Alert archive / Louisiana / Flash Flood Warnings in 1998
Flash Flood Warning 33, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Sep 12, 1998, 8:48 AM CDT for Jefferson Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.
The facts
- Issued
- Sep 12, 1998, 8:48 AM CDT (13:48 UTC)
- Expired
- Sep 12, 1998, 11:00 AM CDT
- In force
- 2 hr
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties; the outline is the Mesonet’s reconstruction
Counties Jefferson Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 1.8 hours before the alert went out and 64 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
- 5 J/kg
- Mixed-layer CIN
- -147 J/kg
- Mixed-layer LCL
- 884 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 424 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KNEW 121407 RRA
FFWNEW
LAC051-071-075-087-089-095-121600-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING...CORRECTED EXPIRATION TIME ON HEADER LINE
NATIONAL WEATHER SERVICE NEW ORLEANS-BATON ROUGE LA
848 AM CDT SAT SEP 12 1998
THE NATIONAL WEATHER SERVICE HAS ISSUED A
* FLASH FLOOD WARNING FOR...
ORLEANS PARISH IN LOUISIANA
ST. BERNARD PARISH IN LOUISIANA
JEFFERSON PARISH IN LOUISIANA
PLAQUEMINES PARISH IN LOUISIANA
ST. CHARLES PARISH IN LOUISIANA
ST. JOHN THE BAPTIST
* UNTIL 1100 AM CDT
* AT 844 AM CDT WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY
RAIN EXTENDING FROM WESTERN LAKE PONTCHARTRAIN ACROSS ST
CHARLES AND JEFFERSON PARISHES INTO LAFOURCHE PARISH. THE AREA
OF HEAVY RAIN WAS MOVING NORTHEAST AT 15 MPH. THIS RAIN WILL
AFFECT THE GREATER NEW ORLEANS AREA THROUGH 1100 AM.
RAINFALL OF 2 TO 4 INCHES WILL LIKELY OCCUR WITH THESE THUNDERSTORMS
THROUGH 11AM. DUE TO SATURATED GROUND CONDITONS EXCESSIVE RUNOFF
WILL OCCUR WITH THESE STORMS AND CAUSE FLOODING OF ROADWAYS IN THE
NEW ORLEANS METRO AREA.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
DO NOT ATTEMPT TO CROSS DEEPLY FLOODED ROADWAYS OR WATERS OF UNKNOWN
DEPTH BY FOOT OR BY AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT
IMMEDIATELY AND SEEK HIGHER GROUND.
TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.
LAT...LON 2999 9050 2965 9010 2931 9003 2929 8946
3014 8971 3012 9037The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 12, 6:31 AM CDT | Flash Flood Warning | LIX | Ascension, Assumption, Saint James | 3 hr |
| Sep 12, 6:31 AM CDT | Flash Flood Warning | LIX | Lafourche, Terrebonne | 3 hr |
| Sep 12, 8:48 AM CDT | Flash Flood Warning | LIX | Orleans, Plaquemines, Saint Bernard | 2 hr |
| Sep 12, 11:03 AM CDT | Flash Flood Warning | LIX | Saint Tammany | 3 hr |
| Sep 12, 11:03 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 3 hr |
| Sep 12, 1:28 PM CDT | Flash Flood Warning | LIX | Plaquemines | 3 hr |
Nearby
Flash Flood Warnings in Louisiana, 1998Every flash flood warning in 1998
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.