Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 2, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Jan 2, 1999, 6:56 AM CST for Lafourche Parish, Saint Charles Parish, Saint John the Baptist Parish, Louisiana. It was in force for 34 min. 3 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
- Jan 2, 1999, 6:56 AM CST (12:56 UTC)
- Expired
- Jan 2, 1999, 7:30 AM CST
- In force
- 34 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Lafourche Parish, LA, Saint Charles Parish, LA, Saint John the Baptist Parish, LA
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jan 2, 7:00 AM CST | Thunderstorm Wind | Destrehan, LA | The St. Charles Department of Emergency Management reported that thunderstorm winds damaged a baseball backstop and scoreboard at a high school and blew down several trees on the property. |
| Jan 2, 7:00 AM CST | Thunderstorm Wind | Hahnville, LA | The St. Charles Department of Emergency Management reported that thunderstorm winds caused minor damage to the roofs of three buildings at a church-school complex. |
| Jan 2, 7:00 AM CST | Tornado F1 | Bayou Boeuf, 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 |
|---|---|---|---|
| Jan 2, 3:00 AM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 0.9 hours before the alert went out and 82 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
- 549 J/kg
- Mixed-layer CIN
- -11 J/kg
- Mixed-layer LCL
- 615 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 256 m²/s²
- 0-3 km storm-relative helicity
- 331 m²/s²
- Significant tornado parameter
- 0.7
- Supercell composite
- 4.7
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
The office that day
Everything else NWS New Orleans, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 2, 4:38 AM CST | Tornado Warning | LIX | Pointe Coupee | 32 min |
| Jan 2, 4:49 AM CST | Tornado Warning | LIX | West Feliciana | 31 min |
| Jan 2, 5:36 AM CST | Tornado Warning | LIX | East Feliciana, Saint Helena | 34 min |
| Jan 2, 6:26 AM CST | Tornado Warning | LIX | Tangipahoa, Washington | 34 min |
| Jan 2, 7:05 AM CST | Tornado Warning | LIX | Saint Charles, Saint John the Baptist | 30 min |
| Jan 2, 7:53 AM CST | Severe Thunderstorm Warning | LIX | Saint Tammany | 32 min |
| Jan 2, 8:09 AM CST | Tornado Warning | LIX | Saint Tammany | 16 min |
| Jan 2, 8:54 AM CST | Severe Thunderstorm Warning | LIX | Plaquemines | 21 min |
| Jan 2, 4:29 AM CST | Severe Thunderstorm Warning | LIX | Wilkinson | 31 min |
| Jan 2, 6:26 AM CST | Tornado Warning | LIX | Walthall | 34 min |
| Jan 2, 8:13 AM CST | Tornado Warning | LIX | Hancock | 32 min |
| Jan 2, 8:37 AM CST | Tornado Warning | LIX | Harrison | 33 min |
| Jan 2, 9:12 AM CST | Severe Thunderstorm Warning | LIX | Harrison, Jackson | 33 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1999Every severe thunderstorm warning in 1999
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.