Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 88
The Storm Prediction Center issued this tornado watch at Mar 12, 1999, 10:30 PM CST for 19 parishes in Louisiana; 7 counties in Texas. It was in force for 7 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 12, 1999, 10:30 PM CST (04:30 UTC)
- Expired
- Mar 13, 1999, 5:00 AM CST
- In force
- 7 hr
- Issued by
- the Storm Prediction Center
All 26 counties
Acadia Parish, LA, Allen Parish, LA, Assumption Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Rapides Parish, LA, Sabine Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Vermilion Parish, LA, Vernon Parish, LA, Angelina County, TX, Jasper County, TX, Nacogdoches County, TX, Newton County, TX, Sabine County, TX, San Augustine County, TX, Tyler County, TX
The radar
The Ft Polk radar (KPOE), 38 km from the middle of the area, began a volume at 04:33 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 |
|---|---|---|---|---|
| Mar 12, 10:54 PM CST | Tornado Warning | LCH | Jasper | 61 min |
| Mar 12, 11:43 PM CST | Tornado Warning | LCH | Newton | 62 min |
| Mar 13, 12:25 AM CST | Flash Flood Warning | LCH | Jasper, Newton | 2 hr |
| Mar 13, 12:25 AM CST | Flash Flood Warning | LCH | Tyler | 2 hr |
| Mar 13, 1:01 AM CST | Severe Thunderstorm Warning | LCH | Vernon | 64 min |
| Mar 13, 2:15 AM CST | Flash Flood Warning | LCH | Jasper, Newton | 3 hr |
| Mar 13, 2:15 AM CST | Flash Flood Warning | LCH | Tyler | 3 hr |
| Mar 13, 2:26 AM CST | Tornado Warning | LCH | Tyler | 64 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 4.5 hours before the alert went out and 87 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
- 892 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 549 m above ground
- 0-6 km bulk shear
- 44 kt
- 0-1 km storm-relative helicity
- 213 m²/s²
- 0-3 km storm-relative helicity
- 327 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 9.8
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 |
|---|---|---|---|---|
| Mar 13, 5:00 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more | 5 hr |
| Mar 13, 10:00 AM CST | Tornado Watch | SPC | Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 17 more | 5 hr |
| Mar 13, 4:00 PM CST | Tornado Watch | SPC | Jefferson, Orleans, Plaquemines, Saint Bernard, Saint Tammany, Washington | 5 hr |
| Mar 12, 8:00 PM CST | Tornado Watch | SPC | Aransas, Austin, Bee, Brazoria, Brazos, Calhoun and 35 more | 6 hr |
| Mar 12, 9:00 PM CST | Severe Thunderstorm Watch | SPC | Atascosa, Bandera, Bastrop, Bexar, Blanco, Caldwell and 14 more | 5 hr |
| Mar 13, 2:00 AM CST | Tornado Watch | SPC | Brazoria, Chambers, Fort Bend, Galveston, Hardin, Harris and 8 more | 3 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.