Alert archive / Louisiana / Tornado Watches in 2019

Tornado Watch 700

December 16, 20194 states

The Storm Prediction Center issued this tornado watch at Dec 16, 2019, 10:40 AM CST for 4 states. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued: Dec 16, 2019, 10:40 AM CST (16:40 UTC)
Expired: Dec 16, 2019, 8:00 PM CST
In force: 9 hr
Issued by: the Storm Prediction Center
Largest hail expected: 1.5 in
Strongest gust expected: 65 kt

All 85 counties

Ashley County, AR, Chicot County, AR, Union County, AR, Acadia Parish, LA, Allen Parish, LA, Avoyelles Parish, LA, Beauregard Parish, LA, Bienville Parish, LA, Calcasieu Parish, LA, Caldwell Parish, LA, Cameron Parish, LA, Catahoula Parish, LA, Claiborne Parish, LA, Concordia Parish, LA, De Soto Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Grant Parish, LA, Jackson Parish, LA, Jefferson Davis Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Livingston Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Red River Parish, LA, Richland Parish, LA, Sabine Parish, LA, Saint Helena Parish, LA, Saint Landry Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Union Parish, LA, Vernon Parish, LA, Washington Parish, LA, Webster Parish, LA, West Baton Rouge Parish, LA, West Carroll Parish, LA, West Feliciana Parish, LA, Winn Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Lawrence County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Montgomery County, MS, Pike County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Wilkinson County, MS, Yazoo County, MS, Hardin County, TX, Jasper County, TX, Jefferson County, TX, Newton County, TX, Orange County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Tyler County, TX

The radar

The Ft Polk radar (KPOE), 66 km from the middle of the area, began a volume at 16:41 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.

What SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes: 80%
One or more EF2 to EF5 tornadoes: 60%
Ten or more severe wind reports: 80%
One or more gusts of 65 knots or more: 40%
Ten or more severe hail reports: 30%
One or more hailstones of 2 inches or more: 20%
Six or more combined severe hail and wind reports: 95%

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Dec 16, 10:42 AM CST	Tornado Warning	LCH	Jasper, Newton, Orange	31 min
Dec 16, 10:50 AM CST	Severe Thunderstorm Warning	JAN	Madison, Tensas	55 min
Dec 16, 10:50 AM CST	Severe Thunderstorm Warning	LCH	Jasper, Newton	38 min
Dec 16, 10:53 AM CST	Tornado Warning	JAN	Madison, Tensas	67 min
Dec 16, 10:57 AM CST	Tornado Warning	SHV	Claiborne	33 min
Dec 16, 11:00 AM CST	Tornado Warning	LCH	Beauregard, Vernon	30 min
Dec 16, 11:07 AM CST	Severe Thunderstorm Warning	SHV	Webster	24 min
Dec 16, 11:20 AM CST	Severe Thunderstorm Warning	SHV	Union	55 min
Dec 16, 11:25 AM CST	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union, Webster	65 min
Dec 16, 11:25 AM CST	Severe Thunderstorm Warning	SHV	Winn	65 min
Dec 16, 11:26 AM CST	Tornado Warning Tornado observed	LCH	Vernon	34 min
Dec 16, 11:40 AM CST	Tornado Warning	SHV	Winn	51 min
Dec 16, 11:44 AM CST	Tornado Warning	LCH	Beauregard	31 min
Dec 16, 11:49 AM CST	Severe Thunderstorm Warning	SHV	Sabine	56 min
Dec 16, 11:49 AM CST	Tornado Warning	JAN	Hinds, Warren	56 min
Dec 16, 11:53 AM CST	Tornado Warning Considerable damage threat	LCH	Rapides, Vernon	37 min
Dec 16, 12:00 PM CST	Tornado Warning	SHV	Sabine	25 min
Dec 16, 12:08 PM CST	Severe Thunderstorm Warning	JAN	Ashley	67 min
Dec 16, 12:13 PM CST	Tornado Warning	LCH	Beauregard, Vernon	32 min
Dec 16, 12:18 PM CST	Tornado Warning	LCH	Avoyelles, Evangeline, Saint Landry	27 min
Dec 16, 12:19 PM CST	Tornado Warning	SHV	Union	25 min
Dec 16, 12:20 PM CST	Tornado Warning	LCH	Acadia, Saint Landry	40 min
Dec 16, 12:26 PM CST	Tornado Warning Considerable damage threat	LCH	Rapides	34 min
Dec 16, 12:32 PM CST	Severe Thunderstorm Warning	JAN	Madison, Yazoo	29 min
Dec 16, 12:38 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Claiborne, Jackson, Lincoln, Red River	42 min
Dec 16, 12:41 PM CST	Tornado Warning EmergencyTornado observedCatastrophic damage threat	LCH	Rapides	34 min
Dec 16, 12:43 PM CST	Tornado Warning	LCH	Avoyelles, Saint Landry	47 min
Dec 16, 12:49 PM CST	Severe Thunderstorm Warning	SHV	Jackson, Natchitoches, Sabine, Winn	39 min
Dec 16, 12:53 PM CST	Severe Thunderstorm Warning	JAN	Ashley	52 min
Dec 16, 12:55 PM CST	Tornado Warning	LCH	Evangeline, Saint Landry	35 min
Dec 16, 1:02 PM CST	Severe Thunderstorm Warning	JAN	Chicot	54 min
Dec 16, 1:10 PM CST	Tornado Warning	LCH	Avoyelles, Saint Landry	23 min
Dec 16, 1:11 PM CST	Severe Thunderstorm Warning	SHV	Natchitoches, Sabine	49 min
Dec 16, 1:15 PM CST	Severe Thunderstorm Warning	SHV	Grant, LaSalle	45 min
Dec 16, 1:17 PM CST	Severe Thunderstorm Warning	SHV	Jackson, Lincoln, Ouachita, Union	58 min
Dec 16, 1:20 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles	25 min
Dec 16, 1:21 PM CST	Tornado Warning	LCH	Avoyelles, Saint Landry	24 min
Dec 16, 1:21 PM CST	Severe Thunderstorm Warning	LIX	Pointe Coupee, West Feliciana	39 min
Dec 16, 1:27 PM CST	Severe Thunderstorm Warning	JAN	Concordia	48 min
Dec 16, 1:29 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	61 min
Dec 16, 1:33 PM CST	Tornado Warning	LIX	Pointe Coupee, West Feliciana	27 min
Dec 16, 1:35 PM CST	Tornado Warning	SHV	Ouachita, Union	40 min
Dec 16, 1:36 PM CST	Severe Thunderstorm Warning	LCH	Rapides	28 min
Dec 16, 1:41 PM CST	Tornado Warning	JAN	Concordia	49 min
Dec 16, 1:43 PM CST	Tornado Warning	LIX	Wilkinson	32 min
Dec 16, 1:47 PM CST	Tornado Warning	LCH	Avoyelles	28 min
Dec 16, 1:47 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	28 min
Dec 16, 1:52 PM CST	Tornado Warning	JAN	Morehouse, West Carroll	53 min
Dec 16, 1:52 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles, Rapides	10 min
Dec 16, 1:58 PM CST	Severe Thunderstorm Warning	LIX	West Feliciana	47 min
Dec 16, 2:08 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles	52 min
Dec 16, 2:09 PM CST	Severe Thunderstorm Warning	LIX	Amite, Wilkinson	51 min
Dec 16, 2:12 PM CST	Tornado Warning	LIX	Wilkinson	18 min
Dec 16, 2:13 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	41 min
Dec 16, 2:14 PM CST	Severe Thunderstorm Warning	SHV	LaSalle	31 min
Dec 16, 2:18 PM CST	Tornado Warning	JAN	Adams, Franklin	45 min
Dec 16, 2:20 PM CST	Severe Thunderstorm Warning	JAN	Tensas	17 min
Dec 16, 2:20 PM CST	Tornado Warning	LIX	Amite	25 min
Dec 16, 2:30 PM CST	Severe Thunderstorm Warning	JAN	Carroll, Grenada, Leflore, Montgomery	75 min
Dec 16, 2:31 PM CST	Flash Flood Warning	LCH	Jefferson	119 min
Dec 16, 2:32 PM CST	Severe Thunderstorm Warning	JAN	Chicot	58 min
Dec 16, 2:45 PM CST	Tornado Warning Tornado observed	LIX	Amite	30 min
Dec 16, 2:50 PM CST	Tornado Warning Tornado observed	JAN	Franklin, Lincoln	55 min
Dec 16, 2:52 PM CST	Tornado Warning	LIX	Amite, Wilkinson	23 min
Dec 16, 3:14 PM CST	Tornado Warning	LIX	Amite	16 min
Dec 16, 3:21 PM CST	Severe Thunderstorm Warning	LIX	Tangipahoa	24 min
Dec 16, 3:24 PM CST	Tornado Warning	LCH	Acadia, Saint Landry	18 min
Dec 16, 3:24 PM CST	Severe Thunderstorm Warning	JAN	Franklin, Lincoln	51 min
Dec 16, 3:25 PM CST	Severe Thunderstorm Warning	JAN	Holmes, Humphreys, Leflore, Sharkey, Sunflower, Washington	43 min
Dec 16, 3:27 PM CST	Tornado Warning	JAN	Copiah, Lawrence, Lincoln	63 min
Dec 16, 3:32 PM CST	Tornado Warning	LIX	Amite, Pike	13 min
Dec 16, 3:37 PM CST	Tornado Warning	LIX	Tangipahoa, Washington	23 min
Dec 16, 3:38 PM CST	Tornado Warning	JAN	Lincoln	52 min
Dec 16, 3:40 PM CST	Tornado Warning	LIX	Amite, Pike	35 min
Dec 16, 3:42 PM CST	Severe Thunderstorm Warning	LCH	Avoyelles	33 min
Dec 16, 3:43 PM CST	Severe Thunderstorm Warning	LIX	Amite	17 min
Dec 16, 3:54 PM CST	Severe Thunderstorm Warning	JAN	Catahoula, Concordia	51 min
Dec 16, 3:57 PM CST	Severe Thunderstorm Warning	LIX	Washington	33 min
Dec 16, 4:00 PM CST	Severe Thunderstorm Warning	LIX	Amite	30 min
Dec 16, 4:08 PM CST	Tornado Warning	LIX	Washington	26 min
Dec 16, 4:12 PM CST	Severe Thunderstorm Warning	LIX	East Feliciana, West Feliciana	33 min
Dec 16, 4:14 PM CST	Tornado Warning	JAN	Jefferson Davis, Lawrence	61 min
Dec 16, 4:22 PM CST	Severe Thunderstorm Warning	JAN	Simpson	38 min
Dec 16, 4:37 PM CST	Tornado Warning	JAN	Simpson	53 min
Dec 16, 4:40 PM CST	Tornado Warning	LIX	Amite	35 min
Dec 16, 4:55 PM CST	Severe Thunderstorm Warning	JAN	Adams, Franklin	48 min
Dec 16, 4:57 PM CST	Severe Thunderstorm Warning	JAN	Claiborne, Franklin, Jefferson	44 min
Dec 16, 5:03 PM CST	Tornado Warning Tornado observedConsiderable damage threat	JAN	Covington, Jefferson Davis, Simpson, Smith	57 min
Dec 16, 5:11 PM CST	Tornado Warning	LIX	Amite, Pike	23 min
Dec 16, 5:12 PM CST	Tornado Warning	JAN	Covington, Jefferson Davis, Simpson, Smith	42 min
Dec 16, 5:24 PM CST	Tornado Warning	JAN	Lawrence, Lincoln	66 min
Dec 16, 5:30 PM CST	Severe Thunderstorm Warning	JAN	Copiah, Hinds, Lincoln	45 min
Dec 16, 6:39 PM CST	Tornado Warning	JAN	Covington, Simpson, Smith	66 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 4.7 hours before the alert went out and 169 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: 1108 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 720 m above ground
0-6 km bulk shear: 57 kt
0-1 km storm-relative helicity: 319 m²/s²
0-3 km storm-relative helicity: 322 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 7.4

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 16, 4:24 AM CST	Mesoscale Discussion	SPC	Benton, Carroll	6 hr
Dec 16, 9:43 AM CST	Mesoscale Discussion	SPC	Ashley, Chicot	3 hr
Dec 16, 10:02 AM CST	Mesoscale Discussion	SPC	Arkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 19 more	118 min
Dec 16, 11:24 AM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Beauregard, Catahoula, Evangeline, Grant and 3 more	96 min
Dec 16, 1:16 PM CST	Mesoscale Discussion	SPC	Allen, Avoyelles, Catahoula, Concordia, Evangeline, LaSalle and 4 more	89 min
Dec 16, 1:31 PM CST	Mesoscale Discussion	SPC	Beauregard, Bienville, Calcasieu, Grant, Jackson, Lincoln and 8 more	119 min
Dec 16, 1:52 PM CST	Mesoscale Discussion	SPC	Alcorn, Attala, Benton, Calhoun, Carroll, Chickasaw and 22 more	83 min
Dec 16, 2:22 PM CST	Tornado Watch	SPC	Alcorn, Calhoun, Chickasaw, Choctaw, Clarke, Clay and 30 more	8 hr
Dec 16, 3:08 PM CST	Mesoscale Discussion	SPC	Amite, Copiah, Franklin, Jefferson Davis, Lawrence, Lincoln and 3 more	67 min
Dec 16, 3:10 PM CST	Mesoscale Discussion	SPC	Alcorn, Attala, Calhoun, Chickasaw, Choctaw, Clay and 16 more	65 min
Dec 16, 3:47 PM CST	Tornado Watch	SPC	Greene, Perry, Wayne	10 hr
Dec 16, 4:32 PM CST	Mesoscale Discussion	SPC	Covington, Jasper, Jefferson Davis, Jones, Lawrence, Marion and 1 more	88 min
Dec 16, 4:45 PM CST	Mesoscale Discussion	SPC	Itawamba, Monroe, Tishomingo	60 min

Nearby

Tornado Watches in Louisiana, 2019 Tornado Watches in Mississippi, 2019 Tornado Watches in Texas, 2019 Every tornado watch in 2019

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.