Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 78
The Storm Prediction Center issued this tornado watch at Mar 8, 1999, 5:00 PM CST for 22 parishes in Louisiana; 9 counties in Mississippi. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 8, 1999, 5:00 PM CST (23:00 UTC)
- Expired
- Mar 8, 1999, 11:00 PM CST
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
All 31 counties
Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Madison Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Richland Parish, LA, Saint Landry Parish, LA, Tensas Parish, LA, Vernon Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Jefferson County, MS, Madison County, MS, Warren County, MS, Wilkinson County, MS
The radar
The Ft Polk radar (KPOE), 63 km from the middle of the area, began a volume at 23:03 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.
Warnings issued inside it
17 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 8, 5:38 PM CST | Severe Thunderstorm Warning | SHV | Ouachita | 47 min |
| Mar 8, 6:32 PM CST | Severe Thunderstorm Warning | JAN | Richland | 48 min |
| Mar 8, 6:52 PM CST | Tornado Warning | JAN | East Carroll, Richland | 48 min |
| Mar 8, 6:54 PM CST | Tornado Warning | SHV | Grant | 46 min |
| Mar 8, 7:25 PM CST | Tornado Warning | SHV | LaSalle | 50 min |
| Mar 8, 8:14 PM CST | Severe Thunderstorm Warning | JAN | Catahoula | 31 min |
| Mar 8, 8:19 PM CST | Severe Thunderstorm Warning | JAN | Tensas | 51 min |
| Mar 8, 8:56 PM CST | Severe Thunderstorm Warning | JAN | Claiborne | 49 min |
| Mar 8, 9:06 PM CST | Severe Thunderstorm Warning | JAN | Franklin | 49 min |
| Mar 8, 9:27 PM CST | Severe Thunderstorm Warning | JAN | Hinds | 48 min |
| Mar 8, 9:40 PM CST | Severe Thunderstorm Warning | JAN | Copiah, Madison, Rankin | 45 min |
| Mar 8, 9:55 PM CST | Severe Thunderstorm Warning | JAN | Concordia | 50 min |
| Mar 8, 9:55 PM CST | Severe Thunderstorm Warning | JAN | Jefferson | 50 min |
| Mar 8, 10:05 PM CST | Tornado Warning | JAN | Adams | 45 min |
| Mar 8, 10:35 PM CST | Severe Thunderstorm Warning | JAN | Copiah, Lincoln | 50 min |
| Mar 8, 10:41 PM CST | Tornado Warning | LCH | Saint Landry | 29 min |
| Mar 8, 10:56 PM CST | Severe Thunderstorm Warning | LIX | Pointe Coupee | 34 min |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 11.0 hours before the alert went out and 194 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
- 891 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 627 m²/s²
- 0-3 km storm-relative helicity
- 864 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.
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 8, 12:00 PM CST | Tornado Watch | SPC | Bienville, Bossier, Caddo, Claiborne, De Soto, Lincoln and 4 more | 6 hr |
Nearby
Tornado Watches in Louisiana, 1999Tornado Watches in Mississippi, 1999Every tornado watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.