Alert archive / Mississippi / Tornado Watches in 2016

Tornado Watch 508

November 29, 201613 counties in Alabama; 33 parishes in Louisiana; 53 counties in Mississippi

The Storm Prediction Center issued this tornado watch at Nov 29, 2016, 8:50 PM CST for 13 counties in Alabama; 33 parishes in Louisiana; 53 counties in Mississippi. It was in force for 8 hr.

The area

The outline as issued.

The facts

Issued
Nov 29, 2016, 8:50 PM CST (02:50 UTC)
Expired
Nov 30, 2016, 4:59 AM CST
In force
8 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 99 counties

Bibb County, AL, Blount County, AL, Fayette County, AL, Greene County, AL, Hale County, AL, Jefferson County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL, Acadia Parish, LA, Allen Parish, LA, Ascension Parish, LA, Assumption Parish, LA, Avoyelles Parish, LA, Catahoula Parish, LA, Concordia Parish, LA, East Baton Rouge Parish, LA, East Carroll Parish, LA, East Feliciana Parish, LA, Evangeline Parish, LA, Franklin Parish, LA, Iberia Parish, LA, Iberville Parish, LA, Jefferson Davis Parish, LA, Lafayette Parish, LA, Livingston Parish, LA, Madison Parish, LA, Pointe Coupee Parish, LA, Rapides Parish, LA, Saint Helena Parish, LA, Saint James Parish, LA, Saint John the Baptist Parish, LA, Saint Landry Parish, LA, Saint Martin Parish, LA, Saint Tammany Parish, LA, St. Mary Parish, LA, Tangipahoa Parish, LA, Tensas Parish, LA, Vermilion Parish, LA, Washington Parish, LA, West Baton Rouge Parish, LA, West Feliciana Parish, LA, Adams County, MS, Amite County, MS, Attala County, MS, Carroll County, MS, Chickasaw County, MS, Choctaw County, MS, Claiborne County, MS, Clarke County, MS, Clay County, MS, Copiah County, MS, Covington County, MS, Forrest County, MS, Franklin County, MS, Grenada County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jasper County, MS, Jefferson County, MS, Jefferson Davis County, MS, Jones County, MS, Kemper County, MS, Lamar County, MS, Lauderdale County, MS, Lawrence County, MS, Leake County, MS, Leflore County, MS, Lincoln County, MS, Lowndes County, MS, Madison County, MS, Marion County, MS, Monroe County, MS, Montgomery County, MS, Neshoba County, MS, Newton County, MS, Noxubee County, MS, Oktibbeha County, MS, Pearl River County, MS, Pike County, MS, Rankin County, MS, Scott County, MS, Sharkey County, MS, Simpson County, MS, Smith County, MS, Sunflower County, MS, Walthall County, MS, Warren County, MS, Washington County, MS, Webster County, MS, Wilkinson County, MS, Winston County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 116 km from the middle of the area, began a volume at 02:52 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
60%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
60%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
80%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Nov 29, 9:13 PM CSTTornado WarningJANAttala47 min
Nov 29, 9:14 PM CSTTornado WarningJANMadison61 min
Nov 29, 9:38 PM CSTSevere Thunderstorm WarningJANCatahoula, Franklin67 min
Nov 29, 9:49 PM CSTSevere Thunderstorm WarningJANChoctaw41 min
Nov 29, 9:55 PM CSTTornado WarningJANTensas41 min
Nov 29, 9:58 PM CSTSevere Thunderstorm WarningLCHAllen, Beauregard38 min
Nov 29, 9:58 PM CSTSevere Thunderstorm WarningJANHolmes, Humphreys47 min
Nov 29, 10:02 PM CSTSevere Thunderstorm WarningJANYazoo39 min
Nov 29, 10:13 PM CSTTornado WarningBMXWinston17 min
Nov 29, 10:33 PM CSTSevere Thunderstorm WarningJANCarroll, Montgomery19 min
Nov 29, 10:54 PM CSTSevere Thunderstorm WarningJANClay21 min
Nov 29, 10:56 PM CSTSevere Thunderstorm WarningJANLeake, Neshoba49 min
Nov 29, 11:34 PM CSTSevere Thunderstorm WarningLCHAvoyelles, Evangeline, Rapides38 min
Nov 29, 11:35 PM CSTTornado WarningBMXFayette, Lamar, Marion55 min
Nov 29, 11:35 PM CSTTornado WarningJANNeshoba, Winston40 min
Nov 29, 11:45 PM CSTSevere Thunderstorm WarningJANHinds60 min
Nov 30, 12:00 AM CSTSevere Thunderstorm WarningJANLeake, Madison, Rankin, Scott26 min
Nov 30, 12:09 AM CSTTornado WarningJANLowndes, Noxubee, Winston51 min
Nov 30, 12:34 AM CSTTornado WarningBMXWinston24 min
Nov 30, 12:43 AM CSTSevere Thunderstorm WarningJANCopiah19 min
Nov 30, 12:53 AM CSTTornado WarningJANLowndes, Noxubee10 min
Nov 30, 12:57 AM CSTSevere Thunderstorm WarningLCHAvoyelles26 min
Nov 30, 1:27 AM CSTSevere Thunderstorm WarningLIXWilkinson33 min
Nov 30, 1:37 AM CSTSevere Thunderstorm WarningJANAdams, Franklin53 min
Nov 30, 1:37 AM CSTFlash Flood WarningMEGMonroe3 hr
Nov 30, 2:33 AM CSTTornado WarningBMXWalker, Winston27 min
Nov 30, 2:46 AM CSTSevere Thunderstorm WarningLCHAcadia, Lafayette, Saint Landry, Saint Martin, Vermilion44 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

Jackson, MS (KJAN), launched 00:00Z, 2.8 hours before the alert went out and 112 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-pSkew-T log-p diagram, Jackson, MS at 00:00Z on 2016-11-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1191 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2016-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 391 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
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
1191 J/kg
Mixed-layer CIN
-13 J/kg
Mixed-layer LCL
883 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
391 m²/s²
0-3 km storm-relative helicity
488 m²/s²
Significant tornado parameter
3.5
Supercell composite
15.4

Open this sounding in Storm Lab

The text

As transmitted.

269 
WWUS20 KWNS 300247
SEL8  
SPC WW 300247
ALZ000-LAZ000-MSZ000-CWZ000-301100-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 508
NWS STORM PREDICTION CENTER NORMAN OK
850 PM CST TUE NOV 29 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  WEST CENTRAL ALABAMA
  SOUTHERN AND EASTERN LOUISIANA
  CENTRAL AND SOUTHERN MISSISSIPPI
  COASTAL WATERS

* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 850 PM
  UNTIL 500 AM CST.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES LIKELY WITH A COUPLE INTENSE TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...NUMEROUS THUNDERSTORMS ARE FORECAST TO INTENSIFY THIS
EVENING AND OVERNIGHT OVER PARTS OF LA AND MS...MOVING INTO AL.  VERY
STRONG WINDS ALOFT WILL POSE A RISK OF DAMAGING WIND GUSTS AND A FEW
TORNADOES.  A STRONG TORNADO OR TWO IS POSSIBLE.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 80 STATUTE MILES
EAST AND WEST OF A LINE FROM 15 MILES SOUTH OF LAFAYETTE LA TO 30
MILES NORTH NORTHWEST OF COLUMBUS MS. FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU8).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH
AREA. PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR
THREATENING WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS
AND POSSIBLE WARNINGS.

&&

OTHER WATCH INFORMATION...CONTINUE...WW 504...WW 505...WW
506...WW 507...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN
STORM MOTION VECTOR 25035.

...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 29, 6:43 PM CSTMesoscale DiscussionSPCColbert, Fayette, Franklin, Lamar, Lauderdale, Lawrence and 6 more92 min
Nov 29, 6:47 PM CSTTornado WatchSPCCullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more8 hr
Nov 29, 8:03 PM CSTMesoscale DiscussionSPCChoctaw, Fayette, Greene, Hale, Lamar, Pickens and 2 more2 hr
Nov 29, 9:28 PM CSTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more62 min
Nov 29, 10:28 PM CSTTornado WatchSPCColbert, Cullman, DeKalb, Franklin, Jackson, Lauderdale and 5 more5 hr
Nov 29, 11:17 PM CSTMesoscale DiscussionSPCDeKalb, Jackson, Lawrence, Limestone, Madison, Morgan118 min
Nov 29, 11:37 PM CSTMesoscale DiscussionSPCFayette, Lamar, Pickens113 min
Nov 30, 1:07 AM CSTMesoscale DiscussionSPCBlount, Cullman, DeKalb, Fayette, Jackson, Madison and 5 more53 min
Nov 30, 2:54 AM CSTTornado WatchSPCBibb, Blount, Calhoun, Cherokee, Chilton, Cleburne and 22 more7 hr
Nov 30, 4:57 AM CSTTornado WatchSPCChoctaw, Clarke, Mobile, Washington7 hr
Nov 30, 5:10 AM CSTMesoscale DiscussionSPCBibb, Blount, Calhoun, Cherokee, Chilton, Clay and 27 more95 min
Nov 30, 9:00 AM CSTMesoscale DiscussionSPCAutauga, Baldwin, Bibb, Blount, Bullock, Butler and 37 more2 hr
Nov 30, 11:06 AM CSTTornado WatchSPCBaldwin, Barbour, Bullock, Butler, Chambers, Coffee and 17 more6 hr
Nov 30, 12:59 PM CSTMesoscale DiscussionSPCBarbour, Bullock, Coffee, Covington, Crenshaw, Dale and 7 more2 hr
Nov 30, 1:55 PM CSTMesoscale DiscussionSPCBarbour, Coffee, Covington, Dale, Geneva, Henry and 2 more2 hr
Nov 29, 6:06 PM CSTMesoscale DiscussionSPCCaldwell, Catahoula, Concordia, East Carroll, Franklin, Grant and 6 more114 min
Nov 29, 9:47 PM CSTMesoscale DiscussionSPCConcordia58 min
Nov 30, 3:33 AM CSTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberia, Iberville and 14 more87 min

Nearby

Tornado Watches in Mississippi, 2016Tornado Watches in Louisiana, 2016Tornado Watches in Alabama, 2016Every tornado watch in 2016

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.