Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 117
The Storm Prediction Center issued this tornado watch at Apr 4, 1999, 6:45 PM CDT for 4 states. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 4, 1999, 6:45 PM CDT (23:45 UTC)
- Expired
- Apr 5, 1999, 12:00 AM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 53 counties
Ashley County, AR, Bradley County, AR, Calhoun County, AR, Chicot County, AR, Columbia County, AR, Drew County, AR, Lafayette County, AR, Miller County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Tensas Parish, LA, Union Parish, LA, Webster Parish, LA, West Carroll Parish, LA, Winn Parish, LA, Jefferson County, MS, Angelina County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX
Warnings issued inside it
10 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 4, 7:04 PM CDT | Severe Thunderstorm Warning | SHV | Harrison | 66 min |
| Apr 4, 7:09 PM CDT | Severe Thunderstorm Warning | SHV | Caddo | 51 min |
| Apr 4, 8:17 PM CDT | Severe Thunderstorm Warning | SHV | Jackson | 43 min |
| Apr 4, 8:18 PM CDT | Flash Flood Warning | SHV | Harrison | 4 hr |
| Apr 4, 8:24 PM CDT | Severe Thunderstorm Warning | SHV | Webster | 46 min |
| Apr 4, 8:27 PM CDT | Flash Flood Warning | SHV | Bossier, Caddo | 3 hr |
| Apr 4, 9:06 PM CDT | Flash Flood Warning | SHV | Columbia | 4 hr |
| Apr 4, 9:28 PM CDT | Flash Flood Warning | SHV | De Soto | 4 hr |
| Apr 4, 9:36 PM CDT | Severe Thunderstorm Warning | SHV | Caddo, De Soto | 49 min |
| Apr 4, 10:56 PM CDT | Severe Thunderstorm Warning | JAN | Morehouse | 29 min |
The nearest sounding before it
Shreveport, LA (KSHV), launched 12:00Z, 11.8 hours before the alert went out and 22 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
- 285 J/kg
- Mixed-layer CIN
- -119 J/kg
- Mixed-layer LCL
- 592 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 90 m²/s²
- 0-3 km storm-relative helicity
- 163 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.9
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 |
|---|---|---|---|---|
| Apr 3, 7:00 PM CST | Severe Thunderstorm Watch | SPC | Crittenden, Mississippi | 5 hr |
| Apr 3, 8:30 PM CST | Severe Thunderstorm Watch | SPC | Avoyelles, Catahoula, Concordia, East Carroll, Franklin, LaSalle and 4 more | 4 hr |
| Apr 4, 3:00 PM CDT | Severe Thunderstorm Watch | SPC | Bienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 14 more | 6 hr |
| Apr 3, 10:15 PM CST | Severe Thunderstorm Watch | SPC | Itawamba, Tishomingo | 4 hr |
Nearby
Tornado Watches in Louisiana, 1999Tornado Watches in Texas, 1999Tornado Watches in Arkansas, 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.