Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 62, NWS New Orleans, LA

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

NWS New Orleans, LA issued this flash flood warning at Aug 29, 2012, 7:42 PM CDT for Saint Tammany Parish, Washington Parish, Louisiana; Hancock County, Pearl River County, Walthall County, Mississippi. It was in force for 4 hr. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Aug 29, 2012, 7:42 PM CDT (00:42 UTC)
Expired
Aug 29, 2012, 11:45 PM CDT
In force
4 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

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

What was reported inside it

TimeReportWhereRemark
Aug 29, 8:25 PM CDTFLASH FLOOD10 Se Poplarville, MSWATER FLOWING RAPIDLY OVER BARTH ROAD NEAR SILVER RUN AT CRANE CREEK BRIDGE AND PEN BRANCH.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 00:00Z, 0.7 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 00:00Z on 2012-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 408 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 00:00Z on 2012-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 299 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
408 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
464 m above ground
0-6 km bulk shear
55 kt
0-1 km storm-relative helicity
299 m²/s²
0-3 km storm-relative helicity
301 m²/s²
Significant tornado parameter
0.8
Supercell composite
6.3

Open this sounding in Storm Lab

The text

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

967 
WGUS54 KLIX 300042
FFWLIX
LAC103-117-MSC045-109-147-300445-
/O.NEW.KLIX.FF.W.0062.120830T0042Z-120830T0445Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
742 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...
  HANCOCK COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...WAVELAND...DIAMONDHEAD...BAY ST.
  LOUIS...
  PEARL RIVER COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...POPLARVILLE...PICAYUNE...
  WALTHALL COUNTY IN SOUTHERN MISSISSIPPI...

* UNTIL 1145 PM CDT

* AT 737 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  HEAVY RAINFALL ASSOCIATED WITH BANDS FROM TROPICAL STORM ISAAC.    
  THESE BANDS OF HEAVY RAINFALL CONTINUE TO STREAM NORTH ACROSS THE  
  WARNED AREA AND WILL PRODUCE AN ADDITIONAL 2 TO 4 INCHES OF        
  RAINFALL DURING THE NIGHTTIME HOURS.  FLASH FLOODING OF LOW LYING  
  AREAS AND SURGE FLOODING IN SOUTHERN ST. TAMMANY PARISH IS LIKELY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.

&&

LAT...LON 3134 9005 3113 9000 3108 8992 3108 8984
      3100 8983 3101 8935 3037 8934 3035 8937
      3031 8932 3017 8946 3016 8972 3025 8987
      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 29, 7:09 PM CDTFlash Flood WarningLIXAscension, East Baton Rouge, Livingston, Tangipahoa6 hr
Aug 29, 10:54 PM CDTRiver Flood WarningLIXEast Baton Rouge23 hr
Aug 29, 11:02 PM CDTRiver Flood WarningLIXEast Baton Rouge, Livingston4 days
Aug 29, 11:14 PM CDTRiver Flood WarningLIXEast Baton Rouge6 days
Aug 29, 11:16 PM CDTRiver Flood WarningLIXSaint Helena58 hr
Aug 29, 11:20 PM CDTRiver Flood WarningLIXSaint Helena69 hr
Aug 29, 11:22 PM CDTRiver Flood WarningLIXLivingston3 days
Aug 29, 11:31 PM CDTRiver Flood WarningLIXTangipahoa58 hr
Aug 29, 11:38 PM CDTRiver Flood WarningLIXSaint Tammany3 days
Aug 29, 11:45 PM CDTFlash Flood WarningLIXWashington5 hr
Aug 29, 11:47 PM CDTRiver Flood WarningLIXSaint Tammany47 hr
Aug 30, 12:06 AM CDTRiver Flood WarningLIXTangipahoa71 hr
Aug 30, 1:52 AM CDTFlash Flood WarningLIXSaint Tammany3 hr
Aug 30, 4:58 AM CDTFlash Flood Warning EmergencyLIXSaint Tammany4 hr
Aug 30, 8:01 AM CDTRiver Flood WarningLIXAscension, Livingston7 days
Aug 30, 8:01 AM CDTRiver Flood WarningLIXLivingston6 days
Aug 30, 9:17 AM CDTTornado WarningLIXOrleans, Saint Tammany28 min
Aug 30, 9:42 AM CDTRiver Flood WarningLIXAscension, Livingston5 days
Aug 30, 9:43 AM CDTFlash Flood WarningLIXSaint Tammany3 hr
Aug 30, 11:11 AM CDTFlash Flood Warning EmergencyLIXTangipahoa3 hr
Aug 30, 1:20 PM CDTFlash Flood WarningLIXSaint Charles, Saint John the Baptist3 hr
Aug 30, 4:21 PM CDTCoastal Flood WarningLIXSaint Bernard, Saint James, Saint John the Baptist49 hr
Aug 30, 4:34 PM CDTRiver Flood WarningLIXTangipahoa48 hr
Aug 29, 7:18 PM CDTTornado WarningLIXJackson27 min
Aug 29, 8:12 PM CDTFlash Flood WarningLIXHarrison, Jackson8 hr
Aug 29, 8:28 PM CDTTornado WarningLIXJackson62 min
Aug 29, 9:27 PM CDTTornado WarningLIXJackson63 min
Aug 29, 11:29 PM CDTRiver Flood WarningLIXPike59 hr
Aug 29, 11:31 PM CDTTornado WarningLIXHancock, Pearl River29 min
Aug 29, 11:54 PM CDTTornado WarningLIXHancock, Pearl River36 min
Aug 30, 2:33 AM CDTTornado WarningLIXHancock, Harrison, Pearl River27 min
Aug 30, 4:17 AM CDTFlash Flood WarningLIXJackson3 hr
Aug 30, 5:31 AM CDTTornado WarningLIXJackson29 min
Aug 30, 6:50 AM CDTTornado WarningLIXJackson40 min
Aug 30, 7:12 AM CDTFlash Flood Warning EmergencyLIXJackson4 hr
Aug 30, 7:29 AM CDTTornado WarningLIXJackson31 min
Aug 30, 7:30 AM CDTFlash Flood WarningLIXJackson3 hr
Aug 30, 8:26 AM CDTFlash Flood Warning EmergencyLIXPike3 hr
Aug 30, 10:32 AM CDTRiver Flood WarningLIXJackson10 days
Aug 30, 11:29 AM CDTFlash Flood WarningLIXJackson4 hr
Aug 30, 1:19 PM CDTRiver Flood WarningLIXHarrison34 hr
Aug 30, 3:24 PM CDTTornado WarningLIXJackson36 min

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.