Alert archive / Louisiana / Areal Flood Advisories in 2011

Areal Flood Advisory 21, NWS Lake Charles, LA

September 4, 2011Avoyelles Parish, Rapides Parish, Louisiana

NWS Lake Charles, LA issued this areal flood advisory at Sep 4, 2011, 7:48 PM CDT for Avoyelles Parish, Rapides Parish, Louisiana. It was in force for 117 min.

The area

The counties it named.

The facts

Issued: Sep 4, 2011, 7:48 PM CDT (00:48 UTC)
Expired: Sep 4, 2011, 9:45 PM CDT
In force: 117 min
Issued by: NWS Lake Charles, LA
Area: Storm-based polygon

Counties Avoyelles Parish, LA, Rapides Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 0.8 hours before the alert went out and 144 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: 40 J/kg
Mixed-layer CIN: -1 J/kg
Mixed-layer LCL: 733 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 207 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 areal flood advisory 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 areal flood advisory went out at Sep 4, 5:16 PM CDT, 2 hours 32 minutes earlier.

Area forecast discussion, Sep 4, 5:16 PM CDT, 2 hours 32 minutes before

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Hazardous weather outlook, Sep 4, 6:20 AM CDT, 13 hours 28 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
620 AM CDT SUN SEP 4 2011

GMZ430-432-435-450-452-455-470-472-475-LAZ027>033-041>045-051>055-
TXZ180-201-215-216-259>262-051130-
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 FROM 20 TO 60 NM-
WATERS FROM  INTRACOASTAL CITY TO CAMERON LA FROM 20 TO 60 NM-
WATERS FROM LOWER ATCHAFALAYA RIVER TO INTRACOASTAL CITY LA FROM
20 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-HARDIN-JEFFERSON-ORANGE-NORTHERN JASPER-
NORTHERN NEWTON-SOUTHERN JASPER-SOUTHERN NEWTON-
620 AM CDT SUN SEP 4 2011

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

.DAY ONE...TODAY AND TONIGHT
TROPICAL STORM LEE WILL MEANDER NEAR THE VERMILION PARISH COAST
THIS MORNING...GRADUALLY MOVING INLAND OVER ACADIANA DURING THE DAY.
TROPICAL STORM FORCE WINDS WILL CONTINUE TO AFFECT COASTAL
LOCATIONS EAST OF CAMERON...PORTIONS OF ACADIANA AS WELL AS MUCH
OF THE COASTAL WATERS.

IN ADDITION...HEAVY RAINFALL IS EXPECTED TO AFFECT PORTIONS OF
CENTRAL AND SOUTHERN LOUISIANA. AN ADDITIONAL 2 TO 5 INCHES OF
RAIN IS POSSIBLE TODAY...AND FLOODING WILL BE POSSIBLE ACROSS
THE AREA...ESPECIALLY ALONG SMALL STREAMS AND LOW LYING AREAS.
PLEASE SEE THE LATEST INFORMATION FROM THE HURRICANE LOCAL
STATEMENT UNDER NEWHLSLCH.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY
CONDITIONS WILL GRADUALLY IMPROVE ON MONDAY AS THE STORM BEGINS TO
MOVE NORTHEAST AWAY FROM THE REGION. A FAIRLY STRONG COLD FRONT
WILL MOVE THROUGH THE REGION MONDAY IN THE WAKE OF TROPICAL STORM
LEE...BRINGING MUCH DRIER AND COOLER AIR TO THE AREA FOR THE
REMAINDER OF THE WEEK.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION WILL NOT BE NEEDED.

24

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 4, 9:49 PM CDT	Areal Flood Warning	LCH	Avoyelles, Rapides	6 hr
Sep 5, 4:12 AM CDT	Small Craft Advisory	LCH		27 hr

Nearby

Areal Flood Advisories in Louisiana, 2011 Every areal flood advisory 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.