Alert archive / Mississippi / Flash Flood Warnings in 2012

Flash Flood Warning 6, NWS New Orleans, LA

March 21, 2012Hancock County, Mississippi

NWS New Orleans, LA issued this flash flood warning at Mar 21, 2012, 6:50 PM CDT for Hancock County, Mississippi. It was in force for 3 hr. 4 reports 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, 6:50 PM CDT (23:50 UTC)
Expired
Mar 21, 2012, 9:45 PM CDT
In force
3 hr
Issued by
NWS New Orleans, LA
Area
Storm-based polygon
Flood severity
None

County Hancock County, MS

What was reported inside it

TimeReportWhereRemark
Mar 21, 7:00 PM CDTFLASH FLOODKiln, MSSTREET FLOODING REPORTED.
Mar 21, 7:15 PM CDTFLASH FLOODWaveland, MSSTREET FLOODING REPORTED.
Mar 21, 8:15 PM CDTFLASH FLOODDiamondhead, MSWIDESPREAD STREET FLOODING REPORTED. SOME SEVERE STREET FLOODING OCCURRED WITH AN ESTIMATED TWO AND A HALF FEET WATER DEPTH AT DEEPEST POINTS.
Mar 21, 8:30 PM CDTFLASH FLOODBay St. Louis, MSSTREET FLOODING REPORTED.

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, 11.8 hours before the alert went out and 24 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.

957 
WGUS54 KLIX 212350
FFWLIX
MSC045-220245-
/O.NEW.KLIX.FF.W.0006.120321T2350Z-120322T0245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  HANCOCK COUNTY IN SOUTHERN MISSISSIPPI...
  THIS INCLUDES THE CITIES OF...WAVELAND...DIAMONDHEAD...BAY ST.
  LOUIS...

* UNTIL 945 PM CDT

* AT 646 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  A LINE OF SLOW MOVING THUNDERSTORMS CAPABLE OF PRODUCING FLASH     
  FLOODING ACROSS THE SOUTHERN HALF PORTIONS OF HANCOCK COUNTY.      
  TORRENTIAL RAIN WILL PRODUCE ONE HOUR RAINFALL AMOUNTS RANGING     
  FROM 1 TO 2 INCHES WITH LOCALIZED AMOUNTS OF 3 TO 4 INCHES.

* LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO STENNIS
  SPACE CENTER...PEARLINGTON AND KILN

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 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 3054 8934 3037 8934 3035 8937 3034 8934
      3031 8932 3025 8942 3017 8946 3019 8946
      3019 8955 3018 8958 3029 8965 3031 8963
      3050 8964

$$

7/ARM

The office that day

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

IssuedProductOfficeCountiesLasted
Mar 21, 4:29 AM CDTCoastal Flood WarningLIX20 hr
Mar 21, 9:10 AM CDTSevere Thunderstorm WarningLIXAmite, Wilkinson65 min
Mar 21, 9:29 AM CDTRiver Flood WarningLIXHancock, Pearl River19 days
Mar 21, 9:38 AM CDTRiver Flood WarningLIXPike, Walthall44 hr
Mar 21, 9:46 AM CDTRiver Flood WarningLIXPearl River4 days
Mar 21, 10:35 AM CDTSevere Thunderstorm WarningLIXAmite, Pike55 min
Mar 21, 11:12 AM CDTAreal Flood AdvisoryLIXPike, Walthall2 hr
Mar 21, 11:18 AM CDTSevere Thunderstorm WarningLIXPike, Walthall57 min
Mar 21, 12:03 PM CDTSevere Thunderstorm WarningLIXWalthall57 min
Mar 21, 12:49 PM CDTAreal Flood AdvisoryLIXHancock, Harrison, Jackson, Pearl River116 min
Mar 21, 12:55 PM CDTSevere Thunderstorm WarningLIXHancock, Pearl River65 min
Mar 21, 1:46 PM CDTTornado WarningLIXPearl River29 min
Mar 21, 2:05 PM CDTSevere Thunderstorm WarningLIXPearl River55 min
Mar 21, 3:50 PM CDTSevere Thunderstorm WarningLIXHancock, Harrison, Jackson40 min
Mar 21, 3:52 PM CDTAreal Flood AdvisoryLIXHancock, Harrison, Jackson113 min
Mar 21, 6:18 PM CDTAreal Flood AdvisoryLIXHancock, Pearl River117 min

Nearby

Flash Flood Warnings in Mississippi, 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.