Alert archive / Louisiana / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 49, NWS Jackson, MS
NWS Jackson, MS issued this severe thunderstorm warning at Jan 21, 1999, 8:03 PM CST for Catahoula Parish, Louisiana. It was in force for 32 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
- Jan 21, 1999, 8:03 PM CST (02:03 UTC)
- Expired
- Jan 21, 1999, 8:35 PM CST
- In force
- 32 min
- Issued by
- NWS Jackson, MS
- Area
- Whole counties
County Catahoula Parish, LA
The radar
The Ft Polk radar (KPOE), 121 km from the middle of the area, began a volume at 02:06 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jan 21, 8:30 PM CST | Thunderstorm Wind | Countywide, LA | Trees and power lines were blown down across the county. |
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 nearest sounding before it
Jackson, MS (KJAN), launched 00:00Z, 2.1 hours before the alert went out and 182 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
- 957 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 1350 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 263 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 4.8
The text
As transmitted, in the capitals the NWS used until 2016.
999 WUUS1 KJAN 220204 RRA SVRJAN LAC025-220235- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE JACKSON MS 803 PM CST THU JAN 21 1999 THE NATIONAL WEATHER SERVICE IN JACKSON HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... NORTHERN CATAHOULA PARISH IN NORTHEASTERN LOUISIANA * UNTIL 835 PM CST * AT 800 PM CST... RADAR INDICATED A SEVERE THUNDERSTORM 7 MILES WEST OF HARRISONBURG... OR NEAR AIMWELL MOVING NORTHEAST AT 45 MPH. THIS STORM WILL MAINLY AFFECT RURAL AREAS INCLUDING SICILY ISLAND AT 815 PM CST GO INSIDE A STURDY BUILDING AND STAY AWAY FROM WINDOWS A TORNADO WATCH IS IN EFFECT. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING. 67
The office that day
Everything else NWS Jackson, MS issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 21, 6:33 PM CST | Tornado Warning | JAN | Morehouse | 47 min |
| Jan 21, 7:07 PM CST | Severe Thunderstorm Warning | JAN | Richland | 48 min |
| Jan 21, 7:32 PM CST | Severe Thunderstorm Warning | JAN | Franklin | 48 min |
| Jan 21, 7:35 PM CST | Tornado Warning | JAN | West Carroll | 50 min |
| Jan 21, 8:12 PM CST | Severe Thunderstorm Warning | JAN | East Carroll | 48 min |
| Jan 21, 8:47 PM CST | Tornado Warning | JAN | Franklin | 48 min |
| Jan 21, 8:55 PM CST | Tornado Warning | JAN | Catahoula | 50 min |
| Jan 21, 9:21 PM CST | Severe Thunderstorm Warning | JAN | East Carroll | 49 min |
| Jan 21, 9:30 PM CST | Tornado Warning | JAN | Franklin | 35 min |
| Jan 21, 9:42 PM CST | Severe Thunderstorm Warning | JAN | Tensas | 48 min |
| Jan 21, 9:49 PM CST | Tornado Warning | JAN | East Carroll | 46 min |
| Jan 21, 9:55 PM CST | Tornado Warning | JAN | Catahoula | 50 min |
| Jan 21, 10:00 PM CST | Tornado Warning | JAN | Tensas | 50 min |
| Jan 21, 10:09 PM CST | Tornado Warning | JAN | Madison | 51 min |
| Jan 21, 10:36 PM CST | Tornado Warning | JAN | Franklin | 49 min |
| Jan 21, 11:12 PM CST | Tornado Warning | JAN | Madison | 48 min |
| Jan 22, 6:53 AM CST | Tornado Warning | JAN | Morehouse | 47 min |
| Jan 22, 7:33 AM CST | Tornado Warning | JAN | West Carroll | 37 min |
| Jan 22, 7:40 AM CST | Tornado Warning | JAN | Morehouse | 40 min |
| Jan 22, 11:51 AM CST | Severe Thunderstorm Warning | JAN | Catahoula, Concordia | 49 min |
| Jan 22, 12:10 PM CST | Tornado Warning | JAN | Catahoula | 50 min |
| Jan 22, 12:39 PM CST | Tornado Warning | JAN | Tensas | 46 min |
| Jan 22, 12:48 PM CST | Tornado Warning | JAN | Concordia | 47 min |
| Jan 22, 1:12 PM CST | Tornado Warning | JAN | Madison | 48 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; radar from the NEXRAD Level II archive.