Alert archive / Tennessee / Tornado Watches in 2016
Tornado Watch 509
The Storm Prediction Center issued this tornado watch at Nov 29, 2016, 11:11 PM EST for 5 counties in Georgia; 8 counties in Tennessee. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Nov 29, 2016, 11:11 PM EST (04:11 UTC)
- Expired
- Nov 30, 2016, 3:55 AM EST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1.5 in
- Strongest gust expected
- 60 kt
Counties Catoosa County, GA, Chattooga County, GA, Dade County, GA, Walker County, GA, Whitfield County, GA, Bledsoe County, TN, Bradley County, TN, Hamilton County, TN, Marion County, TN, McMinn County, TN, Meigs County, TN, Rhea County, TN, Sequatchie County, TN
The radar
The Northeast Alabama radar (KHTX), 59 km from the middle of the area, began a volume at 04:13 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
- 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
23 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 29, 11:14 PM EST | Tornado Warning | MRX | Marion | 31 min |
| Nov 29, 11:41 PM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Sequatchie | 23 min |
| Nov 29, 11:42 PM EST | Severe Thunderstorm Warning | MRX | Marion, Sequatchie | 48 min |
| Nov 29, 11:58 PM EST | Tornado Warning | MRX | Bledsoe, Hamilton, Marion, Sequatchie | 47 min |
| Nov 30, 12:05 AM EST | Severe Thunderstorm Warning | FFC | Dade | 40 min |
| Nov 30, 12:09 AM EST | Severe Thunderstorm Warning | MRX | Hamilton, Marion | 36 min |
| Nov 30, 12:23 AM EST | Tornado Warning | MRX | Bledsoe, Rhea | 24 min |
| Nov 30, 12:26 AM EST | Severe Thunderstorm Warning | MRX | Marion, Sequatchie | 34 min |
| Nov 30, 12:34 AM EST | Tornado Warning | MRX | Bradley, Hamilton | 26 min |
| Nov 30, 12:54 AM EST | Tornado Warning | MRX | Bradley, Hamilton, McMinn, Meigs | 36 min |
| Nov 30, 1:14 AM EST | Severe Thunderstorm Warning | FFC | Dade, Walker | 31 min |
| Nov 30, 1:18 AM EST | Tornado Warning | FFC | Dade, Walker | 26 min |
| Nov 30, 1:20 AM EST | Tornado Warning | MRX | McMinn, Monroe | 25 min |
| Nov 30, 1:36 AM EST | Severe Thunderstorm Warning | MRX | McMinn, Meigs | 24 min |
| Nov 30, 1:37 AM EST | Severe Thunderstorm Warning | FFC | Catoosa, Walker | 23 min |
| Nov 30, 1:41 AM EST | Severe Thunderstorm Warning | MRX | Hamilton | 34 min |
| Nov 30, 1:53 AM EST | Tornado Warning | FFC | Catoosa | 18 min |
| Nov 30, 2:00 AM EST | Tornado Warning | MRX | Bradley, Hamilton, Polk | 30 min |
| Nov 30, 2:07 AM EST | Severe Thunderstorm Warning | MRX | Loudon, McMinn, Monroe | 23 min |
| Nov 30, 2:29 AM EST | Tornado Warning | MRX | Bradley, McMinn, Monroe, Polk | 31 min |
| Nov 30, 3:13 AM EST | Severe Thunderstorm Warning | MRX | Marion, Sequatchie | 32 min |
| Nov 30, 3:41 AM EST | Severe Thunderstorm Warning | MRX | Bledsoe, Hamilton, Marion, Meigs, Rhea, Sequatchie | 34 min |
| Nov 30, 3:47 AM EST | Severe Thunderstorm Warning | FFC | Catoosa, Dade, Walker | 43 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, 4.2 hours before the alert went out and 160 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.
- 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
The text
As transmitted.
689 WWUS20 KWNS 300407 SEL9 SPC WW 300407 GAZ000-TNZ000-300900- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 509 NWS STORM PREDICTION CENTER NORMAN OK 1110 PM EST TUE NOV 29 2016 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHWEST GEORGIA SOUTHEAST TENNESSEE * EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 1110 PM UNTIL 400 AM EST. * PRIMARY THREATS INCLUDE... A COUPLE INTENSE TORNADOES POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE SUMMARY...A CLUSTER OF SUPERCELL THUNDERSTORMS OVER NORTHEAST AL AND SOUTHERN MIDDLE TN WILL TRACK NORTHEASTWARD AND AFFECT THE WATCH AREA OVERNIGHT. DAMAGING WIND GUSTS AND ISOLATED TORNADOES ARE THE MAIN THREAT. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 30 STATUTE MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTH SOUTHWEST OF CHATTANOOGA TN TO 50 MILES NORTH OF CHATTANOOGA TN. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU9). 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... 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 450. MEAN STORM MOTION VECTOR 24035. ...HART
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 29, 10:28 PM EST | Mesoscale Discussion | SPC | Dade | 62 min |
| Nov 30, 12:17 AM EST | Mesoscale Discussion | SPC | Catoosa, Dade, Walker, Whitfield | 118 min |
| Nov 30, 2:07 AM EST | Mesoscale Discussion | SPC | Catoosa, Dade, Walker, Whitfield | 53 min |
| Nov 30, 3:54 AM EST | Tornado Watch | SPC | Bartow, Catoosa, Chattooga, Cherokee, Dade, Fannin and 10 more | 7 hr |
| Nov 30, 6:10 AM EST | Mesoscale Discussion | SPC | Bartow, Carroll, Catoosa, Chattooga, Cherokee, Dade and 16 more | 95 min |
| Nov 30, 10:00 AM EST | Mesoscale Discussion | SPC | Bartow, Carroll, Chattooga, Cherokee, Clayton, Cobb and 21 more | 2 hr |
| Nov 30, 12:06 PM EST | Tornado Watch | SPC | Baker, Banks, Barrow, Bartow, Butts, Calhoun and 53 more | 6 hr |
| Nov 30, 1:59 PM EST | Mesoscale Discussion | SPC | Baker, Barrow, Butts, Calhoun, Chattahoochee, Clay and 41 more | 2 hr |
| Nov 30, 2:55 PM EST | Mesoscale Discussion | SPC | Baker, Baldwin, Banks, Barrow, Bibb, Bleckley and 70 more | 2 hr |
| Nov 30, 3:23 PM EST | Severe Thunderstorm Watch | SPC | Baldwin, Bibb, Bleckley, Columbia, Crisp, Dooly and 22 more | 3 hr |
| Nov 30, 5:43 PM EST | Mesoscale Discussion | SPC | Columbia, Elbert, Glascock, Hancock, Lincoln, McDuffie and 5 more | 92 min |
| Nov 30, 5:45 PM EST | Mesoscale Discussion | SPC | Baker, Calhoun, Decatur, Dougherty, Early, Grady and 7 more | 30 min |
| Nov 29, 7:43 PM EST | Mesoscale Discussion | SPC | Hardin, Lawrence, Wayne | 92 min |
| Nov 29, 7:47 PM EST | Tornado Watch | SPC | Bedford, Coffee, Franklin, Giles, Grundy, Lewis and 5 more | 8 hr |
| Nov 29, 11:28 PM EST | Tornado Watch | SPC | Franklin, Lincoln, Moore | 5 hr |
| Nov 30, 12:46 AM EST | Mesoscale Discussion | SPC | Anderson, Blount, Campbell, Claiborne, Grainger, Hamblen and 6 more | 119 min |
Nearby
Tornado Watches in Tennessee, 2016Tornado Watches in Georgia, 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.