Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 67, NWS Lake Charles, LA

April 2, 20096 parishes in Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Apr 2, 2009, 11:04 AM CDT for 6 parishes in 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: Apr 2, 2009, 11:04 AM CDT (16:04 UTC)
Expired: Apr 2, 2009, 12:00 PM CDT
In force: 56 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Iberia Parish, LA, Lafayette Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA

The radar

The Lake Charles radar (KLCH), 129 km from the middle of the area, began a volume at 16:06 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 nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 4.1 hours before the alert went out and 128 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: 1386 J/kg
Mixed-layer CIN: -194 J/kg
Mixed-layer LCL: 858 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 298 m²/s²
0-3 km storm-relative helicity: 492 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.9

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 Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 2, 10:16 AM CDT, 48 minutes earlier.

Area forecast discussion, Apr 2, 10:16 AM CDT, 48 minutes before

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Hazardous weather outlook, Apr 2, 6:26 AM CDT, 4 hours 38 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
626 AM CDT THU APR 2 2009

GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-051>055-
TXZ180>182-201-215-216-031130-
SABINE LAKE-CALCASIEU LAKE-VERMILION BAY-
COASTAL WATERS FROM CAMERON, LA TO HIGH ISLAND, TX OUT 20 NM-
COASTAL WATERS FROM INTRACOASTAL CITY TO CAMERON, LA OUT 20 NM-
COASTAL WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY,
LA OUT 20 NM-
WATERS FROM CAMERON, LA TO HIGH ISLAND, TX EXTENDING FROM 20 NM
TO 60 NM-
WATERS FROM INTRACOASTAL CITY, LA TO CAMERON, LA EXTENDING FROM
20 NM TO 60 NM-
WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY, LA
EXTENDING FROM 20 NM TO 60 NM-VERNON-RAPIDES-AVOYELLES-BEAUREGARD-
ALLEN-EVANGELINE-ST. LANDRY-CALCASIEU-JEFFERSON DAVIS-ACADIA-
LAFAYETTE-UPPER ST. MARTIN-CAMERON-VERMILION-IBERIA-ST. MARY-
LOWER ST. MARTIN-TYLER-JASPER-NEWTON-HARDIN-JEFFERSON-ORANGE-
626 AM CDT THU APR 2 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST
GULF OF MEXICO...CENTRAL LOUISIANA...SOUTH CENTRAL LOUISIANA...
SOUTHWEST LOUISIANA...WEST CENTRAL LOUISIANA AND SOUTHEAST TEXAS.

.DAY ONE...TODAY AND TONIGHT

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR THE ENTIRE
OUTLOOK AREA TODAY.

A FRONTAL BOUNDARY IS FORECAST TO MOVE THROUGH THE AREA FROM MID
MORNING TO MID AFTERNOON...RESULTING IN ISOLATED TO SCATTERED
SHOWERS AND THUNDERSTORMS. SUFFICIENT WIND SHEAR AND INSTABILITY
WILL BE IN PLACE TO SUPPORT SEVERE THUNDERSTORMS...WITH LARGE
HAIL...DAMAGING WINDS...AND TORNADOES ALL POSSIBLE.

SHOWERS AND THUNDERSTORMS WILL COME TO AND END BY LATE AFTERNOON
AS DRY AIR MOVES INTO THE AREA FROM THE WEST.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

STORM SPOTTER ACTIVATION MAY BE REQUIRED TODAY.

13

In the hours before

Special weather statement, Apr 2, 9:37 AM CDT, 1 hour 27 minutes before

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Local storm report, Apr 2, 9:44 AM CDT, 1 hour 20 minutes before

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Local storm report, Apr 2, 9:46 AM CDT, 1 hour 18 minutes before

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Local storm report, Apr 2, 9:52 AM CDT, 1 hour 12 minutes before

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Local storm report, Apr 2, 10:14 AM CDT, 50 minutes before

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Local storm report, Apr 2, 10:56 AM CDT, 8 minutes before

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The office that day

Everything else NWS Lake Charles, LA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 2, 5:08 AM CDT	Lake Wind Advisory	LCH	Allen, Avoyelles, Beauregard, Evangeline, Lafayette, Rapides and 3 more	13 hr
Apr 2, 5:24 AM CDT	Special Marine Warning	LCH		111 min
Apr 2, 5:29 AM CDT	Small Craft Advisory for Winds	LCH		16 hr
Apr 2, 8:33 AM CDT	Severe Thunderstorm Warning	LCH	Allen, Beauregard, Vernon	27 min
Apr 2, 9:20 AM CDT	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	25 min
Apr 2, 9:38 AM CDT	Special Marine Warning	LCH		22 min
Apr 2, 9:39 AM CDT	Special Marine Warning	LCH		66 min
Apr 2, 10:44 AM CDT	Special Marine Warning	LCH		61 min
Apr 2, 11:34 AM CDT	Severe Thunderstorm Warning	LCH	Saint Martin	17 min
Apr 2, 8:54 AM CDT	River Flood Warning	LCH	Hardin, Jefferson	59 hr

Nearby

Severe Thunderstorm Warnings in Louisiana, 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; radar from the NEXRAD Level II archive.