Alert archive / Louisiana / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 99, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Mar 7, 1998, 4:46 PM CST for Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 34 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
- Mar 7, 1998, 4:46 PM CST (22:46 UTC)
- Expired
- Mar 7, 1998, 5:20 PM CST
- In force
- 34 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Saint Charles Parish, LA, Saint John the Baptist Parish, LA
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Mar 7, 1:30 PM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 10.8 hours before the alert went out and 73 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 520 m above ground
- 0-6 km bulk shear
- 57 kt
- 0-1 km storm-relative helicity
- 325 m²/s²
- 0-3 km storm-relative helicity
- 480 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
731 WUUS1 KNEW 072244 RRA SVRNEW LAC089-095-072320- BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 446 PM CST SAT MAR 7 1998 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS LA HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 520 PM CST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN SOUTHEASTERN LOUISIANA ...ST JOHN PARISH ...ST CHARLES PARISH AT 444 PM CST...RADAR INDICATED A CLUSTER OF SEVERE THUNDERSTORMS FROM AIRLINE HIGHWAY SOUTH OF SORRENTO...ACROSS GRAMERCY...TO NEAR LAPLACE. LARGE HAIL IS EXPECTED WITH THESE STORMS. MOVEMENT WAS TO THE NORTHWEST 60 MPH. A TORNADO WATCH IS ALSO IN EFFECT FOR THE WARNED AREA. REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 7, 3:51 AM CST | Severe Thunderstorm Warning | LIX | Washington | 59 min |
| Mar 7, 4:19 AM CST | Severe Thunderstorm Warning | LIX | Livingston | 36 min |
| Mar 7, 4:24 AM CST | Tornado Warning | LIX | Saint Tammany | 31 min |
| Mar 7, 4:56 AM CST | Tornado Warning | LIX | Ascension, Iberville | 34 min |
| Mar 7, 5:07 AM CST | Tornado Warning | LIX | Saint Tammany | 33 min |
| Mar 7, 5:51 AM CST | Severe Thunderstorm Warning | LIX | Saint James | 34 min |
| Mar 7, 6:41 AM CST | Severe Thunderstorm Warning | LIX | Saint Tammany | 44 min |
| Mar 7, 8:10 AM CST | Severe Thunderstorm Warning | LIX | Pointe Coupee, West Feliciana | 35 min |
| Mar 7, 4:14 PM CST | Severe Thunderstorm Warning | LIX | Assumption | 61 min |
| Mar 7, 4:20 PM CST | Severe Thunderstorm Warning | LIX | West Feliciana | 30 min |
| Mar 7, 4:41 PM CST | Flash Flood Warning | LIX | Saint Bernard | 4 hr |
| Mar 7, 5:00 PM CST | Severe Thunderstorm Warning | LIX | Saint Tammany, Tangipahoa, Washington | 35 min |
| Mar 7, 5:44 PM CST | Severe Thunderstorm Warning | LIX | Terrebonne | 61 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1998Every severe thunderstorm 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.