Alert archive / Louisiana / Severe Thunderstorm Warnings in 1997
Severe Thunderstorm Warning 86, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Apr 11, 1997, 11:31 AM CDT for Tangipahoa Parish, Louisiana. It was in force for 44 min. 2 reports 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
- Apr 11, 1997, 11:31 AM CDT (16:31 UTC)
- Expired
- Apr 11, 1997, 12:15 PM CDT
- In force
- 44 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
County Tangipahoa Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 11, 11:55 AM CDT | Tornado F0 | Ponchatoula, LA | |
| Apr 11, 12:10 PM CDT | Thunderstorm Wind | Ponchatoula, LA |
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 |
|---|---|---|---|
| Apr 11, 10:15 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 4.5 hours before the alert went out and 191 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
- 1830 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 354 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 111631 RRA SVRNEW LAC105-111715- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE NEW ORLEANS LA 1131 AM CDT FRI APR 11 1997 THE NATIONAL WEATHER SERVICE IN NEW ORLEANS HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 1215 PM CDT FOR RESIDENTS IN THE FOLLOWING LOCATION... IN SOUTHEAST LOUISIANA ...TANGIPAHOA PARISH AT 1130 AM NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM FROM NEAR AMITE TO LAKE MAUREPAS. THE THUNDERSTORM WAS MOVING NORTHEAST AROUND 35 MPH. COMMUNITIES IN THE PATH OF THIS THUNDERSTORM INCLUDE HAMMOND AND PONTHCATOULA. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 11, 9:29 AM CDT | Severe Thunderstorm Warning | LIX | Assumption, Lafourche, Saint James | 46 min |
| Apr 11, 9:36 AM CDT | Severe Thunderstorm Warning | LIX | Terrebonne | 69 min |
| Apr 11, 10:14 AM CDT | Severe Thunderstorm Warning | LIX | Lafourche, Saint James, Saint John the Baptist | 46 min |
| Apr 11, 10:27 AM CDT | Severe Thunderstorm Warning | LIX | Lafourche | 48 min |
| Apr 11, 10:45 AM CDT | Severe Thunderstorm Warning | LIX | Saint Charles | 45 min |
| Apr 11, 11:00 AM CDT | Flash Flood Warning | LIX | Assumption | 4 hr |
| Apr 11, 11:09 AM CDT | Severe Thunderstorm Warning | LIX | Jefferson, Orleans, Plaquemines | 66 min |
| Apr 11, 11:09 AM CDT | Severe Thunderstorm Warning | LIX | Saint Bernard | 66 min |
| Apr 11, 11:26 AM CDT | Tornado Warning | LIX | Jefferson, Lafourche | 34 min |
| Apr 11, 11:49 AM CDT | Tornado Warning | LIX | Saint Tammany, Tangipahoa | 26 min |
| Apr 11, 12:12 PM CDT | Tornado Warning | LIX | Saint Tammany, Tangipahoa | 33 min |
| Apr 11, 12:17 PM CDT | Severe Thunderstorm Warning | LIX | Orleans, Plaquemines, Saint Bernard | 43 min |
| Apr 11, 12:32 PM CDT | Severe Thunderstorm Warning | LIX | Washington | 43 min |
| Apr 11, 12:59 PM CDT | Severe Thunderstorm Warning | LIX | Plaquemines, Saint Bernard | 46 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.