Alert archive / Louisiana / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 107, NWS New Orleans, LA

June 5, 2011Jefferson Parish, Lafourche Parish, Louisiana

NWS New Orleans, LA issued this severe thunderstorm warning at Jun 5, 2011, 11:19 AM CDT for Jefferson Parish, Lafourche Parish, Louisiana. It was in force for 56 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: Jun 5, 2011, 11:19 AM CDT (16:19 UTC)
Expired: Jun 5, 2011, 12:15 PM CDT
In force: 56 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon

Counties Jefferson Parish, LA, Lafourche Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 4.3 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: 1941 J/kg
Mixed-layer CIN: -79 J/kg
Mixed-layer LCL: 1529 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 41 m²/s²
0-3 km storm-relative helicity: 61 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 New Orleans, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 5, 4:17 AM CDT, 7 hours 2 minutes earlier.

Area forecast discussion, Jun 5, 4:17 AM CDT, 7 hours 2 minutes before

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Hazardous weather outlook, Jun 5, 4:07 AM CDT, 7 hours 12 minutes before

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In the hours before

Special weather statement, Jun 5, 10:52 AM CDT, 27 minutes before

LAZ059>061-063-064-051700-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1052 AM CDT SUN JUN 5 2011

...STRONG THUNDERSTORM MOVING WEST AFFECTING ST. CHARLES PARISH...
LAFOURCHE PARISH...JEFFERSON PARISH...PLAQUEMINES PARISH...ST.
BERNARD PARISH...

AT 1050 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
STRONG THUNDERSTORM NEAR BELLE CHASSE...OR ABOUT 3 MILES SOUTHWEST OF
BELLE CHASSE...MOVING WEST AT 20 MPH.

THE STRONG THUNDERSTORM WILL AFFECT AREAS IN AND AROUND...HARVEY...
MARRERO...JEAN LAFITTE...LAFITTE...WESTWEGO...BARATARIA...AVONDALE...
BOUTTE AND DES ALLEMANDS

THE PRIMARY THREATS FROM THIS STORM ARE FREQUENT LIGHTNING AND WIND
GUSTS TO NEAR 45 MPH...WHICH COULD DOWN TREE LIMBS AND BLOW AROUND
UNSECURED SMALL OBJECTS. SEEK SHELTER IN A SAFE HOME OR BUILDING
UNTIL THIS STORM HAS PASSED.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 5, 1:06 AM CDT	Special Marine Warning	LIX		54 min
Jun 5, 4:06 AM CDT	Heat Advisory	LIX	East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Helena, Tangipahoa and 3 more	15 hr
Jun 5, 8:48 AM CDT	Special Marine Warning	LIX		57 min
Jun 5, 10:46 AM CDT	Special Marine Warning	LIX		29 min
Jun 5, 11:28 AM CDT	Special Marine Warning	LIX		92 min
Jun 5, 11:40 AM CDT	Special Marine Warning	LIX		95 min
Jun 5, 1:09 PM CDT	Special Marine Warning	LIX		66 min
Jun 5, 5:48 PM CDT	Severe Thunderstorm Warning	LIX	East Baton Rouge	27 min
Jun 5, 2:15 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	60 min
Jun 5, 2:49 PM CDT	Severe Thunderstorm Warning	LIX	Jackson	56 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2011 Every severe thunderstorm warning in 2011

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.