Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 35, NWS New Orleans, LA

July 19, 2012Saint Charles Parish, Saint John the Baptist Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 19, 2012, 6:03 PM CDT for Saint Charles Parish, Saint John the Baptist 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
Jul 19, 2012, 6:03 PM CDT (23:03 UTC)
Expired
Jul 19, 2012, 9:00 PM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 11.1 hours before the alert went out and 75 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 2012-07-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2009 joules per kilogram.LCLLFCEL10008507005003002001001 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 2012-07-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 27 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
2009 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
654 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
27 m²/s²
0-3 km storm-relative helicity
79 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.

988 
WGUS54 KLIX 192303
FFWLIX
LAC089-095-200200-
/O.NEW.KLIX.FF.W.0035.120719T2303Z-120720T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
603 PM CDT THU JUL 19 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  ST. CHARLES PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF HAHNVILLE...
  ST. JOHN THE BAPTIST PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...RESERVE...LAPLACE...

* UNTIL 900 PM CDT

* AT 559 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  HEAVY RAINFALL FROM THUNDERSTORMS ALONG A LINE EXTENDING FROM
  RESERVE TO 6 MILES SOUTHEAST OF DES ALLEMANDS...OR ALONG A LINE
  EXTENDING FROM RESERVE TO 12 MILES SOUTHWEST OF AVONDALE...MOVING
  SOUTHEAST AT 15 MPH. THIS HEAVY RAINFALL IS LIKELY LEADING TO FLASH
  FLOODING ACROSS THE WARNED AREA. 

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES 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 2987 9050 2996 9067 3009 9067 3018 9054
      3018 9049 3020 9046 3017 9042 3009 9041
      3007 9037 3007 9032 3004 9028 2990 9028
      2980 9021 2969 9030

$$
1 follow-up statement
892 
WGUS74 KLIX 200200
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
900 PM CDT THU JUL 19 2012

LAC089-095-200211-
/O.EXP.KLIX.FF.W.0035.000000T0000Z-120720T0200Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ST. JOHN THE BAPTIST LA-ST. CHARLES LA-
900 PM CDT THU JUL 19 2012

...THE FLASH FLOOD WARNING HAS EXPIRED FOR ST. CHARLES AND ST. JOHN
THE BAPTIST PARISHES...

LAT...LON 2987 9050 2996 9067 3009 9067 3018 9054
      3018 9049 3020 9046 3017 9042 3009 9041
      3007 9037 3007 9032 3004 9028 2990 9028
      2980 9021 2969 9030

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 18, 8:22 PM CDTSpecial Marine WarningLIX23 min
Jul 18, 8:30 PM CDTAreal Flood AdvisoryLIXSaint Tammany2 hr
Jul 18, 8:42 PM CDTSpecial Marine WarningLIX48 min
Jul 18, 8:51 PM CDTAreal Flood AdvisoryLIXJefferson, Orleans, Plaquemines114 min
Jul 19, 8:45 AM CDTSpecial Marine WarningLIX30 min
Jul 19, 12:05 PM CDTSpecial Marine WarningLIX40 min
Jul 19, 12:43 PM CDTSpecial Marine WarningLIX62 min
Jul 19, 1:13 PM CDTSpecial Marine WarningLIX32 min
Jul 19, 2:17 PM CDTAreal Flood AdvisoryLIXSaint Tammany118 min
Jul 19, 2:50 PM CDTSpecial Marine WarningLIX55 min
Jul 19, 2:56 PM CDTFlash Flood WarningLIXSaint Tammany2 hr
Jul 19, 3:37 PM CDTFlash Flood WatchLIXAssumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more49 hr
Jul 19, 3:43 PM CDTFlash Flood WarningLIXSaint Tammany2 hr
Jul 19, 4:12 PM CDTAreal Flood AdvisoryLIXLivingston, Saint Helena, Tangipahoa2 hr
Jul 19, 5:03 PM CDTFlash Flood WarningLIXSaint Tammany117 min
Jul 19, 5:48 PM CDTAreal Flood AdvisoryLIXSaint Charles, Saint James, Saint John the Baptist117 min
Jul 19, 6:30 PM CDTAreal Flood AdvisoryLIXAscension, Assumption, Iberville2 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; the sounding from the Mesonet's radiosonde archive.