Alert archive / Alabama / Tornado Watches in 2016

Tornado Watch 506

November 29, 201610 counties in Alabama

The Storm Prediction Center issued this tornado watch at Nov 29, 2016, 5:37 PM CST for 10 counties in Alabama. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Nov 29, 2016, 5:37 PM CST (23:37 UTC)
Expired
Nov 29, 2016, 8:50 PM CST
In force
3 hr
Issued by
the Storm Prediction Center
Largest hail expected
2 in
Strongest gust expected
60 kt

Counties Fayette County, AL, Greene County, AL, Hale County, AL, Lamar County, AL, Marion County, AL, Pickens County, AL, Sumter County, AL, Tuscaloosa County, AL, Walker County, AL, Winston County, AL

The radar

The Columbus AFB radar (KGWX), 77 km from the middle of the area, began a volume at 23:37 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
50%
One or more EF2 to EF5 tornadoes
30%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
30%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Nov 29, 6:35 PM CSTSevere Thunderstorm WarningBMXPickens55 min
Nov 29, 6:53 PM CSTSevere Thunderstorm WarningBMXLamar, Marion67 min
Nov 29, 7:16 PM CSTTornado Warning Tornado observedBMXPickens17 min
Nov 29, 7:22 PM CSTTornado Warning Tornado observedBMXFayette, Lamar53 min
Nov 29, 7:28 PM CSTTornado WarningBMXMarion, Winston62 min
Nov 29, 7:52 PM CSTTornado WarningBMXFayette38 min
Nov 29, 8:09 PM CSTTornado Warning Tornado observedBMXWinston21 min
Nov 29, 8:19 PM CSTTornado WarningBMXWinston26 min
Nov 29, 8:24 PM CSTTornado WarningBMXWalker, Winston44 min
Nov 29, 8:27 PM CSTTornado WarningBMXLamar, Pickens46 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 12:00Z, 11.6 hours before the alert went out and 231 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 12:00Z on 2016-11-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2016-11-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 179 square meters per square second.1939587897117136Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
2018 m above ground
0-6 km bulk shear
65 kt
0-1 km storm-relative helicity
179 m²/s²
0-3 km storm-relative helicity
254 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

595 
WWUS20 KWNS 292333
SEL6  
SPC WW 292333
ALZ000-300400-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 506
NWS STORM PREDICTION CENTER NORMAN OK
535 PM CST TUE NOV 29 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  WEST CENTRAL ALABAMA

* EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 535 PM UNTIL
  1000 PM CST.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES AND A COUPLE INTENSE TORNADOES POSSIBLE
  ISOLATED VERY LARGE HAIL EVENTS TO 2 INCHES IN DIAMETER POSSIBLE
  ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE

SUMMARY...SUPERCELL THUNDERSTORMS OVER EASTERN MS ARE MAINTAINING
THEIR INTENSITY...AND MAY TRACK INTO WESTERN AL DURING THE NEXT FEW
HOURS.  LARGE HAIL...DAMAGING WINDS...AND ISOLATED TORNADOES WILL BE
POSSIBLE IN THE STRONGEST CELLS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES SOUTH SOUTHWEST OF TUSCALOOSA
AL TO 70 MILES NORTH OF TUSCALOOSA AL. FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU6).

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...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN
STORM MOTION VECTOR 24035.

...HART

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Nov 28, 6:36 PM CSTMesoscale DiscussionSPCChoctaw, Clarke, Monroe, Washington2 hr
Nov 28, 7:00 PM CSTMesoscale DiscussionSPCBibb, Blount, Chilton, Cullman, DeKalb, Etowah and 7 more90 min
Nov 28, 8:39 PM CSTMesoscale DiscussionSPCChoctaw, Washington96 min
Nov 28, 11:38 PM CSTMesoscale DiscussionSPCAutauga, Butler, Clarke, Dallas, Elmore, Lowndes and 5 more3 hr
Nov 29, 3:08 PM CSTMesoscale DiscussionSPCColbert, Franklin, Lamar, Lauderdale, Marion2 hr
Nov 29, 3:48 PM CSTTornado WatchSPCColbert, Franklin, Lauderdale7 hr
Nov 29, 4:46 PM CSTMesoscale DiscussionSPCFayette, Greene, Hale, Lamar, Marion, Pickens and 2 more2 hr
Nov 29, 5:24 PM CSTMesoscale DiscussionSPCColbert, Franklin, Jackson, Lauderdale, Lawrence, Limestone and 5 more96 min

Nearby

Tornado 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.