Alert archive / Louisiana / Flash Flood Warnings in 2011

Flash Flood Warning 13, NWS New Orleans, LA

June 7, 2011Orleans Parish, Louisiana

NWS New Orleans, LA issued this flash flood warning at Jun 7, 2011, 2:39 PM CDT for Orleans Parish, Louisiana. It was in force for 111 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: Jun 7, 2011, 2:39 PM CDT (19:39 UTC)
Expired: Jun 7, 2011, 4:30 PM CDT
In force: 111 min
Issued by: NWS New Orleans, LA
Area: Storm-based polygon
Flood severity: None

County Orleans Parish, LA

The nearest sounding before it

Slidell Radar S, LA (KSIL), launched 12:00Z, 7.7 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: 639 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 1521 m above ground
0-6 km bulk shear: 11 kt
0-1 km storm-relative helicity: 30 m²/s²
0-3 km storm-relative helicity: 53 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.

829 
WGUS54 KLIX 071939
FFWLIX
LAC071-072130-
/O.NEW.KLIX.FF.W.0013.110607T1939Z-110607T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE NEW ORLEANS LA
239 PM CDT TUE JUN 7 2011

THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  SOUTHWESTERN ORLEANS PARISH IN SOUTHEAST LOUISIANA...
  THIS INCLUDES THE CITIES OF...NEW ORLEANS...EAST NEW ORLEANS...

* UNTIL 430 PM CDT

* AT 230 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED   
  FLASH FLOODING FROM A CLUSTER OF THUNDERSTORMS OVER THE CITY OF    
  NEW ORLEANS. A CLUSTER OF THUNDERSTORMS HAS ALREADY PRODUCED 2     
  INCHES OF RAIN OVER NEW ORLEANS. THIS CLUSTER WAS DRIFTING NORTH   
  AT 5 MPH. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

ADDITIONAL RAINFALL AMOUNTS OF 2 ARE POSSIBLE IN THE WARNED AREA AND 
FLOODING OF CITY STREETS IS LIKELY.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF URBAN 
AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER DRAINAGE 
AREAS AND LOW LYING SPOTS.

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 2995 9006 2991 9009 2992 9014 3001 9012
      3004 9010 3006 9003 3005 9000 3009 8991
      2999 8992 2998 8994 2998 8999 2995 9001
      2990 8992 2989 8993 2989 9000

$$

1 follow-up statement

285 
WGUS74 KLIX 072026
FFSLIX

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE NEW ORLEANS LA
326 PM CDT TUE JUN 7 2011

LAC071-072130-
/O.CON.KLIX.FF.W.0013.000000T0000Z-110607T2130Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
ORLEANS LA-
326 PM CDT TUE JUN 7 2011

...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 430 PM CDT FOR 
ORLEANS PARISH...

AT 318 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING RAINFALL OVER THE WARNED AREA. 
RADAR ESTIMATES OF 3 INCHES OCCURRED BETWEEN 2 AND 3 PM JUST EAST OF 
NEW ORLEANS CENTRAL BUSINESS DISTRICT. AN ADDITIONAL HALF INCH IS 
POSSIBLE AND MAY AGGRAVATE THE HEAVY RAIN SITUATION. 

LAT...LON 2995 9006 2991 9009 2992 9014 3001 9012
      3004 9010 3006 9003 3005 9000 3009 8991
      2999 8992 2998 8994 2998 8999 2995 9001
      2990 8992 2989 8993 2989 9000

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 7, 9:59 AM CDT	Special Marine Warning	LIX		61 min
Jun 7, 2:23 PM CDT	Severe Thunderstorm Warning	LIX	Jefferson, Orleans, Saint Bernard	53 min
Jun 7, 4:49 PM CDT	Severe Thunderstorm Warning	LIX	Washington	26 min
Jun 7, 4:59 PM CDT	Special Marine Warning	LIX		91 min
Jun 7, 5:41 PM CDT	Areal Flood Advisory	LIX	Washington	2 hr
Jun 7, 5:46 PM CDT	Areal Flood Advisory	LIX	East Feliciana, Saint Helena	119 min

Nearby

Flash Flood Warnings in Louisiana, 2011 Every flash flood warning in 2011

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.