Alert archive / Louisiana / Tornado Watches in 2014

Tornado Watch 551

November 16, 2014Mobile County, Washington County, Alabama; 15 parishes in Louisiana; 15 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 16, 2014, 9:49 PM CST for Mobile County, Washington County, Alabama; 15 parishes in Louisiana; 15 counties in Mississippi. It was in force for 7 hr.

The area

The outline as issued.

The facts

Issued: Nov 16, 2014, 9:49 PM CST (03:49 UTC)
Expired: Nov 17, 2014, 5:00 AM CST
In force: 7 hr
Issued by: the Storm Prediction Center
Largest hail expected: 0.5 in
Strongest gust expected: 60 kt

All 32 counties

Mobile County, AL, Washington County, AL, Ascension Parish, LA, Assumption 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 James Parish, LA, Saint John the Baptist Parish, LA, Saint Tammany Parish, LA, Tangipahoa Parish, LA, Terrebonne Parish, LA, Washington Parish, LA, Clarke County, MS, Forrest County, MS, George County, MS, Greene County, MS, Hancock County, MS, Harrison County, MS, Jackson County, MS, Jones County, MS, Lamar County, MS, Marion County, MS, Pearl River County, MS, Perry County, MS, Stone County, MS, Walthall County, MS, Wayne County, MS

What SPC expected

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

Two or more tornadoes: 40%
One or more EF2 to EF5 tornadoes: 20%
Ten or more severe wind reports: 30%
One or more gusts of 65 knots or more: 10%
Ten or more severe hail reports: 10%
One or more hailstones of 2 inches or more: 5%
Six or more combined severe hail and wind reports: 60%

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
Nov 16, 9:58 PM CST	Tornado Warning	LIX	Livingston, Tangipahoa	32 min
Nov 16, 10:16 PM CST	Severe Thunderstorm Warning	JAN	Jones	34 min
Nov 16, 10:28 PM CST	Tornado Warning	JAN	Clarke, Jasper, Jones	47 min
Nov 16, 10:31 PM CST	Severe Thunderstorm Warning	JAN	Lamar, Marion	59 min
Nov 16, 10:33 PM CST	Tornado Warning	MOB	Wayne	42 min
Nov 16, 10:50 PM CST	Severe Thunderstorm Warning	LIX	Pearl River	55 min
Nov 16, 11:10 PM CST	Severe Thunderstorm Warning	JAN	Forrest	50 min
Nov 16, 11:14 PM CST	Severe Thunderstorm Warning	JAN	Covington, Jasper, Jones	30 min
Nov 16, 11:41 PM CST	Severe Thunderstorm Warning	LIX	Assumption, Lafourche, Saint Charles, Saint James, Saint John the Baptist	64 min
Nov 16, 11:52 PM CST	Tornado Warning	MOB	Greene, Perry	22 min
Nov 17, 1:29 AM CST	Severe Thunderstorm Warning	MOB	Clarke, Washington	61 min
Nov 17, 1:41 AM CST	Tornado Warning	MOB	Clarke, Washington	49 min
Nov 17, 2:09 AM CST	Severe Thunderstorm Warning	MOB	Baldwin, Clarke, Conecuh, Escambia, Monroe, Washington	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

Slidell Radar S, LA (KSIL), launched 00:00Z, 3.8 hours before the alert went out and 22 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: 496 J/kg
Mixed-layer CIN: -36 J/kg
Mixed-layer LCL: 825 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 295 m²/s²
0-3 km storm-relative helicity: 414 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.3

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Nov 16, 8:43 PM CST	Mesoscale Discussion	SPC	Washington	62 min
Nov 16, 11:50 PM CST	Mesoscale Discussion	SPC	Choctaw, Clarke, Escambia, Monroe, Washington	55 min
Nov 17, 1:13 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Butler, Coffee, Conecuh, Covington and 8 more	32 min
Nov 17, 1:32 AM CST	Tornado Watch	SPC	Baldwin, Barbour, Bullock, Butler, Clarke, Coffee and 11 more	7 hr
Nov 17, 2:21 AM CST	Mesoscale Discussion	SPC	Mobile, Washington	114 min
Nov 17, 4:39 AM CST	Mesoscale Discussion	SPC	Baldwin, Barbour, Bullock, Butler, Coffee, Conecuh and 9 more	66 min
Nov 17, 7:43 AM CST	Mesoscale Discussion	SPC	Barbour, Dale, Geneva, Henry, Houston	92 min

Nearby

Tornado Watches in Louisiana, 2014 Tornado Watches in Mississippi, 2014 Tornado Watches in Alabama, 2014 Every tornado watch in 2014

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.