Alert archive / Louisiana / Tornado Watches in 1999
Tornado Watch 91
The Storm Prediction Center issued this tornado watch at Mar 13, 1999, 10:00 AM CST for 8 counties in Alabama; 23 parishes in Louisiana; 20 counties in Mississippi. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Mar 13, 1999, 10:00 AM CST (16:00 UTC)
- Expired
- Mar 13, 1999, 3:00 PM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 51 counties
Baldwin County, AL, Butler County, AL, Clarke County, AL, Conecuh County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Ascension Parish, LA, Assumption Parish, LA, East Baton Rouge Parish, LA, East Feliciana Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Parish, LA, Lafourche Parish, LA, Livingston Parish, LA, Orleans Parish, LA, Plaquemines Parish, LA, Saint Bernard Parish, LA, Saint Charles Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, Amite County, MS, Covington County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jefferson Davis County, MS, Jones County, MS, Lamar County, MS, Lawrence County, MS, Lincoln County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Pike County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS
Warnings issued inside it
18 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 13, 10:07 AM CST | Severe Thunderstorm Warning | LIX | East Baton Rouge, East Feliciana | 48 min |
| Mar 13, 10:13 AM CST | Tornado Warning | LIX | Amite | 37 min |
| Mar 13, 10:23 AM CST | Severe Thunderstorm Warning | LIX | Saint Helena | 42 min |
| Mar 13, 11:01 AM CST | Severe Thunderstorm Warning | LIX | Tangipahoa | 34 min |
| Mar 13, 11:31 AM CST | Severe Thunderstorm Warning | LIX | Pike | 34 min |
| Mar 13, 11:37 AM CST | Severe Thunderstorm Warning | LIX | Walthall | 33 min |
| Mar 13, 11:45 AM CST | Severe Thunderstorm Warning | JAN | Marion | 50 min |
| Mar 13, 12:20 PM CST | Severe Thunderstorm Warning | JAN | Lamar | 50 min |
| Mar 13, 12:22 PM CST | Flash Flood Warning | LIX | Pike | 2 hr |
| Mar 13, 12:34 PM CST | Tornado Warning | LCH | Saint Martin | 46 min |
| Mar 13, 1:07 PM CST | Tornado Warning | LIX | Tangipahoa | 33 min |
| Mar 13, 1:30 PM CST | Flash Flood Warning | JAN | Lamar, Marion | 2 hr |
| Mar 13, 1:30 PM CST | Flash Flood Warning | JAN | Forrest | 2 hr |
| Mar 13, 1:33 PM CST | Tornado Warning | LIX | Washington | 32 min |
| Mar 13, 2:01 PM CST | Flash Flood Warning | JAN | Jones | 119 min |
| Mar 13, 2:16 PM CST | Flash Flood Warning | LIX | Pike | 74 min |
| Mar 13, 2:43 PM CST | Severe Thunderstorm Warning | MOB | Wayne | 62 min |
| Mar 13, 2:55 PM CST | Severe Thunderstorm Warning | MOB | Washington | 65 min |
The nearest sounding before it
Slidell Radar S, LA (KSIL), launched 12:00Z, 4.0 hours before the alert went out and 65 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
- 553 J/kg
- Mixed-layer CIN
- -85 J/kg
- Mixed-layer LCL
- 514 m above ground
- 0-6 km bulk shear
- 47 kt
- 0-1 km storm-relative helicity
- 406 m²/s²
- 0-3 km storm-relative helicity
- 553 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 5.6
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, 4:00 PM CST | Tornado Watch | SPC | Baldwin, Mobile | 5 hr |
| Mar 12, 10:30 PM CST | Tornado Watch | SPC | Acadia, Allen, Assumption, Beauregard, Calcasieu, Cameron and 13 more | 7 hr |
| Mar 13, 5:00 AM CST | Tornado Watch | SPC | Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 26 more | 5 hr |
Nearby
Tornado Watches in Louisiana, 1999Tornado Watches in Mississippi, 1999Tornado Watches in Alabama, 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.