Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 79, NWS New Orleans, LA

September 1, 2012Washington Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Sep 1, 2012, 2:56 PM CDT for Washington Parish, Louisiana. It was in force for 10 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: Sep 1, 2012, 2:56 PM CDT (19:56 UTC)
Expired: Sep 1, 2012, 3:06 PM CDT
In force: 10 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Emergency: Flash flood emergency
Flood severity: None

County Washington Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.9 hours before the alert went out and 76 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1360 J/kg
Mixed-layer CIN: -17 J/kg
Mixed-layer LCL: 732 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -29 m²/s²
0-3 km storm-relative helicity: 14 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.

873 
WGUS54 KLIX 011956
FFWLIX
LAC117-012300-
/O.NEW.KLIX.FF.W.0079.120901T1956Z-120901T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
256 PM CDT SAT SEP 1 2012

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHEASTERN WASHINGTON PARISH IN SOUTHEAST LOUISIANA...

* UNTIL 600 PM CDT

* AT 251 PM CDT...ST TAMMANY PARISH OFFICE OF EMERGENCY MANAGEMENT 
REPORTED THAT THE PEARL RIVER DIVERSION CANAL LOCK AND DAM NUMBER 
TWO IS ABOUT TO FAIL. HEAVY SCOUR IS TAKING PLACE ALONG SIDE THE 
RELIEF SILL. THE CURRENT STAGE IS 18.5 FEET AT BUSH. 

  THIS IS A FLASH FLOOD EMERGENCY FOR ALL RESIDENTS AND INTEREST 
DOWNSTREAM OF PEARL RIVER LOCK AND DAM #2 NEAR BUSH DOWNSTREAM TO 
HIGHWAY 36 AT HICKORY. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

FLOOD WATERS WILL MOVE DOWN THE PEARL RIVER DIVERSION CANAL FROM THE 
LOCK NUMBER 2 TO HICKORY. 

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 3097 8973 3095 8975 3092 8975 3091 8977
      3090 8976 3090 8977 3088 8978 3086 8977
      3088 8984 3100 8980 3100 8973

$$


24/RR

1 follow-up statement

300 
WGUS74 KLIX 012006
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
306 PM CDT SAT SEP 1 2012

LAC117-012016-
/O.CAN.KLIX.FF.W.0079.000000T0000Z-120901T2300Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
WASHINGTON LA-
306 PM CDT SAT SEP 1 2012

...THE FLASH FLOOD WARNING HAS BEEN CANCELLED FOR NORTHEASTERN
WASHINGTON PARISH...

THIS WARNING WAS INADVERTENTLY ISSUED FOR THE INCORRECT LOCATION. A 
NEW WARNING WAS ISSUED FOR ST TAMMANY PARISH. SORRY FOR ANY 
CONFUSION.

LAT...LON 3097 8973 3095 8975 3092 8975 3091 8977
      3090 8976 3090 8977 3088 8978 3086 8977
      3088 8984 3100 8980 3100 8973

$$


24/RR

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 1, 5:11 AM CDT	Coastal Flood Warning	LIX	Saint Bernard, Saint James, Saint John the Baptist	12 hr
Sep 1, 5:17 AM CDT	Flash Flood Watch	LIX	Tangipahoa	9 hr
Sep 1, 3:04 PM CDT	Flash Flood Warning Emergency	LIX	Saint Tammany	6 hr
Sep 1, 5:04 PM CDT	Coastal Flood Advisory	LIX	Saint James, Saint John the Baptist	14 hr

Nearby

Flash Flood Warnings in Louisiana, 2012 Every 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.