Alert archive / Louisiana / Tornado Warnings in 1998
Tornado Warning 23, NWS New Orleans, LA
NWS New Orleans, LA issued this tornado warning at Sep 11, 1998, 2:14 PM CDT for Orleans Parish, Saint Bernard Parish, Louisiana. It was in force for 36 min. 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, 2:14 PM CDT (19:14 UTC)
- Expired
- Sep 11, 1998, 2:50 PM CDT
- In force
- 36 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Orleans Parish, LA, Saint Bernard Parish, LA
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 7.2 hours before the alert went out and 35 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 tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Sep 11, 11:00 AM CDT, 3 hours 14 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-112300- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT FRI SEP 11 1998 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF SOUTHEAST LOUISIANA...EXTREME SOUTH AND SOUTHWEST MISSISSIPPI AND COASTAL MISSISSIPPI. BANDS OF SHOWERS AND THUNDERSTORMS ASSOCIATED WITH TROPICAL STORM FRANCES WILL AFFECT SOUTHEAST LOUISIANA THIS AFTERNOON AND TONIGHT. GUSTY EAST WINDS UP TO 30 MILES AN HOUR IN BANDS OF SHOWERS AND THUNDERSTORM AND VERY HEAVY RAINFALL WILL BE THE MAIN THREAT. IN ADDITION...THE WIND PROFILE FROM THE SURFACE TO THE MIDDLE LAYERS OF THE ATMOSPHERE MAY PRODUCE SHORT LIVED ISOLATED WATERSPOUTS AND TORNADOEnS IN THE SLIGHT RISK AREA THIS AFTERNOON AND TONIGHT.
Special weather statement, Sep 11, 11:00 AM CDT, 3 hours 14 minutes before
LAZ034>040-046>050-056>070-MSZ068>071-077-080>082-112300- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1100 AM CDT FRI SEP 11 1998 THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS FOR ALL OF SOUTHEAST LOUISIANA...EXTREME SOUTH AND SOUTHWEST MISSISSIPPI AND COASTAL MISSISSIPPI. BANDS OF SHOWERS AND THUNDERSTORMS ASSOCIATED WITH TROPICAL STORM FRANCES WILL AFFECT SOUTHEAST LOUISIANA THIS AFTERNOON AND TONIGHT. GUSTY EAST WINDS UP TO 30 MILES AN HOUR IN BANDS OF SHOWERS AND THUNDERSTORM AND VERY HEAVY RAINFALL WILL BE THE MAIN THREAT. IN ADDITION...THE WIND PROFILE FROM THE SURFACE TO THE MIDDLE LAYERS OF THE ATMOSPHERE MAY PRODUCE SHORT LIVED ISOLATED WATERSPOUTS AND TORNADOEnS IN THE SLIGHT RISK AREA THIS AFTERNOON AND TONIGHT.
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 | 41 min |
| Sep 11, 5:15 PM CDT | Flash Flood Warning | LIX | Plaquemines, Saint Bernard | 3 hr |
| Sep 11, 5:34 PM CDT | Flash Flood Warning | LIX | Jefferson, Orleans | 3 hr |
Nearby
Tornado Warnings in Louisiana, 1998Every tornado warning in 1998Tornadoes 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.