Alert archive / Louisiana / Flash Flood Warnings in 2011
Flash Flood Warning 21, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Jul 27, 2011, 2:54 PM CDT for Jefferson Parish, Louisiana. It was in force for 3 hr. 2 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
- Jul 27, 2011, 2:54 PM CDT (19:54 UTC)
- Expired
- Jul 27, 2011, 6:00 PM CDT
- In force
- 3 hr
- Issued by
- NWS New Orleans, LA
- Area
- Storm-based polygon
- Flood severity
- None
County Jefferson Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 27, 3:45 PM CDT | FLASH FLOOD | 1 Sw Metairie, LA | PUBLIC REPORTED NUMEROUS STREETS FLOODED INCLUDING PARTS OF AIRLINE HIGHWAY...JEFFERSON HIGHWAY AND SOME SMALLER RESIDENTAL STREETS. JEFFERSON HIGHWAY WAS NEARLY IMPASSABLE AT CLEARVIEW. |
| Jul 27, 4:45 PM CDT | FLASH FLOOD | 1 Sw Metairie, LA | PUBLIC REPORTED NUMEROUS STREETS FLOODED INCLUDING PARTS OF AIRLINE HIGHWAY...JEFFERSON HIGHWAY AND SOME SMALLER RESIDENTAL STREETS. JEFFERSON HIGHWAY WAS NEARLY IMPASSABLE AT CLEARVIEW. |
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, 7.9 hours before the alert went out and 59 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.
- Mixed-layer CAPE
- 1697 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 453 m above ground
- 0-6 km bulk shear
- 1 kt
- 0-1 km storm-relative helicity
- -15 m²/s²
- 0-3 km storm-relative helicity
- 2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
379 WGUS54 KLIX 271954 FFWLIX LAC051-272300- /O.NEW.KLIX.FF.W.0021.110727T1954Z-110727T2300Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 254 PM CDT WED JUL 27 2011 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A * FLASH FLOOD WARNING FOR... NORTHWESTERN JEFFERSON PARISH IN SOUTHEAST LOUISIANA... THIS INCLUDES THE CITIES OF...METAIRIE...KENNER... * UNTIL 600 PM CDT * AT 252 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED FLASH FLOODING FROM A THUNDERSTORM OVER THE WARNED AREA. PRECAUTIONARY/PREPAREDNESS ACTIONS... ADDITIONAL RAINFALL AMOUNTS OF ONE TO TWO INCHES IS POSSIBLE IN THE WARNED AREA. 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. 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 2991 9027 3006 9028 3003 9012 2992 9014 $$ 98/SO
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 27, 6:35 AM CDT | Special Marine Warning | LIX | 40 min | |
| Jul 27, 12:52 PM CDT | Tornado Warning | LIX | Orleans, Saint Bernard | 23 min |
| Jul 27, 1:45 PM CDT | Areal Flood Advisory | LIX | Saint Charles | 2 hr |
| Jul 27, 1:56 PM CDT | Areal Flood Advisory | LIX | Ascension, Livingston | 2 hr |
| Jul 27, 3:29 PM CDT | Areal Flood Advisory | LIX | East Baton Rouge | 2 hr |
Nearby
Flash Flood Warnings in Louisiana, 2011Every 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive.