Alert archive / Louisiana / Tornado Watches in 1999

Tornado Watch 23

January 21, 199932 parishes in Louisiana; 12 counties in Mississippi; 25 counties in Texas

The Storm Prediction Center issued this tornado watch at Jan 21, 1999, 8:30 PM CST for 32 parishes in Louisiana; 12 counties in Mississippi; 25 counties in Texas. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Jan 21, 1999, 8:30 PM CST (02:30 UTC)
Expired: Jan 22, 1999, 3:00 AM CST
In force: 7 hr
Issued by: the Storm Prediction Center

All 69 counties

Avoyelles Parish, LA, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Carroll Parish, LA, East Feliciana 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, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Webster Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Issaquena County, MS, Jefferson County, MS, Lincoln County, MS, Warren County, MS, Wilkinson County, MS, Yazoo County, MS, Anderson County, TX, Angelina County, TX, Camp County, TX, Cherokee County, TX, Freestone County, TX, Gregg County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Kaufman County, TX, Leon County, TX, Madison County, TX, Marion County, TX, Nacogdoches County, TX, Panola County, TX, Rains County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Trinity County, TX, Upshur County, TX, Van Zandt County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 35 km from the middle of the area, began a volume at 02:33 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

34 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

Issued	Product	Office	Counties	Lasted
Jan 21, 8:40 PM CST	Tornado Warning	SHV	LaSalle	50 min
Jan 21, 8:43 PM CST	Severe Thunderstorm Warning	FWD	Henderson, Kaufman, Van Zandt	47 min
Jan 21, 8:47 PM CST	Tornado Warning	JAN	Franklin	48 min
Jan 21, 8:55 PM CST	Tornado Warning	JAN	Catahoula	50 min
Jan 21, 9:21 PM CST	Severe Thunderstorm Warning	JAN	East Carroll	49 min
Jan 21, 9:30 PM CST	Tornado Warning	JAN	Franklin	35 min
Jan 21, 9:30 PM CST	Severe Thunderstorm Warning	FWD	Freestone, Limestone	45 min
Jan 21, 9:42 PM CST	Severe Thunderstorm Warning	JAN	Tensas	48 min
Jan 21, 9:49 PM CST	Tornado Warning	JAN	East Carroll	46 min
Jan 21, 9:55 PM CST	Tornado Warning	JAN	Catahoula	50 min
Jan 21, 9:58 PM CST	Tornado Warning	JAN	Issaquena	47 min
Jan 21, 10:00 PM CST	Tornado Warning	JAN	Tensas	50 min
Jan 21, 10:09 PM CST	Tornado Warning	JAN	Madison	51 min
Jan 21, 10:18 PM CST	Severe Thunderstorm Warning	FWD	Leon	42 min
Jan 21, 10:36 PM CST	Tornado Warning	JAN	Franklin	49 min
Jan 21, 10:44 PM CST	Tornado Warning	JAN	Issaquena	36 min
Jan 21, 10:45 PM CST	Severe Thunderstorm Warning	SHV	Smith	65 min
Jan 21, 10:48 PM CST	Tornado Warning	JAN	Warren	32 min
Jan 21, 10:48 PM CST	Severe Thunderstorm Warning	SHV	Upshur	32 min
Jan 21, 10:52 PM CST	Severe Thunderstorm Warning	SHV	Gregg	63 min
Jan 21, 10:57 PM CST	Severe Thunderstorm Warning	SHV	Cherokee	63 min
Jan 21, 11:07 PM CST	Severe Thunderstorm Warning	SHV	Marion	63 min
Jan 21, 11:12 PM CST	Tornado Warning	JAN	Madison	48 min
Jan 21, 11:16 PM CST	Severe Thunderstorm Warning	SHV	Harrison, Rusk	59 min
Jan 21, 11:56 PM CST	Severe Thunderstorm Warning	SHV	Panola	59 min
Jan 22, 12:01 AM CST	Severe Thunderstorm Warning	SHV	Caddo	64 min
Jan 22, 12:09 AM CST	Severe Thunderstorm Warning	SHV	Cherokee	31 min
Jan 22, 12:20 AM CST	Severe Thunderstorm Warning	SHV	Bossier	60 min
Jan 22, 12:38 AM CST	Severe Thunderstorm Warning	SHV	Webster	62 min
Jan 22, 1:35 AM CST	Severe Thunderstorm Warning	FWD	Leon	35 min
Jan 22, 1:38 AM CST	Tornado Warning	SHV	Union	47 min
Jan 22, 1:49 AM CST	Severe Thunderstorm Warning	SHV	Claiborne	46 min
Jan 22, 2:08 AM CST	Severe Thunderstorm Warning	FWD	Leon	37 min
Jan 22, 2:16 AM CST	Severe Thunderstorm Warning	SHV	Cherokee	49 min

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.5 hours before the alert went out and 42 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 959 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 204 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 1.1
Supercell composite: 7.9

Open this sounding in Storm Lab

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
Jan 22, 3:00 AM CST	Tornado Watch	SPC	Allen, Avoyelles, Beauregard, Bienville, Bossier, Caddo and 29 more	6 hr
Jan 22, 9:45 AM CST	Tornado Watch	SPC	Acadia, Allen, Ascension, Assumption, Avoyelles, Beauregard and 36 more	6 hr
Jan 22, 3:00 PM CST	Tornado Watch	SPC	Ascension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 19 more	6 hr
Jan 21, 9:00 PM CST	Tornado Watch	SPC	Bolivar, Coahoma, DeSoto, Humphreys, Leflore, Marshall and 7 more	6 hr
Jan 22, 3:00 AM CST	Tornado Watch	SPC	Alcorn, Benton, Bolivar, Calhoun, Carroll, Coahoma and 22 more	6 hr
Jan 22, 9:00 AM CST	Tornado Watch	SPC	Alcorn, Amite, Attala, Benton, Bolivar, Calhoun and 69 more	6 hr
Jan 22, 12:45 PM CST	Tornado Watch	SPC	Tishomingo	6 hr
Jan 22, 2:15 PM CST	Tornado Watch	SPC	Adams, Amite, Attala, Carroll, Choctaw, Claiborne and 45 more	6 hr

Nearby

Tornado Watches in Louisiana, 1999 Tornado Watches in Texas, 1999 Tornado Watches in Mississippi, 1999 Every 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.