Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 88, NWS Jackson, MS

July 20, 2012Catahoula Parish, Louisiana

NWS Jackson, MS issued this flash flood warning at Jul 20, 2012, 5:24 PM CDT for Catahoula Parish, Louisiana. It was in force for 50 min. 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 20, 2012, 5:24 PM CDT (22:24 UTC)
Expired
Jul 20, 2012, 6:14 PM CDT
In force
50 min
Issued by
NWS Jackson, MS
Area
Storm-based polygon
Flood severity
None

County Catahoula Parish, LA

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 12:00Z, 10.4 hours before the alert went out and 185 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, Lake Charles Mun, LA at 12:00Z on 2012-07-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2709 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Lake Charles Mun, LA at 12:00Z on 2012-07-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -12 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
2709 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
675 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
-12 m²/s²
0-3 km storm-relative helicity
60 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.

550 
WGUS54 KJAN 202224
FFWJAN
LAC025-210030-
/O.NEW.KJAN.FF.W.0088.120720T2224Z-120721T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE JACKSON MS
524 PM CDT FRI JUL 20 2012

THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN CATAHOULA PARISH IN NORTHEAST LOUISIANA...
  THIS INCLUDES THE CITY OF LARTO...

* UNTIL 730 PM CDT

* AT 524 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR DETECTED
  THUNDERSTORMS PRODUCING VERY HEAVY RAIN 7 MILES NORTHWEST OF
  LARTO...MOVING SOUTH AT 10 MPH. ESTIMATED RADAR RAINFALL AMOUNTS...
  ON THE ORDER OF TWO TO FOUR INCHES...HAVE OCCURRED IN THE PAST
  HOUR.

* THE STORM PRODUCING THUNDERSTORMS PRODUCING VERY HEAVY RAIN WILL
  OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED PARISH.

VERY HEAVY RAINFALL WILL CONTINUE OVER THE WARNED AREA FOR THE NEXT
TWO HOURS WITH AN ADDITIONAL ONE TO THREE INCHES POSSIBLE.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE WATER COVERS THE ROADWAY. WHEN ENCOUNTERING FLOODED ROADS
MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.

&&

LAT...LON 3139 9201 3156 9201 3155 9188 3137 9186
      3131 9187 3130 9201 3133 9202 3138 9202

$$

OLB
1 follow-up statement
617 
WGUS74 KJAN 202314
FFSJAN

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE JACKSON MS
614 PM CDT FRI JUL 20 2012

LAC025-202325-
/O.CAN.KJAN.FF.W.0088.000000T0000Z-120721T0030Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
CATAHOULA LA-
614 PM CDT FRI JUL 20 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN
CATAHOULA PARISH...

RAINFALL HAS ENDED IN THE WARNED AREA.

LAT...LON 3139 9201 3156 9201 3155 9188 3137 9186
      3131 9187 3130 9201 3133 9202 3138 9202

$$

OLB

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 19, 7:20 PM CDTSpecial Weather StatementJANCatahoula, Concordia30 min
Jul 19, 7:58 PM CDTSpecial Weather StatementJANCatahoula47 min
Jul 20, 4:21 PM CDTSpecial Weather StatementJANCatahoula29 min
Jul 20, 5:02 PM CDTSevere Thunderstorm WarningJANCatahoula43 min
Jul 20, 6:45 PM CDTSpecial Weather StatementJANConcordia30 min
Jul 20, 6:46 PM CDTSpecial Weather StatementJANTensas29 min

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.