Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 90
The Storm Prediction Center issued this tornado watch at Mar 13, 1999, 5:00 AM CST for 32 parishes in Louisiana; 13 counties in Mississippi; Jefferson County, Orange County, Texas. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 1999, 5:00 AM CST (11:00 UTC)
- Expired
- Mar 13, 1999, 10:00 AM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 47 counties
Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Grant Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, LaSalle Parish, LA, Livingston Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Covington County, MS, Franklin County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pike County, MS, Walthall County, MS, Wilkinson County, MS, Jefferson County, TX, Orange County, TX
The radar
The Lake Charles radar (KLCH), 87 km from the middle of the area, began a volume at 11:01 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
13 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 5:34 AM CST | Severe Thunderstorm Warning | SHV | Grant | 51 min |
| Mar 13, 6:05 AM CST | Severe Thunderstorm Warning | SHV | LaSalle | 50 min |
| Mar 13, 6:23 AM CST | Severe Thunderstorm Warning | JAN | Catahoula | 47 min |
| Mar 13, 6:54 AM CST | Severe Thunderstorm Warning | JAN | Concordia | 36 min |
| Mar 13, 7:11 AM CST | Severe Thunderstorm Warning | JAN | Adams, Jefferson | 49 min |
| Mar 13, 7:39 AM CST | Severe Thunderstorm Warning | JAN | Franklin | 46 min |
| Mar 13, 8:02 AM CST | Tornado Warning | LCH | Evangeline | 63 min |
| Mar 13, 8:22 AM CST | Tornado Warning | LCH | Saint Landry | 33 min |
| Mar 13, 8:29 AM CST | Severe Thunderstorm Warning | LIX | Pointe Coupee | 46 min |
| Mar 13, 8:50 AM CST | Tornado Warning | LIX | Pointe Coupee | 30 min |
| Mar 13, 9:00 AM CST | Severe Thunderstorm Warning | LIX | West Feliciana | 35 min |
| Mar 13, 9:38 AM CST | Severe Thunderstorm Warning | LIX | East Feliciana, West Feliciana | 32 min |
| Mar 13, 9:58 AM CST | Severe Thunderstorm Warning | LIX | Amite | 47 min |
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 00:00Z, 11.0 hours before the alert went out and 86 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 12, 10:30 PM CST | Tornado Watch | SPC | Acadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 13 more | 7 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 Mississippi, 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.