Alert archive / Louisiana / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 98, NWS Shreveport, LA

March 31, 20138 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Mar 31, 2013, 11:58 AM CDT for 8 parishes in Louisiana. It was in force for 62 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 31, 2013, 11:58 AM CDT (16:58 UTC)
Expired: Mar 31, 2013, 1:00 PM CDT
In force: 62 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Caldwell Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Sabine Parish, LA, Winn Parish, LA

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 31, 9:20 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 5.0 hours before the alert went out and 124 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: 252 J/kg
Mixed-layer CIN: -155 J/kg
Mixed-layer LCL: 700 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 122 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.7

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 31, 11:01 AM CDT, 57 minutes earlier.

Area forecast discussion, Mar 31, 11:01 AM CDT, 57 minutes before

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Hazardous weather outlook, Mar 31, 11:20 AM CDT, 38 minutes before

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In the hours before

Local storm report, Mar 31, 11:36 AM CDT, 22 minutes before

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Local storm report, Mar 31, 11:47 AM CDT, 11 minutes before

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Local storm report, Mar 31, 11:49 AM CDT, 9 minutes before

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Local storm report, Mar 31, 11:51 AM CDT, 7 minutes before

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Local storm report, Mar 31, 11:53 AM CDT, 5 minutes before

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Local storm report, Mar 31, 11:56 AM CDT, 2 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 31, 7:32 AM CDT	Severe Thunderstorm Warning	SHV	Red River	43 min
Mar 31, 8:19 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Franklin, Morris, Red River, Titus	41 min
Mar 31, 8:49 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 1 more	41 min
Mar 31, 9:13 AM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Harrison, Marion, Morris, Upshur	47 min
Mar 31, 9:15 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Cass	60 min
Mar 31, 9:44 AM CDT	Tornado Warning	SHV	Harrison, Marion	31 min
Mar 31, 10:03 AM CDT	Severe Thunderstorm Warning	SHV	Cass, Harrison, Marion, Panola	27 min
Mar 31, 10:06 AM CDT	Severe Thunderstorm Warning	SHV	Gregg, Harrison, Panola, Rusk, Smith	39 min
Mar 31, 10:31 AM CDT	Severe Thunderstorm Warning	SHV	Cherokee, Harrison, Nacogdoches, Panola, Rusk, Shelby and 1 more	59 min
Mar 31, 11:29 AM CDT	Severe Thunderstorm Warning	SHV	Angelina, Cherokee, Nacogdoches, Sabine, San Augustine, Shelby	61 min
Mar 31, 10:00 AM CDT	Severe Thunderstorm Warning	SHV	Bossier, Caddo, Claiborne, Union, Webster	60 min
Mar 31, 10:57 AM CDT	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Caddo, Claiborne, Jackson, Lincoln and 5 more	63 min
Mar 31, 12:58 PM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle	32 min
Mar 31, 3:45 AM CDT	Severe Thunderstorm Warning	SHV	Columbia, Hempstead, Lafayette, Miller, Nevada	45 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2013 Every severe thunderstorm warning in 2013

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.