Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 18, NWS New Orleans, LA
NWS New Orleans, LA issued this severe thunderstorm warning at Jan 22, 1999, 4:40 PM CST for Saint Helena Parish, Tangipahoa Parish, Louisiana; Amite County, Pike County, Mississippi. It was in force for 45 min. 7 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 22, 1999, 4:40 PM CST (22:40 UTC)
- Expired
- Jan 22, 1999, 5:25 PM CST
- In force
- 45 min
- Issued by
- NWS New Orleans, LA
- Area
- Whole counties
Counties Saint Helena Parish, LA, Tangipahoa Parish, LA, Amite County, MS, Pike County, MS
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jan 22, 4:45 PM CST | Thunderstorm Wind | Greensburg, LA | The St. Helena Parish Sheriff's Office reported that several trees were blown down on Louisiana Highways 43 and 37. |
| Jan 22, 4:50 PM CST | Thunderstorm Wind | Liberty, MS | The Amite County Sheriff's Department reported trees blown down west of Liberty. |
| Jan 22, 4:50 PM CST | Hail 1.75 | Liberty, MS | The Amite County Sheriff's Department reported golfball size hail west of Liberty. |
| Jan 22, 4:50 PM CST | Thunderstorm Wind | Gillisburg, MS | Thunderstorm winds destroyed storage barns and tore the roof off of a dairy barn at a local dairy farm. The storm also downed numerous trees around the area. |
| Jan 22, 5:15 PM CST | Tornado F0 | Osyka, MS | The Pike County Civil Defense reported a brief tornado touchdown just west of Osyka that blew the roof of a house off. |
| Jan 22, 5:25 PM CST | Thunderstorm Wind | Summit, MS | The Pike County Civil Defense reported trees blown down from Summit to Magnolia. |
| Jan 22, 5:25 PM CST | Thunderstorm Wind | Mc Comb, MS | A storm spotter reported that thunderstorm winds blew a tree down on a house. |
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 22, 3:00 PM CST | Tornado Watch | SPC | 6 hr |
| Jan 22, 2:15 PM CST | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 10.7 hours before the alert went out and 115 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
- 1281 J/kg
- Mixed-layer CIN
- -1 J/kg
- Mixed-layer LCL
- 515 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 386 m²/s²
- 0-3 km storm-relative helicity
- 445 m²/s²
- Significant tornado parameter
- 2.4
- Supercell composite
- 12.2
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 22, 2:50 PM CST | Severe Thunderstorm Warning | LIX | West Feliciana | 30 min |
| Jan 22, 3:33 PM CST | Severe Thunderstorm Warning | LIX | Iberville | 32 min |
| Jan 22, 3:51 PM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, West Baton Rouge | 49 min |
| Jan 22, 4:05 PM CST | Severe Thunderstorm Warning | LIX | East Feliciana, Livingston, Saint Helena | 35 min |
| Jan 22, 5:33 PM CST | Severe Thunderstorm Warning | LIX | Ascension, Assumption, Saint James | 42 min |
| Jan 22, 5:46 PM CST | Severe Thunderstorm Warning | LIX | Livingston | 34 min |
| Jan 22, 5:55 PM CST | Severe Thunderstorm Warning | LIX | Lafourche, Terrebonne | 30 min |
| Jan 22, 3:06 PM CST | Tornado Warning | LIX | Wilkinson | 34 min |
| Jan 22, 5:07 PM CST | Tornado Warning | LIX | Pike | 33 min |
| Jan 22, 5:18 PM CST | Tornado Warning | LIX | Walthall | 32 min |
Nearby
Severe Thunderstorm Warnings in Louisiana, 1999Severe Thunderstorm Warnings in Mississippi, 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.