Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 5, NWS New Orleans, LA

March 21, 2012Orleans Parish, Saint Bernard Parish, Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Mar 21, 2012, 5:25 PM CDT for Orleans Parish, Saint Bernard Parish, Saint Tammany Parish, Louisiana. It was in force for 2 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
Mar 21, 2012, 5:25 PM CDT (22:25 UTC)
Expired
Mar 21, 2012, 7:44 PM CDT
In force
2 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Orleans Parish, LA, Saint Bernard Parish, LA, Saint Tammany Parish, LA

What was reported inside it

TimeReportWhereRemark
Mar 21, 5:50 PM CDTFLASH FLOODSlidell, LAFLASH FLOODING OF BONFOUCA DRIVE IN PALM LAKE SUBDIVISION WAS REPORTED BY SLIDELL FIRE DEPARTMENT.

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 12:00Z, 10.4 hours before the alert went out and 23 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 2012-03-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 983 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 2012-03-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 363 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
983 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
519 m above ground
0-6 km bulk shear
46 kt
0-1 km storm-relative helicity
363 m²/s²
0-3 km storm-relative helicity
421 m²/s²
Significant tornado parameter
1.7
Supercell composite
10.7

Open this sounding in Storm Lab

The text

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

339 
WGUS54 KLIX 212225
FFWLIX
LAC071-087-103-220115-
/O.NEW.KLIX.FF.W.0005.120321T2225Z-120322T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
525 PM CDT WED MAR 21 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN ORLEANS PARISH IN SOUTHEAST LOUISIANA...
  WEST CENTRAL ST. BERNARD PARISH IN SOUTHEAST LOUISIANA...
  SOUTH CENTRAL ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...SLIDELL...EDEN ISLE...

* UNTIL 815 PM CDT

* AT 522 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  A LINE OF SLOW MOVING THUNDERSTORMS CAPABLE OF PRODUCING FLASH     
  FLOODING. THIS STORM WAS NEAR EDEN ISLE...MOVING NORTH AT 15       
  MPH. ONE HOUR RAINFALL AMOUNTS OF 1 TO 2 INCHES OF RAIN ARE        
  POSSIBLE WITH LOCALIZED HIGHER AMOUNTS.   

PRECAUTIONARY/PREPAREDNESS ACTIONS...

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES
AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

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 2989 8993 3010 8993 3016 8987 3011 8980
      3017 8975 3024 8987 3025 8994 3039 8994
      3039 8967 3007 8967 3006 8972 3002 8971
      3004 8981 3000 8984 2994 8982 2997 8973
      2995 8971 2992 8974 2988 8971 2985 8980

$$

7/ARM
1 follow-up statement
525 
WGUS74 KLIX 220044
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
744 PM CDT WED MAR 21 2012

LAC071-087-103-220050-
/O.CAN.KLIX.FF.W.0005.000000T0000Z-120322T0115Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. TAMMANY LA-ORLEANS LA-ST. BERNARD LA-
744 PM CDT WED MAR 21 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR WEST CENTRAL ST. 
BERNARD...EASTERN ORLEANS AND SOUTHEASTERN ST. TAMMANY PARISHES...

AT 740 PM CDT...THE THREAT OF FLASH FLOODING HAS ENDED ACROSS ST. 
BERNARD...ORLEANS...AND ST. TAMMANY PARISHES. MINOR STREET FLOODING 
MAY PERSIST IN POOR DRAINAGE AREAS...SO MOTORISTS SHOULD BE ON THE 
LOOKOUT FOR PONDING WATER.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 100 AM CDT THURSDAY MORNING
FOR SOUTHEAST LOUISIANA AND SOUTHERN MISSISSIPPI.

LAT...LON 2989 8993 3010 8993 3016 8987 3011 8980
      3017 8975 3024 8987 3025 8994 3039 8994
      3039 8967 3007 8967 3006 8972 3002 8971
      3004 8981 3000 8984 2994 8982 2997 8973
      2995 8971 2992 8974 2988 8971 2985 8980

$$

22/TD

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 7:34 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, Iberville, Livingston, Pointe Coupee, West Baton Rouge, West Feliciana56 min
Mar 21, 8:30 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, East Baton Rouge, Iberville60 min
Mar 21, 8:32 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Iberville, Pointe Coupee, West Baton Rouge, West Feliciana58 min
Mar 21, 8:45 AM CDTAreal Flood AdvisoryLIXAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Lafourche and 7 more2 hr
Mar 21, 8:49 AM CDTTornado WarningLIXAscension, Assumption, Iberville, Saint James38 min
Mar 21, 9:10 AM CDTSevere Thunderstorm WarningLIXEast Baton Rouge, East Feliciana, Saint Helena, West Feliciana65 min
Mar 21, 9:18 AM CDTSevere Thunderstorm WarningLIXAscension, Assumption, Lafourche, Saint James, Terrebonne57 min
Mar 21, 9:19 AM CDTTornado WarningLIXAscension, East Baton Rouge, Iberville, Livingston26 min
Mar 21, 9:29 AM CDTRiver Flood WarningLIXSaint Tammany, Washington19 days
Mar 21, 9:36 AM CDTSevere Thunderstorm WarningLIXAscension, Livingston, Saint Helena, Tangipahoa54 min
Mar 21, 9:49 AM CDTTornado WarningLIXEast Baton Rouge, East Feliciana, Livingston, Saint Helena56 min
Mar 21, 10:05 AM CDTRiver Flood WarningLIXTangipahoa4 days
Mar 21, 10:07 AM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 1 more53 min
Mar 21, 10:11 AM CDTSpecial Marine WarningLIX2 hr
Mar 21, 10:16 AM CDTTornado WarningLIXLivingston, Saint John the Baptist, Tangipahoa44 min
Mar 21, 10:24 AM CDTRiver Flood WarningLIXSaint Tammany49 hr
Mar 21, 10:24 AM CDTSevere Thunderstorm WarningLIXLivingston, Saint Helena, Tangipahoa, Washington51 min
Mar 21, 10:33 AM CDTSpecial Marine WarningLIX117 min
Mar 21, 11:01 AM CDTSevere Thunderstorm WarningLIXSaint Tammany, Tangipahoa, Washington59 min
Mar 21, 11:05 AM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Saint Charles, Saint John the Baptist, Tangipahoa, Terrebonne55 min
Mar 21, 11:11 AM CDTSmall Craft AdvisoryLIX5 hr
Mar 21, 11:12 AM CDTAreal Flood AdvisoryLIXJefferson, Lafourche, Saint Charles, Saint John the Baptist, Saint Tammany, Tangipahoa and 2 more2 hr
Mar 21, 11:18 AM CDTSevere Thunderstorm WarningLIXTangipahoa, Washington57 min
Mar 21, 11:52 AM CDTSevere Thunderstorm WarningLIXJefferson, Lafourche, Orleans, Plaquemines, Saint Bernard, Saint Charles53 min
Mar 21, 12:03 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington57 min
Mar 21, 12:04 PM CDTSpecial Marine WarningLIX116 min
Mar 21, 12:12 PM CDTTornado WarningLIXSaint Tammany36 min
Mar 21, 12:38 PM CDTTornado WarningLIXJefferson, Orleans, Saint Bernard25 min
Mar 21, 12:55 PM CDTSevere Thunderstorm WarningLIXSaint Tammany, Washington65 min
Mar 21, 1:16 PM CDTSpecial Marine WarningLIX119 min
Mar 21, 1:46 PM CDTTornado WarningLIXSaint Tammany29 min
Mar 21, 1:57 PM CDTSpecial Marine WarningLIX33 min
Mar 21, 2:05 PM CDTSevere Thunderstorm WarningLIXWashington55 min
Mar 21, 3:13 PM CDTSpecial Marine WarningLIX2 hr
Mar 21, 4:57 PM CDTAreal Flood AdvisoryLIXOrleans, Plaquemines, Saint Bernard, Saint Tammany2 hr
Mar 21, 5:44 PM CDTSpecial Marine WarningLIX2 hr

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