Alert archive / Louisiana / Flash Flood Warnings in 2006

Flash Flood Warning 23, NWS New Orleans, LA

December 30, 2006Ascension Parish, Livingston Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Dec 30, 2006, 12:21 PM CST for Ascension Parish, Livingston Parish, Louisiana. It was in force for 114 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: Dec 30, 2006, 12:21 PM CST (18:21 UTC)
Expired: Dec 30, 2006, 2:15 PM CST
In force: 114 min
Issued by: NWS New Orleans, LA
Area: Whole counties

Counties Ascension Parish, LA, Livingston Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.4 hours before the alert went out and 108 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 674 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 413 m²/s²
0-3 km storm-relative helicity: 525 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WGUS54 KLIX 301823
FFWLIX
LAC005-063-302015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1221 PM CST SAT DEC 30 2006

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ASCENSION PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITIES OF...GONZALES...DONALDSONVILLE
  LIVINGSTON PARISH IN SOUTHEAST LOUISIANA
  THIS INCLUDES THE CITY OF DENHAM SPRINGS

* UNTIL 215 PM CST

* AT 1217 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR 
  INDICATED VERY HEAVY RAINS CAPABLE OF PRODUCING FLASH FLOODING IN 
  THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WATSON...  
  WALKER AND LIVINGSTON.

RADAR RAINFALL ESTIMATES SUGGEST THAT AS MUCH AS 3 INCHES OF 
RAINFALL MAY HAVE FALLEN IN WESTERN PORTIONS OF LIVINGSTON PARISH 
AND ACROSS MUCH OF ASCENSION PARISH. ADDITIONAL RAINFALL AMOUNTS OF 
1 TO 2 INCHES ARE POSSIBLE IN THE WARNED AREA THROUGH 2 PM. 

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 3008 9111 3034 9101 3035 9089 3029 9079
      3042 9095 3059 9096 3064 9091 3065 9057
      3048 9057 3034 9049 3024 9058 3020 9073
      3019 9071 3023 9064 3018 9064 3013 9092
      3008 9096 3007 9110

$$

24

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 New Orleans, LA wrote its last area forecast discussion before this flash flood warning went out at Dec 30, 3:37 AM CST, 8 hours 44 minutes earlier.

Area forecast discussion, Dec 30, 3:37 AM CST, 8 hours 44 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW ORLEANS LA
337 AM CST SAT DEC 30 2006

.DISCUSSION...

EARLY THIS MORNING THE SURFACE LOW WAS OVER WESTERN OKLAHOMA WITH
THE UPPER LOW OVER NEW MEXICO. THE COLD FRONT STRETCHED SOUTHWARD
ALONG THE TEXAS/LOUISIANA BORDER WITH A WARM FRONT ACROSS
SOUTHWESTERN AND SOUTH-CENTRAL LOUISIANA. THIS SYSTEM WILL SLOWLY
PROGRESS EASTWARD TODAY AND TOMORROW. THE PRECIP WATER VALUE LAST
NIGHT AT LCH WAS 1.65 INCHES...AND THIS SHOULD INCREASE AND SPREAD
EASTWARD INTO OUR AREA AS THE WARM FRONT PUSHES THROUGH. THE 0-3KM
HELICITY VALUES COULD BE ABOVE 500 M2/S2 IN THE AREA THIS
AFTERNOON. THIS...COUPLED WITH DIVERGENCE ALOFT AND A STRONG
850HPA JET OVER 60 KNOTS...SHOULD LEAD TO AN ACTIVE DAY FOR OUR
AREA. THE FIRST ROUND OF STORMS EARLY THIS MORNING ARE ASSOCIATED
WITH THE WARM FRONT PUSHING INTO OUR AREA...WITH THE NEXT LINE
NEAR THE COLD FRONT. THIS AFTERNOON WE COULD SEE HEAVY
RAINFALL...SEVERE THUNDERSTORMS...AND POSSIBLY A FEW TORNADOES.
ALTHOUGH THE RAINFALL WITH THIS SYSTEM MAY NOT BE AS HIGH AS WITH
SOME PREVIOUS EVENTS...THE GROUND IS ALREADY SATURATED IN MOST
AREAS AND IT WILL NOT TAKE TOO MUCH TO CAUSE FLOODING.
THEREFOR...ALTHOUGH THE HIGHEST RAINFALL TOTALS IN OUR AREA LIKELY
WILL BE FROM SOUTHWESTERN/SOUTH-CENTRAL MISSISSIPPI THROUGH
SOUTH-CENTRAL LOUISIANA...THE FLASH FLOOD WATCH HAS BEEN EXPANDED
ACROSS OUR ENTIRE PCWA. 2 TO 4 INCHES OF PRECIP ARE LIKELY...WITH
SOME AREAS POSSIBLY RECEIVING MORE THAN 6 INCHES.

THE NEXT CONCERN WILL BE THE SYSTEM THAT DEVELOPS IN THE WESTERN
GULF AND MOVES ACROSS LOUISIANA AND MISSISSIPPI ON THURSDAY.

&&

.PRELIMINARY POINT TEMPS/POPS...
MCB  71  57  66  43 / 100  70  40  10
BTR  72  57  67  44 / 100  70  40  10
MSY  74  60  68  49 / 100  70  40  20
GPT  71  60  67  48 / 100  80  50  30

&&

.LIX WATCHES/WARNINGS/ADVISORIES...
LA...FLASH FLOOD WATCH FROM NOON CST TODAY THROUGH SUNDAY MORNING FOR
     LAZ058-LAZ059-LAZ060-LAZ061-LAZ062-LAZ063-LAZ064-LAZ065-
     LAZ066-LAZ067-LAZ068-LAZ069-LAZ070.

     FLASH FLOOD WATCH FROM NOON CST TODAY THROUGH SUNDAY MORNING FOR
     LAZ034-LAZ035-LAZ036-LAZ037-LAZ038-LAZ039-LAZ040-LAZ046-
     LAZ047-LAZ048-LAZ049-LAZ050-LAZ056-LAZ057.

GM...SMALL CRAFT ADVISORY UNTIL 6 PM CST THIS AFTERNOON FOR GMZ530-
     GMZ550-GMZ570.

     SMALL CRAFT ADVISORY UNTIL MIDNIGHT CST TONIGHT FOR GMZ555-
     GMZ575.

MS...FLASH FLOOD WATCH FROM NOON CST TODAY THROUGH SUNDAY MORNING FOR
     MSZ080-MSZ081-MSZ082.

     FLASH FLOOD WATCH FROM NOON CST TODAY THROUGH SUNDAY MORNING FOR
     MSZ068-MSZ069-MSZ070-MSZ071-MSZ077.

GM...SMALL CRAFT ADVISORY UNTIL 6 PM CST THIS AFTERNOON FOR GMZ530-
     GMZ550-GMZ570.

     SMALL CRAFT ADVISORY UNTIL MIDNIGHT CST TONIGHT FOR GMZ555-
     GMZ575.

&&

25

Hazardous weather outlook, Dec 30, 11:17 AM CST, 1 hour 4 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1117 AM CST SAT DEC 30 2006

GMZ530-550-555-570-575-LAZ034>040-046>050-056>070-MSZ068>071-077-
080>082-311230-
PASCAGOULA TO SW PASS MISSISSIPPI RIVER OUT 20 NM-
PASCAGOULA TO SW PASS MISSISSIPPI RIVER 20-60 NM OUT-
SW PASS MISSISSIPPI RIVER TO ATCHAFALAYA RIVER OUT 20 NM-
SW PASS MISSISSIPPI RIVER TO ATCHAFALAYA RIVER 20-60 NM OUT-AMITE-
ASCENSION-ASSUMPTION-EAST BATON ROUGE-EAST FELICIANA-HANCOCK-
HARRISON-IBERVILLE-JACKSON-LAKES PONTCHARTRAIN AND MAUREPAS-
LIVINGSTON-LOWER JEFFERSON-LOWER LAFOURCHE-LOWER PLAQUEMINES-
LOWER ST BERNARD-LOWER TERREBONNE-ORLEANS-PEARL RIVER-PIKE-
POINTE COUPEE-ST CHARLES-ST HELENA-ST JAMES-ST JOHN THE BAPTIST-
ST TAMMANY-TANGIPAHOA-UPPER JEFFERSON-UPPER LAFOURCHE-
UPPER PLAQUEMINES-UPPER ST BERNARD-UPPER TERREBONNE-WALTHALL-
WASHINGTON-WEST BATON ROUGE-WEST FELICIANA-WILKINSON-
1117 AM CST SAT DEC 30 2006

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF THE GULF OF
MEXICO...SOUTHEASTERN LOUISIANA...AND SOUTHERN MISSISSIPPI.

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS...
THUNDERSTORMS WILL CONTINUE THIS AFTERNOON AS A COLD FRONT SLOWLY
APPROACHES THE AREA. STRONG UPPER-LEVEL DYNAMICS COUPLED WITH WARM...
MOIST AIR WILL CREATE A SLIGHT RISK OF SEVERE THUNDERSTORMS. THE
PRIMARY THREATS WILL BE DAMAGING WINDS AND POSSIBLY A FEW TORNADOES.
MOST OF THE THUNDERSTORM ACTIVITY WILL MOVE EAST OF THE AREA
LATE TONIGHT INTO EARLY SUNDAY.

RAINFALL...
DUE TO THE SLOW MOVEMENT OF THIS SYSTEM...RAINFALL TOTALS AREAWIDE
WILL BE 2 TO 4 INCHES. LOCALLY HIGHER AMOUNTS OF 6 OR MORE INCHES ARE
POSSIBLE...ESPECIALLY ACROSS SOUTH-CENTRAL LOUISIANA AND SOUTHWEST
MISSISSIPPI. A FLASH FLOOD WATCH IS IN EFFECT ACROSS THE ENTIRE
FORECAST AREA. DUE TO THE ALREADY SATURATED GROUND...FLOODING COULD
QUICKLY BECOME A PROBLEM.

SEVERAL AREA RIVERS ARE FORECAST TO RISE ABOVE FLOOD STAGE.  PLEASE
REFER TO THE LATEST RIVER FLOOD WARNINGS FOR SPECIFICS PERTAINING
TO YOUR AREA.

MARINE...
STRONG SOUTHERLY TO SOUTHEASTERLY WINDS OF 20 TO 25 KNOTS WILL
SHIFT TO THE SOUTHWEST LATER TODAY AND BEGIN TO DIMINISH. THIS
WILL CREATE HAZARDOUS CONDITIONS FOR SMALL CRAFT. TIDES WILL
REMAIN ABOVE NORMAL THIS AFTERNOON...AND WILL BEGIN TO SUBSIDE
LATE TONIGHT.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THUNDERSTORMS...
MOST THUNDERSTORM ACTIVITY WILL MOVE EAST OF THE AREA EARLY
SUNDAY. SCATTERED THUNDERSTORMS ARE POSSIBLE AGAIN WEDNESDAY
NIGHT THROUGH THURSDAY NIGHT.

RAINFALL...
THE HEAVIEST RAINFALL SHOULD BE EAST OF THE AREA ON SUNDAY.
HOWEVER...SOME LINGERING SHOWER ACTIVITY MAY CONTINUE BEHIND THE MAIN
LINE OF STORMS.  FLOODING COULD REMAIN A PROBLEM THROUGH SUNDAY
MORNING.

.SPOTTER INFORMATION STATEMENT...

THE ACTIVATION OF STORM SPOTTERS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL...IN SUPPORT OF SEVERE WEATHER
OPERATIONS...IS REQUESTED AT THIS TIME.

92/JSS

In the hours before

Local storm report, Dec 30, 11:07 AM CST, 1 hour 14 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
1107 AM CST SAT DEC 30 2006

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1035 AM     FLASH FLOOD      MARINGOUIN              30.49N 91.52W
12/30/2006                   IBERVILLE          LA   EMERGENCY MNGR

            EMERGENCY MANAGEMENT REPORTS EXTENSIVE FLOODING ACROSS
            MUCH OF THE PARISH WITH SEVERAL STREETS CLOSED AND AT
            LEAT ONE HOME FLOODED. RADAR ESTIMATES SHOW OVER THREE
            INCHES OF RAINFALL ACROSS THE ENTIRE PARISH WITH A SWATH
            OF SIX TO EIGHT INCHES FROM BAYOU SORREL TO NEAR
            MARINGOUIN.

1043 AM     FLASH FLOOD      ERWINVILLE              30.53N 91.41W
12/30/2006                   WEST BATON ROUGE   LA   EMERGENCY MNGR

            REPORTS OF NUMEROUS STREETS CLOSED AND SOME HOMES
            FLOODED. MORE DETAILS TO BE FORWARDED LATER.

1053 AM     HEAVY RAIN       BATON ROUGE AIRPORT     30.53N 91.15W
12/30/2006  M2.27 INCH       EAST BATON ROUGE   LA   ASOS

            MEASURED IN ONE HOUR. 3.65 INCHES SINCE MIDNIGHT.

&&

RICKS

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 30, 3:10 AM CST	Severe Thunderstorm Warning	LIX	Livingston, Saint Helena	35 min
Dec 30, 7:14 AM CST	Severe Thunderstorm Warning	LIX	Iberville, Pointe Coupee, West Feliciana	61 min
Dec 30, 8:34 AM CST	Tornado Warning	LIX	Pointe Coupee	26 min
Dec 30, 10:04 AM CST	Tornado Warning	LIX	East Baton Rouge	26 min
Dec 30, 10:23 AM CST	Tornado Warning	LIX	East Feliciana	37 min
Dec 30, 10:39 AM CST	Flash Flood Warning	LIX	Iberville, Pointe Coupee, West Baton Rouge	2 hr
Dec 30, 10:44 AM CST	Flash Flood Warning	LIX	East Baton Rouge	2 hr
Dec 30, 11:12 AM CST	Special Marine Warning	LIX		93 min
Dec 30, 11:28 AM CST	Tornado Warning	LIX	Saint Helena, Tangipahoa	32 min

Nearby

Flash Flood Warnings in Louisiana, 2006 Every flash flood warning in 2006

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.