Alert archive / Louisiana / Flash Flood Warnings in 1998
Flash Flood Warning 29, NWS New Orleans, LA
NWS New Orleans, LA issued this flash flood warning at Sep 11, 1998, 5:34 PM CDT for Jefferson Parish, Orleans Parish, Louisiana. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Sep 11, 1998, 5:34 PM CDT (22:34 UTC)
- Expired
- Sep 11, 1998, 8:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Jefferson Parish, LA, Orleans Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 10.6 hours before the alert went out and 51 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
- 173 J/kg
- Mixed-layer CIN
- -30 J/kg
- Mixed-layer LCL
- 653 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 220 m²/s²
- 0-3 km storm-relative helicity
- 353 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Local storm report, Sep 11, 4:52 PM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT...UPDATED INFORMATION...
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
452 PM CDT THU SEP 11 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH LOCATION....
0540 PM CUT OFF LA TORNADO
09/10/98 LAFOURCHE *** 1 DEAD, 6 INJ ***
A TORNADO CUT A 4 MILE
PATH BETWEEN CUT OFF AND
LAROSE DAMAGING 56
RESIDENCES AND TWO
BUSINESSES.Local storm report, Sep 11, 4:52 PM CDT, 42 minutes before
PRELIMINARY LOCAL STORM REPORT...UPDATED INFORMATION...
NATIONAL WEATHER SERVICE OFFICE NEW ORLEANS LOUISIANA
452 PM CDT THU SEP 11 1998
TIME(CDT) .....CITY LOCATION..... STATE ...EVENT/REMARKS...
....PARISH LOCATION....
0540 PM CUT OFF LA TORNADO
09/10/98 LAFOURCHE *** 1 DEAD, 6 INJ ***
A TORNADO CUT A 4 MILE
PATH BETWEEN CUT OFF AND
LAROSE DAMAGING 56
RESIDENCES AND TWO
BUSINESSES.The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 10, 7:06 PM CDT | Tornado Warning | LIX | Jefferson | 29 min |
| Sep 10, 8:41 PM CDT | Tornado Warning | LIX | Saint Charles | 34 min |
| Sep 11, 10:02 AM CDT | Severe Thunderstorm Warning | LIX | Orleans, Saint Tammany | 43 min |
| Sep 11, 10:50 AM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany | 2 hr |
| Sep 11, 12:07 PM CDT | Tornado Warning | LIX | Plaquemines | 33 min |
| Sep 11, 12:51 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans, Plaquemines, Saint Bernard | 3 hr |
| Sep 11, 12:51 PM CDT | Flash Flood Warning | LIX | Saint Tammany | 3 hr |
| Sep 11, 2:14 PM CDT | Tornado Warning | LIX | Orleans, Saint Bernard | 36 min |
| Sep 11, 2:14 PM CDT | Tornado Warning | LIX | Orleans, Saint Bernard | 41 min |
| Sep 11, 5:15 PM CDT | Flash Flood Warning | LIX | Plaquemines, Saint Bernard | 3 hr |
| Sep 11, 8:35 AM CDT | Severe Thunderstorm Warning | LIX | Harrison, Jackson | 60 min |
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.