Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 95, NWS New Orleans, LA

May 5, 2009Washington Parish, Louisiana; Walthall County, Mississippi

NWS New Orleans, LA issued this severe thunderstorm warning at May 5, 2009, 3:41 PM CDT for Washington Parish, Louisiana; Walthall County, Mississippi. It was in force for 49 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: May 5, 2009, 3:41 PM CDT (20:41 UTC)
Expired: May 5, 2009, 4:30 PM CDT
In force: 49 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Washington Parish, LA, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 8.7 hours before the alert went out and 91 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: 2681 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 462 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 47 m²/s²
0-3 km storm-relative helicity: 80 m²/s²
Significant tornado parameter: 0.6
Supercell composite: 3.3

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 New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at May 5, 3:16 PM CDT, 25 minutes earlier.

Area forecast discussion, May 5, 3:16 PM CDT, 25 minutes before

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Hazardous weather outlook, May 5, 12:40 PM CDT, 3 hours 1 minute before

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In the hours before

Local storm report, May 5, 2:02 PM CDT, 1 hour 39 minutes before

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Special weather statement, May 5, 3:27 PM CDT, 14 minutes before

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Nearby

Severe Thunderstorm Warnings in Louisiana, 2009 Severe Thunderstorm Warnings in Mississippi, 2009 Every severe thunderstorm warning in 2009

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.