Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 56, NWS New Orleans, LA

August 29, 2012Pearl River County, Walthall County, Mississippi; Saint Tammany Parish, Washington Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Aug 29, 2012, 1:51 PM CDT for Pearl River County, Walthall County, Mississippi; Saint Tammany Parish, Washington Parish, Louisiana. It was in force for 3 hr. 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 29, 2012, 1:51 PM CDT (18:51 UTC)
Expired
Aug 29, 2012, 4:45 PM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Saint Tammany Parish, LA, Washington Parish, LA, Pearl River County, MS, Walthall County, MS

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 6.9 hours before the alert went out and 58 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 2012-08-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 625 joules per kilogram.LCLEL10008507005003002001001 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, Slidell Radar S, LA at 12:00Z on 2012-08-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 298 square meters per square second.19395878Sfc1 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
625 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
465 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
298 m²/s²
0-3 km storm-relative helicity
338 m²/s²
Significant tornado parameter
0.9
Supercell composite
8.7

Open this sounding in Storm Lab

The text

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

606 
WGUS54 KLIX 291851
FFWLIX
LAC103-117-MSC109-147-292145-
/O.NEW.KLIX.FF.W.0056.120829T1851Z-120829T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
151 PM CDT WED AUG 29 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...SLIDELL...MANDEVILLE...EDEN ISLE...
  COVINGTON...
  WASHINGTON PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...FRANKLINTON...BOGALUSA...
  PEARL RIVER COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...POPLARVILLE...PICAYUNE...
  WALTHALL COUNTY IN SOUTHERN MISSISSIPPI...

* UNTIL 445 PM CDT

* AT 142 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  VERY HEAVY RAINFALL FROM AN OUTER BAND ASSOCIATED WITH HURRICANE   
  ISAAC.  A RAIN GAUGE IN ANGIE REPORTED OVER 7 INCHES OF RAIN IN    
  THE LAST 2 HOURS.  FLASH FLOODING IS LIKELY ACROSS THE WARNED      
  AREA.  MODERATE TO HEAVY RAINFALL WILL CONTINUE INTO THE LATE      
  AFTERNOON.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

&&

LAT...LON 3134 9005 3113 9000 3108 8984 3100 8983
      3100 8934 3065 8934 3065 8954 3052 8955
      3046 8969 3022 8962 3019 8952 3015 8958
      3026 8998 3036 9010 3037 9024 3074 9026
      3091 9035 3100 9035 3100 9026 3135 9025

$$


DUNN
1 follow-up statement
314 
WGUS74 KLIX 292017
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
317 PM CDT WED AUG 29 2012

LAC103-117-MSC109-147-292145-
/O.CON.KLIX.FF.W.0056.000000T0000Z-120829T2145Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WALTHALL MS-PEARL RIVER MS-ST. TAMMANY LA-WASHINGTON LA-
317 PM CDT WED AUG 29 2012

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 445 PM CDT FOR PEARL
RIVER AND WALTHALL COUNTIES...AND WASHINGTON AND ST. TAMMANY
PARISHES...

AT 315 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED VERY
HEAVY RAIN CONTINUING ACROSS THE WARNED AREA ASSOCIATED WITH BANDS 
FROM TROPICAL STORM ISAAC.  THE MODERATE TO HEAVY RAINFALL WILL 
CONTINUE INTO THE EVENING HOURS.  ADDITIONAL RAINFALL AMOUNTS OF 2 
TO 4 INCHES WILL BE POSSIBLE THROUGH EVENING.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 400 PM CDT WEDNESDAY
AFTERNOON FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

&&

LAT...LON 3134 9005 3113 9000 3108 8984 3100 8983
      3100 8934 3065 8934 3065 8954 3052 8955
      3046 8969 3022 8962 3019 8952 3015 8958
      3026 8998 3036 9010 3037 9024 3074 9026
      3091 9035 3100 9035 3100 9026 3135 9025

$$


DUNN

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 9:21 PM CDTRiver Flood WarningLIXPike, Walthall4 days
Aug 28, 9:37 PM CDTRiver Flood WarningLIXHancock, Pearl River11 days
Aug 28, 9:43 PM CDTRiver Flood WarningLIXHancock, Pearl River13 days
Aug 28, 9:47 PM CDTRiver Flood WarningLIXPearl River5 days
Aug 28, 9:53 PM CDTRiver Flood WarningLIXPearl River4 days
Aug 28, 9:58 PM CDTRiver Flood WarningLIXJackson6 days
Aug 28, 10:13 PM CDTRiver Flood WarningLIXHarrison4 days
Aug 29, 3:06 AM CDTTornado WarningLIXJackson24 min
Aug 29, 4:09 AM CDTTornado WarningLIXJackson21 min
Aug 29, 4:39 AM CDTFlash Flood WarningLIXJackson3 hr
Aug 29, 4:52 AM CDTTornado WarningLIXHancock, Harrison23 min
Aug 29, 4:55 AM CDTTornado WarningLIXJackson20 min
Aug 29, 5:18 AM CDTTornado WarningLIXJackson27 min
Aug 29, 5:36 AM CDTTornado WarningLIXJackson24 min
Aug 29, 6:20 AM CDTTornado WarningLIXHarrison25 min
Aug 29, 8:58 AM CDTTornado WarningLIXHancock, Harrison17 min
Aug 29, 9:15 AM CDTTornado WarningLIXHancock, Pearl River11 min
Aug 29, 10:49 AM CDTTornado WarningLIXHancock, Harrison, Pearl River26 min
Aug 29, 12:20 PM CDTTornado WarningLIXHancock, Harrison, Pearl River25 min
Aug 29, 12:28 PM CDTTornado WarningLIXHarrison32 min
Aug 29, 1:00 PM CDTTornado WarningLIXHarrison30 min
Aug 29, 1:20 PM CDTFlash Flood WarningLIXHarrison3 hr
Aug 29, 3:48 PM CDTTornado WarningLIXHarrison27 min
Aug 29, 4:15 PM CDTFlash Flood WarningLIXHarrison4 hr
Aug 29, 4:44 PM CDTFlash Flood WarningLIXPearl River, Walthall3 hr
Aug 29, 5:14 PM CDTTornado WarningLIXHarrison31 min
Aug 29, 6:30 PM CDTTornado WarningLIXHarrison30 min
Aug 28, 8:54 PM CDTRiver Flood WarningLIXTangipahoa7 days
Aug 28, 9:02 PM CDTRiver Flood WarningLIXSaint Tammany6 days
Aug 28, 9:08 PM CDTRiver Flood WarningLIXSaint Tammany4 days
Aug 28, 9:25 PM CDTRiver Flood WarningLIXWashington5 days
Aug 28, 9:31 PM CDTRiver Flood WarningLIXSaint Tammany8 days
Aug 29, 12:57 AM CDTFlash Flood WarningLIXJefferson, Orleans, Plaquemines, Saint Bernard, Saint Charles6 hr
Aug 29, 4:02 AM CDTFlash Flood Warning EmergencyLIXPlaquemines6 hr
Aug 29, 6:54 AM CDTFlash Flood WarningLIXJefferson, Orleans, Saint Bernard, Saint Charles3 hr
Aug 29, 10:11 AM CDTAreal Flood WarningLIXPlaquemines12 hr
Aug 29, 12:26 PM CDTSpecial Marine WarningLIX64 min
Aug 29, 12:34 PM CDTFlash Flood WarningLIXJefferson, Orleans, Saint Charles, Saint John the Baptist3 hr
Aug 29, 1:31 PM CDTSpecial Marine WarningLIX29 min
Aug 29, 1:53 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston, Tangipahoa3 hr
Aug 29, 6:01 PM CDTFlash Flood WarningLIXLafourche, Saint Charles, Saint John the Baptist3 hr

Nearby

Flash Flood Warnings in Mississippi, 2012Flash 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.