Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 182, NWS Lake Charles, LA

October 9, 2009Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana

NWS Lake Charles, LA issued this severe thunderstorm warning at Oct 9, 2009, 4:07 PM CDT for Iberia Parish, Saint Martin Parish, St. Mary Parish, Louisiana. It was in force for 53 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: Oct 9, 2009, 4:07 PM CDT (21:07 UTC)
Expired: Oct 9, 2009, 5:00 PM CDT
In force: 53 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Iberia Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 9.1 hours before the alert went out and 321 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: 1673 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 594 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 232 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 2.0
Supercell composite: 12.7

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 Lake Charles, LA wrote its last area forecast discussion before this severe thunderstorm warning went out at Oct 9, 1:17 PM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Oct 9, 1:17 PM CDT, 2 hours 50 minutes before

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Hazardous weather outlook, Oct 9, 6:22 AM CDT, 9 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
622 AM CDT FRI OCT 9 2009

GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-051>055-
TXZ180>182-201-215-216-101100-
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-
622 AM CDT FRI OCT 9 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
SHOWERS AND THUNDERSTORMS WILL INCREASE SIGNIFICANTLY BY THIS
AFTERNOON AS ANOTHER COLD FRONT APPROACHES AND SLOWLY MOVES
THROUGH THE REGION. THE MAIN WEATHER THREAT FROM THIS SYSTEM WILL
BE LOTS OF RAINFALL...EXPECTING ONE TO THREE INCHES THIS AFTERNOON
AND TONIGHT. ALSO...A FEW OF THE THUNDERSTORMS COULD REACH SEVERE
LIMITS...WITH STRAIGHT LINE WIND DAMAGE POSSIBLE.

.DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY
THE CHANCE OF SHOWERS AND THUNDERSTORMS WILL CONTINUE FOR THE
REMAINDER OF THE WEEKEND INTO NEXT WEEK. THE FRONT IS EXPECTED TO
STALL ACROSS THE COASTAL WATERS THIS WEEKEND AND MOVE BACK NORTH
BY MONDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE NECESSARY THIS AFTERNOON AND EVENING FOR
THE SEVERE WEATHER AND FLOODING THREAT.

In the hours before

Local storm report, Oct 9, 2:58 PM CDT, 1 hour 9 minutes before

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Local storm report, Oct 9, 3:05 PM CDT, 1 hour 2 minutes before

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Local storm report, Oct 9, 3:13 PM CDT, 54 minutes before

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Local storm report, Oct 9, 3:25 PM CDT, 42 minutes before

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Local storm report, Oct 9, 3:48 PM CDT, 19 minutes before

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Local storm report, Oct 9, 3:55 PM CDT, 12 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
Oct 9, 12:49 PM CDT	Special Marine Warning	LCH		116 min
Oct 9, 2:06 PM CDT	Severe Thunderstorm Warning	LCH	Acadia, Calcasieu, Cameron, Jefferson Davis, Lafayette, Saint Landry and 1 more	54 min
Oct 9, 2:47 PM CDT	Severe Thunderstorm Warning	LCH	Lafayette, Saint Landry, Saint Martin	28 min
Oct 9, 2:49 PM CDT	Special Marine Warning	LCH		56 min
Oct 9, 3:02 PM CDT	Severe Thunderstorm Warning	LCH	Cameron, Lafayette, Vermilion	58 min
Oct 9, 3:29 PM CDT	Severe Thunderstorm Warning	LCH	Iberia, Saint Martin, St. Mary, Vermilion	31 min
Oct 9, 3:30 PM CDT	Special Marine Warning	LCH		60 min
Oct 9, 4:15 PM CDT	Special Marine Warning	LCH		90 min
Oct 9, 5:39 PM CDT	Special Marine Warning	LCH		81 min
Oct 9, 12:41 PM CDT	Areal Flood Advisory	LCH	Jefferson, Orange	3 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.