Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 48, NWS New Orleans, LA

February 21, 2008Jefferson Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Feb 21, 2008, 4:51 AM CST for Jefferson Parish, Louisiana. It was in force for 24 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: Feb 21, 2008, 4:51 AM CST (10:51 UTC)
Expired: Feb 21, 2008, 5:15 AM CST
In force: 24 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

County Jefferson 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
Feb 21, 3:23 AM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 10.9 hours before the alert went out and 303 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: 116 J/kg
Mixed-layer CIN: -43 J/kg
Mixed-layer LCL: 604 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 193 m²/s²
0-3 km storm-relative helicity: 295 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 New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Feb 21, 3:57 AM CST, 54 minutes earlier.

Area forecast discussion, Feb 21, 3:57 AM CST, 54 minutes before

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Hazardous weather outlook, Feb 21, 4:21 AM CST, 30 minutes before

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In the hours before

Special weather statement, Feb 21, 1:38 AM CST, 3 hours 13 minutes before

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Special weather statement, Feb 21, 3:56 AM CST, 55 minutes before

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Special weather statement, Feb 21, 4:31 AM CST, 20 minutes before

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The office that day

Everything else NWS New Orleans, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Feb 20, 7:23 PM CST	River Flood Warning	LIX	St. Mary	157 days
Feb 21, 1:55 AM CST	Special Marine Warning	LIX		65 min
Feb 21, 2:53 AM CST	Special Marine Warning	LIX		97 min
Feb 21, 4:18 AM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	42 min
Feb 21, 4:25 AM CST	Severe Thunderstorm Warning	LIX	Lafourche, Terrebonne	35 min
Feb 21, 4:27 AM CST	Special Marine Warning	LIX		93 min
Feb 21, 6:32 AM CST	Special Marine Warning	LIX		88 min
Feb 21, 7:15 AM CST	Special Marine Warning	LIX		90 min
Feb 21, 8:44 AM CST	Special Marine Warning	LIX		61 min
Feb 21, 5:43 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	47 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2008 Every severe thunderstorm warning in 2008

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.