Alert archive / Alabama / Tornado Watches in 2016

Tornado Watch 510

November 29, 201611 counties in Alabama; Franklin County, Lincoln County, Moore County, Tennessee

The Storm Prediction Center issued this tornado watch at Nov 29, 2016, 10:28 PM CST for 11 counties in Alabama; Franklin County, Lincoln County, Moore County, Tennessee. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Nov 29, 2016, 10:28 PM CST (04:28 UTC)
Expired
Nov 30, 2016, 3:00 AM CST
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt

Counties Colbert County, AL, Cullman County, AL, DeKalb County, AL, Franklin County, AL, Jackson County, AL, Lauderdale County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Franklin County, TN, Lincoln County, TN, Moore County, TN

The radar

The Northeast Alabama radar (KHTX), 103 km from the middle of the area, began a volume at 04:31 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
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
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Nov 29, 10:31 PM CSTTornado WarningHUNMorgan29 min
Nov 29, 10:34 PM CSTSevere Thunderstorm WarningHUNMadison41 min
Nov 29, 10:49 PM CSTSevere Thunderstorm WarningHUNJackson41 min
Nov 29, 10:54 PM CSTTornado WarningHUNJackson36 min
Nov 29, 10:56 PM CSTTornado WarningHUNMarshall, Morgan22 min
Nov 29, 11:06 PM CSTSevere Thunderstorm WarningHUNFranklin39 min
Nov 29, 11:12 PM CSTTornado WarningHUNMadison, Marshall14 min
Nov 29, 11:17 PM CSTTornado WarningHUNFranklin12 min
Nov 29, 11:32 PM CSTSevere Thunderstorm WarningHUNJackson, Marshall43 min
Nov 30, 12:02 AM CSTTornado WarningHUNDeKalb, Jackson24 min
Nov 30, 12:05 AM CSTSevere Thunderstorm WarningHUNFranklin, Lawrence, Morgan40 min
Nov 30, 12:23 AM CSTTornado WarningHUNJackson23 min
Nov 30, 12:37 AM CSTSevere Thunderstorm WarningHUNLawrence, Limestone, Madison, Morgan38 min
Nov 30, 12:50 AM CSTSevere Thunderstorm WarningHUNLawrence, Morgan40 min
Nov 30, 12:55 AM CSTSevere Thunderstorm WarningHUNLimestone, Madison, Morgan50 min
Nov 30, 1:21 AM CSTSevere Thunderstorm WarningHUNMadison, Marshall, Morgan39 min
Nov 30, 1:40 AM CSTSevere Thunderstorm WarningHUNJackson65 min
Nov 30, 1:41 AM CSTFlash Flood WarningHUNLawrence, Limestone, Madison, Morgan6 hr
Nov 30, 1:44 AM CSTTornado WarningHUNJackson31 min
Nov 30, 1:53 AM CSTSevere Thunderstorm WarningHUNJackson, Madison, Marshall, Morgan40 min
Nov 30, 2:12 AM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson33 min
Nov 30, 2:15 AM CSTTornado WarningHUNJackson30 min
Nov 30, 2:37 AM CSTTornado WarningHUNCullman38 min
Nov 30, 2:39 AM CSTSevere Thunderstorm WarningHUNDeKalb, Jackson36 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

Nashville Metro, TN (KBNA), launched 00:00Z, 4.5 hours before the alert went out and 156 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, Nashville Metro, TN at 00:00Z on 2016-11-30Temperature 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, Nashville Metro, TN at 00:00Z on 2016-11-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 321 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1648 m above ground
0-6 km bulk shear
90 kt
0-1 km storm-relative helicity
321 m²/s²
0-3 km storm-relative helicity
354 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

712 
WWUS20 KWNS 300423
SEL0  
SPC WW 300423
ALZ000-TNZ000-300900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 510
NWS STORM PREDICTION CENTER NORMAN OK
1025 PM CST TUE NOV 29 2016

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  NORTHERN ALABAMA
  SOUTHERN MIDDLE TENNESSEE

* EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1025 PM
  UNTIL 300 AM CST.

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

SUMMARY...ISOLATED INTENSE THUNDERSTORMS WILL REMAIN POSSIBLE OVER
THE WATCH AREA FOR SEVERAL MORE HOURS...POSING A RISK OF DAMAGING
WINDS AND ISOLATED TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 35 STATUTE MILES
NORTH AND SOUTH OF A LINE FROM 35 MILES WEST OF MUSCLE SHOALS AL TO
65 MILES EAST OF HUNTSVILLE AL. FOR A COMPLETE DEPICTION OF THE
WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).

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 505...WW 507...WW
508...WW 509...

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, 8:50 PM CSTTornado WatchSPCBibb, Blount, Fayette, Greene, Hale, Jefferson and 7 more8 hr
Nov 29, 9:28 PM CSTMesoscale DiscussionSPCCullman, DeKalb, Jackson, Lawrence, Limestone, Madison and 2 more62 min
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 DiscussionSPCAttala, Choctaw, Claiborne, Hinds, Holmes, Humphreys and 13 more114 min
Nov 29, 9:47 PM CSTMesoscale DiscussionSPCAdams, Amite, Claiborne, Copiah, Franklin, Hinds and 5 more58 min
Nov 30, 3:33 AM CSTMesoscale DiscussionSPCAmite, Clarke, Covington, Forrest, Hancock, Jasper and 17 more87 min
Nov 29, 10:11 PM CSTTornado WatchSPCBledsoe, Bradley, Hamilton, McMinn, Marion, Meigs and 2 more5 hr
Nov 29, 11:46 PM CSTMesoscale DiscussionSPCAnderson, Blount, Campbell, Claiborne, Grainger, Hamblen and 6 more119 min

Nearby

Tornado Watches in Alabama, 2016Tornado Watches in Tennessee, 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.