602 m above ground
0-6 km bulk shear: 70 kt
0-1 km storm-relative helicity: 441 m²/s²
0-3 km storm-relative helicity: 591 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

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 Mar 17, 12:55 AM CDT, 43 minutes earlier.

Area forecast discussion, Mar 17, 12:55 AM CDT, 43 minutes before

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Hazardous weather outlook, Mar 17, 12:19 AM CDT, 1 hour 19 minutes before

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In the hours before

Special weather statement, Mar 16, 11:48 PM CDT, 1 hour 50 minutes before

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Special weather statement, Mar 16, 11:50 PM CDT, 1 hour 48 minutes before

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Special weather statement, Mar 17, 12:22 AM CDT, 1 hour 16 minutes before

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Special weather statement, Mar 17, 12:33 AM CDT, 1 hour 5 minutes before

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Special weather statement, Mar 17, 12:48 AM CDT, 50 minutes before

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Special weather statement, Mar 17, 1:24 AM CDT, 14 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
Mar 16, 7:10 PM CDT	Severe Thunderstorm Warning	SHV	Smith, Wood	50 min
Mar 16, 7:29 PM CDT	Severe Thunderstorm Warning	SHV	Sabine	46 min
Mar 16, 7:55 PM CDT	Special Weather Statement	SHV	Red River	65 min
Mar 16, 7:58 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Smith, Upshur, Wood	47 min
Mar 16, 8:34 PM CDT	River Flood Warning	SHV	Angelina, Houston, Polk, Trinity, Tyler	5 days
Mar 16, 8:34 PM CDT	Severe Thunderstorm Warning	SHV	Smith	56 min
Mar 16, 8:35 PM CDT	River Flood Warning	SHV	Nacogdoches, Rusk, San Augustine, Shelby	4 days
Mar 16, 8:36 PM CDT	River Flood Warning	SHV	Gregg	24 hr
Mar 16, 8:46 PM CDT	Tornado Warning	SHV	Smith	29 min
Mar 16, 9:22 PM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Gregg, Harrison, Rusk, Smith	53 min
Mar 16, 9:31 PM CDT	Tornado Warning	SHV	Cherokee, Rusk, Smith	29 min
Mar 16, 9:53 PM CDT	Tornado Warning	SHV	Panola, Rusk, Shelby	37 min
Mar 16, 10:03 PM CDT	Severe Thunderstorm Warning	SHV	Harrison, Marion	42 min
Mar 16, 10:29 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, Rusk, Shelby	46 min
Mar 16, 11:07 PM CDT	Severe Thunderstorm Warning	SHV	Nacogdoches, Panola, San Augustine, Shelby	38 min
Mar 16, 11:17 PM CDT	Special Weather Statement	SHV	Angelina	28 min
Mar 16, 11:50 PM CDT	Special Weather Statement	SHV	Angelina, San Augustine	40 min
Mar 17, 12:22 AM CDT	Special Weather Statement	SHV	Sabine	38 min
Mar 17, 12:48 AM CDT	Special Weather Statement	SHV	Sabine	27 min
Mar 17, 2:22 PM CDT	Freeze Watch	SHV	Bowie, Camp, Cass, Cherokee, Franklin, Gregg and 14 more	13 hr
Mar 16, 7:08 PM CDT	Special Weather Statement	SHV	Sabine	52 min
Mar 16, 7:16 PM CDT	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	33 min
Mar 16, 8:13 PM CDT	Special Weather Statement	SHV	Natchitoches	47 min
Mar 16, 9:12 PM CDT	Special Weather Statement	SHV	De Soto	63 min
Mar 16, 10:16 PM CDT	Special Weather Statement	SHV	Bienville, Lincoln	29 min
Mar 16, 10:17 PM CDT	Special Weather Statement	SHV	Red River	58 min
Mar 16, 10:30 PM CDT	Special Weather Statement	SHV	Bossier, Webster	30 min
Mar 16, 10:41 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Jackson, Natchitoches, Red River, Winn	35 min
Mar 16, 11:09 PM CDT	Severe Thunderstorm Warning	SHV	Jackson, Natchitoches, Ouachita, Winn	51 min
Mar 16, 11:11 PM CDT	Special Weather Statement	SHV	Bienville, De Soto, Red River	34 min
Mar 16, 11:40 PM CDT	Special Weather Statement	SHV	Caldwell, Winn	65 min
Mar 16, 11:44 PM CDT	Special Weather Statement	SHV	Sabine	31 min
Mar 16, 11:48 PM CDT	Special Weather Statement	SHV	Jackson, Lincoln, Ouachita	42 min
Mar 17, 12:08 AM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Jackson, Natchitoches, Ouachita, Red River, Sabine and 1 more	52 min
Mar 17, 12:33 AM CDT	Special Weather Statement	SHV	Caldwell, Grant, LaSalle	42 min
Mar 17, 12:40 AM CDT	Severe Thunderstorm Warning	SHV	Grant, LaSalle, Natchitoches, Sabine, Winn	65 min
Mar 17, 1:24 AM CDT	Special Weather Statement	SHV	LaSalle	36 min
Mar 17, 2:22 PM CDT	Freeze Warning	SHV	Howard, Sevier	19 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 2023 Every severe thunderstorm 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.