Alert archive / Louisiana / Flash Flood Warnings in 2012

Flash Flood Warning 33, NWS New Orleans, LA

July 19, 2012Saint Tammany Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jul 19, 2012, 3:43 PM CDT for 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: Jul 19, 2012, 3:43 PM CDT (20:43 UTC)
Expired: Jul 19, 2012, 5:45 PM CDT
In force: 2 hr
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Saint Tammany Parish, LA

What was reported inside it

Time	Report	Where	Remark
Jul 19, 4:15 PM CDT	FLASH FLOOD	2 Ene Mandeville, LA	PORTIONS OF HIGHWAY 59 AND SHARP WERE UNDER WATER AND HALF OF HIGHWAY 190 NEAR SOULT WERE BLOCKED OFF. CVS PARKING LOT AT CORNER OF 1088 AND 59 COMPLETELY FLOODED.

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, 8.7 hours before the alert went out and 43 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: 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.

472 
WGUS54 KLIX 192043
FFWLIX
LAC103-192245-
/O.NEW.KLIX.FF.W.0033.120719T2043Z-120719T2245Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

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

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTH CENTRAL ST. TAMMANY PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...MANDEVILLE...COVINGTON...

* UNTIL 545 PM CDT

* AT 340 PM CDT...NATIONAL WEATHER SERVICES DETECTED THUNDERSTORMS   
  CAPABLE OF PRODUCING FLASH FLOODING ACROSS SOUTH CENTRAL ST.       
  TAMMANY PARISH. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 1 TO 2 INCHES ARE POSSIBLE IN THE 
WARNED AREA OVER THE NEXT 2 HOURS.

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.

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 3047 9000 3033 9004 3033 9006 3036 9010
      3036 9013 3038 9019 3037 9021 3038 9022
      3050 9020

$$

95/DM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 18, 8:22 PM CDT	Special Marine Warning	LIX		23 min
Jul 18, 8:30 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	2 hr
Jul 18, 8:42 PM CDT	Special Marine Warning	LIX		48 min
Jul 18, 8:51 PM CDT	Areal Flood Advisory	LIX	Jefferson, Orleans, Plaquemines	114 min
Jul 19, 8:45 AM CDT	Special Marine Warning	LIX		30 min
Jul 19, 12:05 PM CDT	Special Marine Warning	LIX		40 min
Jul 19, 12:43 PM CDT	Special Marine Warning	LIX		62 min
Jul 19, 1:13 PM CDT	Special Marine Warning	LIX		32 min
Jul 19, 2:17 PM CDT	Areal Flood Advisory	LIX	Saint Tammany	118 min
Jul 19, 2:50 PM CDT	Special Marine Warning	LIX		55 min
Jul 19, 2:56 PM CDT	Flash Flood Warning	LIX	Saint Tammany	2 hr
Jul 19, 3:37 PM CDT	Flash Flood Watch	LIX	Assumption, East Baton Rouge, East Feliciana, Iberville, Pointe Coupee, Saint Bernard and 7 more	49 hr
Jul 19, 4:12 PM CDT	Areal Flood Advisory	LIX	Livingston, Saint Helena, Tangipahoa	2 hr
Jul 19, 5:03 PM CDT	Flash Flood Warning	LIX	Saint Tammany	117 min
Jul 19, 5:48 PM CDT	Areal Flood Advisory	LIX	Saint Charles, Saint James, Saint John the Baptist	117 min
Jul 19, 6:03 PM CDT	Flash Flood Warning	LIX	Saint Charles, Saint John the Baptist	3 hr
Jul 19, 6:30 PM CDT	Areal Flood Advisory	LIX	Ascension, Assumption, Iberville	2 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.