Alert archive / Louisiana / Flash Flood Warnings in 2009

Flash Flood Warning 44, NWS Lake Charles, LA

December 14, 20096 parishes in Louisiana

NWS Lake Charles, LA issued this flash flood warning at Dec 14, 2009, 10:19 PM CST for 6 parishes in Louisiana. It was in force for 6 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Dec 14, 2009, 10:19 PM CST (04:19 UTC)
Expired
Dec 15, 2009, 4:15 AM CST
In force
6 hr
Issued by
NWS Lake Charles, LA
Area
Storm-based polygon
Flood severity
None

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 04:21 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 00:00Z, 4.3 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-pSkew-T log-p diagram, Lake Charles Mun, LA at 00:00Z on 2009-12-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1181 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 00:00Z on 2009-12-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
1181 J/kg
Mixed-layer CIN
-44 J/kg
Mixed-layer LCL
665 m above ground
0-6 km bulk shear
39 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
46 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.8

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Dec 14, 4:20 PM CST, 5 hours 59 minutes earlier.

Area forecast discussion, Dec 14, 4:20 PM CST, 5 hours 59 minutes before
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Hazardous weather outlook, Dec 14, 6:34 AM CST, 15 hours 45 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LAKE CHARLES LA
634 AM CST MON DEC 14 2009

LAZ027>033-041>045-051>055-TXZ180>182-201-215-216-151245-
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-
634 AM CST MON DEC 14 2009

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

.DAY ONE...TODAY AND TONIGHT

A DENSE FOG ADVISORY IS IN EFFECT THROUGH MID MORNING. WIDESPREAD
FOG...REDUCING VISIBILITY TO LESS THAN ONE QUARTER OF A MILE AT
TIMES...WILL CONTINUE ACROSS THE AREA THROUGH MID MORNING. THE FOG
IS EXPECTED TO LIFT AFTER A FEW HOURS OF DAYTIME HEATING.

DENSE FOG IS LIKELY TO RETURN TO A GOOD PART OF THE AREA AGAIN
TONIGHT.

COVERAGE OF SHOWERS WILL BE ON THE INCREASE TODAY IN ADVANCE OF A
COLD FRONT THAT IS FORECAST TO MOVE THROUGH THE AREA ON TUESDAY.
TWO DAY RAINFALL TOTALS FROM TODAY THROUGH TUESDAY AFTERNOON ARE
EXPECTED TO RANGE FROM 1 TO 3 INCHES...WITH LOCALLY HIGHER
AMOUNTS POSSIBLE. THE HEAVIEST RAIN IS EXPECTED TO OCCUR LATE
TONIGHT THROUGH NOON TUESDAY AS THE FRONT NEARS AND MOVES
THROUGH THE AREA. A FLOOD WATCH IS IN EFFECT TONIGHT THROUGH
TUESDAY MORNING GENERALLY ALONG AND SOUTH OF THE INTERSTATE 10
CORRIDOR...WHERE THE HIGHEST RAINFALL TOTALS ARE EXPECTED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

RAINFALL FROM MONDAY NIGHT WILL CONTINUE INTO TUESDAY MORNING AS
THE COLD FRONT PROGRESSES THROUGH THE AREA. THE HEAVIEST
RAINFALL IS LIKELY TO OCCUR TUESDAY MORNING...ESPECIALLY OVER
PARTS OF SOUTH CENTRAL LOUISIANA...WHERE THE RISK OF FLOODING WILL
BE GREATEST.

.SPOTTER INFORMATION STATEMENT...
STORM SPOTTER ACTIVATION MAY BE REQUESTED TO MONITOR POTENTIAL
FLOODING TONIGHT INTO TUESDAY. PLEASE RELAY ANY REPORTS OF STREET
FLOODING OR FLASH FLOODING TO THE NATIONAL WEATHER SERVICE OR
LOCAL LAW ENFORCEMENT.

GMZ430-432-435-450-452-455-470-472-475-151245-
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-
634 AM CST MON DEC 14 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE NORTHWEST
GULF OF MEXICO.

.DAY ONE...TODAY AND TONIGHT

AREAS OF FOG...DENSE AT TIMES...WILL CONTINUE TO AFFECT THE GULF
WATERS TODAY AND TONIGHT. A DENSE FOG ADVISORY IS IN EFFECT UNTIL
NOON TODAY FOR THE NEARSHORE WATERS...AND COASTAL LAKES AND BAYS.
AN EXTENSION IN TIME OR EXPANSION IN AREA MAY BE REQUIRED.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A COLD FRONT WILL MOVE THROUGH THE GULF WATERS ON TUESDAY...WHICH
IS EXPECTED TO BRING AN END TO ANY FOG. HOWEVER...STRONG NORTH
WINDS...GUSTING NEAR GALE FORCE BEYOND 20 NM...AND ROUGH SEAS WILL
LIKELY REQUIRE A SMALL CRAFT ADVISORY AND/OR A GALE WARNING.

.SPOTTER INFORMATION STATEMENT...
MARINE INTERESTS SHOULD USE CAUTION THIS MORNING AND BE ALERT FOR
ABRUPT CHANGES IN VISIBILITY.

13

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 14, 9:14 PM CSTMarine Dense Fog AdvisoryLCH12 hr
Dec 14, 9:35 PM CSTDense Fog AdvisoryLCH8 hr
Dec 15, 1:38 AM CSTSevere Thunderstorm WarningLCHCameron, Vermilion25 min
Dec 15, 2:07 AM CSTSevere Thunderstorm WarningLCHIberia, Saint Martin, St. Mary23 min
Dec 15, 2:30 AM CSTSevere Thunderstorm WarningLCHSaint Martin, St. Mary35 min
Dec 15, 2:43 AM CSTFlash Flood WarningLCHRapides, Vernon4 hr
Dec 15, 4:32 AM CSTFlash Flood WarningLCHCameron, Iberia, Saint Martin, St. Mary, Vermilion6 hr
Dec 15, 9:04 AM CSTSevere Thunderstorm WarningLCHBeauregard, Calcasieu41 min
Dec 15, 9:29 AM CSTRiver Flood WarningLCHCalcasieu71 hr
Dec 15, 9:29 AM CSTRiver Flood WarningLCHAcadia, Jefferson Davis7 days
Dec 15, 9:29 AM CSTRiver Flood WarningLCHLafayette, Vermilion32 hr
Dec 15, 9:29 AM CSTRiver Flood WarningLCHVernon35 hr
Dec 15, 10:11 AM CSTAreal Flood WarningLCHIberia, Lafayette, Saint Martin, St. Mary12 hr

Nearby

Flash Flood Warnings in Louisiana, 2009Every flash flood 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.