Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 303, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Nov 21, 1997, 1:01 PM CST for Livingston Parish, Tangipahoa Parish, Louisiana. It was in force for 44 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Nov 21, 1997, 1:01 PM CST (19:01 UTC)
- Expired
- Nov 21, 1997, 1:45 PM CST
- In force
- 44 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Livingston Parish, LA, Tangipahoa Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Nov 21, 1:20 PM CST | Thunderstorm Wind | Natalbany, LA | Several trees were reported knocked down in the vicinity of Natalbany |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Nov 21, 11:15 AM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 7.0 hours before the alert went out and 89 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
- 20 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 981 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 207 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 severe thunderstorm 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, Nov 21, 10:30 AM CST, 2 hours 31 minutes before
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</html>Special weather statement, Nov 21, 10:50 AM CST, 2 hours 11 minutes before
LAZ049-050-057-058-040-038-039-MSZ077-071-221600- THUNDERSTORM OUTLOOK NATIONAL WEATHER SERVICE NEW ORLEANS LA 1030 AM CST FRI NOV 21 1997 THERE IS A RISK OF SEVERE THUNDERSTORMS AND LOCALLY HEAVY RAIN ACROSS SOUTH MISSISSIPPI AND SOUTHEAST LOUISIANA TODAY. THE ATMOSPHERE HAS BECOME VERY UNSTABLE AHEAD OF A SLOW MOVING COLD FRONT WHICH WILL BE ENTERING THE WESTERN PART OF THE STATE TODAY. THERE IS A STRONG UPPER LEVEL SYSTEM THAT IS DRIVING THE COLD FRONT SLOWLY EAST. AHEAD OF THE UPPER LEVEL SYSTEM THE WINDS ARE STRENGTHENING AT ALL LEVELS. THIS WILL HELP TO DESTABILIZE THE ATMOSPHERE BY BRINGING WARM...MOIST AIR INTO THE STATE. THIS COMBINATION OF EVENTS IS ALREADY PRODUCING NUMEROUS THUNDERSTORMS OVER PARTS OF SOUTHEAST LOUISIANA AND SOUTHWEST MISSISSIPPI WEST OF NEW ORLEANS...AND NEAR THE BATON ROUGE LAFAYETTE AREA LATE THIS MORNING. THE AREA OF THUNDERSTORMS WILL MOVE SLOWLY EAST FOR MOST OF THE DAY BEFORE LEAVING THE AREA BY THIS EVENING. REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WINDS...LARGE HAIL AND SOMETIMES TORNADOES. IN ADDITION...THERE IS THE ADDED RISK OF LOCALLY HEAVY RAIN WHICH COULD PRODUCING STREET FLOODING TODAY. THIS AND OTHER WEATHER INFORMATION CAN BE ACCESSED THROUGH NOAA WEATHER RADIO..LOCAL TELEVISION AND RADIO STATIONS.. CABLE OUTLETS..OR FROM OUR INTERNET HOMEPAGE ON THE WORLD WIDE WEB AT --> HTTP://WWW.SRH.NOAA.GOV (LOWER CASE) UNDER FORECAST OFFICES.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 21, 10:49 AM CST | Severe Thunderstorm Warning | LIX | East Feliciana, Pointe Coupee, West Feliciana | 41 min |
| Nov 21, 12:12 PM CST | Severe Thunderstorm Warning | LIX | Washington | 48 min |
| Nov 21, 1:20 PM CST | Severe Thunderstorm Warning | LIX | Saint Tammany, Washington | 40 min |
| Nov 21, 1:41 PM CST | Tornado Warning | LIX | Saint Tammany | 49 min |
| Nov 21, 7:45 AM CST | Severe Thunderstorm Warning | LIX | Wilkinson | 30 min |
| Nov 21, 1:56 PM CST | Tornado Warning | LIX | Hancock, Pearl River | 49 min |
| Nov 21, 2:43 PM CST | Tornado Warning | LIX | Hancock, Harrison | 62 min |
| Nov 21, 3:00 PM CST | Severe Thunderstorm Warning | LIX | Pearl River | 30 min |
| Nov 21, 3:46 PM CST | Tornado Warning | LIX | Harrison, Jackson | 44 min |
| Nov 21, 4:38 PM CST | Severe Thunderstorm Warning | LIX | Jackson | 52 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1997Every severe thunderstorm warning in 1997
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.