Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 47, NWS New Orleans, LA

August 11, 2012Livingston Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Aug 11, 2012, 7:55 AM CDT for Livingston Parish, Louisiana. It was in force for 95 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 11, 2012, 7:55 AM CDT (12:55 UTC)
Expired
Aug 11, 2012, 9:30 AM CDT
In force
95 min
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

County Livingston Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 0.9 hours before the alert went out and 114 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, Slidell Radar S, LA at 12:00Z on 2012-08-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1542 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Slidell Radar S, LA at 12:00Z on 2012-08-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 13 square meters per square second.1939Sfc1 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
1542 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
711 m above ground
0-6 km bulk shear
18 kt
0-1 km storm-relative helicity
13 m²/s²
0-3 km storm-relative helicity
-32 m²/s²
Significant tornado parameter
-0.2
Supercell composite
-1.1

Open this sounding in Storm Lab

The text

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

292 
WGUS54 KLIX 111255
FFWLIX
LAC063-111500-
/O.NEW.KLIX.FF.W.0047.120811T1255Z-120811T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
755 AM CDT SAT AUG 11 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  CENTRAL LIVINGSTON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF DENHAM SPRINGS...

* UNTIL 1000 AM CDT

* AT 752 AM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED
  FLASH FLOODING FROM A THUNDERSTORM NEAR WALKER...OR 7 MILES EAST OF
  DENHAM SPRINGS...MOVING NORTHEAST AT 5 MPH.

* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO
  LIVINGSTON

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 TO 3 ARE POSSIBLE IN THE WARNED 
AREA.

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 3053 9098 3054 9072 3036 9065 3040 9096

$$

CAB
1 follow-up statement
553 
WGUS74 KLIX 111430
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
930 AM CDT SAT AUG 11 2012

LAC063-111440-
/O.CAN.KLIX.FF.W.0047.000000T0000Z-120811T1500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LIVINGSTON LA-
930 AM CDT SAT AUG 11 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR CENTRAL LIVINGSTON
PARISH...

THE HEAVY RAINS IN THE WARNED AREA HAS ENDED. 

LAT...LON 3053 9098 3054 9072 3036 9065 3040 9096

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 11, 2:55 AM CDTSpecial Marine WarningLIX95 min
Aug 11, 5:40 AM CDTFlash Flood WarningLIXSaint Tammany2 hr
Aug 11, 7:14 AM CDTFlash Flood WarningLIXSaint John the Baptist2 hr
Aug 11, 8:01 AM CDTSpecial Marine WarningLIX29 min
Aug 11, 8:27 AM CDTSpecial Marine WarningLIX63 min
Aug 11, 8:36 AM CDTSpecial Marine WarningLIX24 min
Aug 11, 10:00 AM CDTSpecial Marine WarningLIX30 min
Aug 11, 10:37 AM CDTSpecial Marine WarningLIX83 min
Aug 11, 11:26 AM CDTSpecial Marine WarningLIX34 min
Aug 11, 12:04 PM CDTSpecial Marine WarningLIX116 min

Nearby

Flash Flood Warnings in Louisiana, 2012Every flash flood warning in 2012

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.