Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 241
The Storm Prediction Center issued this tornado watch at May 10, 1999, 8:30 AM CDT for 15 parishes in Louisiana; 4 counties in Texas. It was in force for 6 hr.
The area
The outline as issued.
The facts
- Issued
- May 10, 1999, 8:30 AM CDT (13:30 UTC)
- Expired
- May 10, 1999, 2:00 PM CDT
- In force
- 6 hr
- Issued by
- the Storm Prediction Center
Counties Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Natchitoches Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Winn Parish, LA, Jasper County, TX, Newton County, TX, Orange County, TX, Sabine County, TX
The radar
The Lake Charles radar (KLCH), 33 km from the middle of the area, began a volume at 13:32 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
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 10, 8:31 AM CDT | Tornado Warning | LCH | Newton | 49 min |
| May 10, 8:35 AM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Vernon | 50 min |
| May 10, 8:35 AM CDT | Severe Thunderstorm Warning | LCH | Calcasieu, Cameron | 50 min |
| May 10, 9:18 AM CDT | Severe Thunderstorm Warning | LCH | Allen, Rapides | 57 min |
| May 10, 9:18 AM CDT | Severe Thunderstorm Warning | LCH | Jefferson Davis | 57 min |
| May 10, 9:27 AM CDT | Severe Thunderstorm Warning | LCH | Beauregard, Calcasieu, Vernon | 48 min |
| May 10, 9:27 AM CDT | Severe Thunderstorm Warning | LCH | Cameron | 48 min |
| May 10, 10:47 AM CDT | Tornado Warning | LCH | Evangeline | 48 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 1.5 hours before the alert went out and 34 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
- 1626 J/kg
- Mixed-layer CIN
- -38 J/kg
- Mixed-layer LCL
- 624 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 129 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 3.8
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 |
|---|---|---|---|---|
| May 10, 7:45 AM CDT | Severe Thunderstorm Watch | SPC | Acadia, Allen, Beauregard, Bienville, Calcasieu, Caldwell and 15 more | 5 hr |
| May 10, 11:45 AM CDT | Severe Thunderstorm Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more | 4 hr |
| May 9, 8:00 PM CDT | Tornado Watch | SPC | Archer, Baylor, Borden, Callahan, Coke, Coleman and 32 more | 4 hr |
| May 9, 10:30 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Bosque, Brown, Burnet, Callahan, Clay and 38 more | 6 hr |
| May 10, 1:15 AM CDT | Severe Thunderstorm Watch | SPC | Anderson, Bell, Blanco, Brazos, Burleson, Ellis and 17 more | 6 hr |
| May 10, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | Archer, Baylor, Brown, Callahan, Clay, Coleman and 15 more | 5 hr |
Nearby
Tornado Watches in Louisiana, 1999Tornado Watches in Texas, 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.