Alert archive / Tennessee / Tornado Watches in 2015
Tornado Watch 567
The Storm Prediction Center issued this tornado watch at Dec 23, 2015, 10:33 PM CST for 8 counties in Alabama; Catoosa County, Dade County, Walker County, Georgia; 30 counties in Tennessee. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 23, 2015, 10:33 PM CST (04:33 UTC)
- Expired
- Dec 24, 2015, 3:18 AM CST
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
All 41 counties
Cullman County, AL, DeKalb County, AL, Jackson County, AL, Lawrence County, AL, Limestone County, AL, Madison County, AL, Marshall County, AL, Morgan County, AL, Catoosa County, GA, Dade County, GA, Walker County, GA, Bedford County, TN, Bledsoe County, TN, Cannon County, TN, Clay County, TN, Coffee County, TN, Cumberland County, TN, DeKalb County, TN, Fentress County, TN, Franklin County, TN, Giles County, TN, Grundy County, TN, Hamilton County, TN, Jackson County, TN, Lincoln County, TN, Marion County, TN, Marshall County, TN, Meigs County, TN, Moore County, TN, Morgan County, TN, Overton County, TN, Pickett County, TN, Putnam County, TN, Rhea County, TN, Roane County, TN, Rutherford County, TN, Scott County, TN, Sequatchie County, TN, Van Buren County, TN, Warren County, TN, White County, TN
The radar
The Northeast Alabama radar (KHTX), 96 km from the middle of the area, began a volume at 04:36 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
- 10%
- Six or more combined severe hail and wind reports
- 60%
Warnings issued inside it
5 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 10:50 PM CST | Severe Thunderstorm Warning | OHX | Clay, Fentress, Overton, Pickett | 25 min |
| Dec 23, 11:01 PM CST | Severe Thunderstorm Warning | OHX | DeKalb, Overton, Putnam, White | 29 min |
| Dec 23, 11:13 PM CST | Severe Thunderstorm Warning | OHX | Fentress, Overton, Pickett | 32 min |
| Dec 24, 1:20 AM CST | Severe Thunderstorm Warning | HUN | DeKalb, Jackson | 25 min |
| Dec 24, 1:53 AM CST | Severe Thunderstorm Warning | FFC | Catoosa, Walker, Whitfield | 37 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, 4.6 hours before the alert went out and 94 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
- 26 J/kg
- Mixed-layer CIN
- -82 J/kg
- Mixed-layer LCL
- 624 m above ground
- 0-6 km bulk shear
- 89 kt
- 0-1 km storm-relative helicity
- 598 m²/s²
- 0-3 km storm-relative helicity
- 698 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
442 WWUS20 KWNS 240431 SEL7 SPC WW 240431 ALZ000-GAZ000-TNZ000-241000- URGENT - IMMEDIATE BROADCAST REQUESTED TORNADO WATCH NUMBER 567 NWS STORM PREDICTION CENTER NORMAN OK 1035 PM CST WED DEC 23 2015 THE NWS STORM PREDICTION CENTER HAS ISSUED A * TORNADO WATCH FOR PORTIONS OF NORTHEAST ALABAMA EXTREME NORTHWEST GEORGIA PARTS OF MIDDLE AND EASTERN TENNESSEE * EFFECTIVE THIS WEDNESDAY NIGHT AND THURSDAY MORNING FROM 1035 PM UNTIL 400 AM CST. * PRIMARY THREATS INCLUDE... A COUPLE TORNADOES POSSIBLE ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE ISOLATED LARGE HAIL EVENTS TO 1 INCH IN DIAMETER POSSIBLE SUMMARY...BROKEN BANDS OF STRONG/SEVERE STORMS WILL PERSIST INTO THE EARLY MORNING HOURS FROM NORTH CENTRAL AND NORTHEAST ALABAMA INTO PARTS OF MIDDLE/EASTERN TENNESSEE AND EXTREME NORTHWEST GEORGIA. THE STORM ENVIRONMENT WILL REMAIN FAVORABLE FOR ROTATING STORMS CAPABLE OF PRODUCING A COUPLE OF TORNADOES...DAMAGING GUSTS...AND SOME HAIL. THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 50 STATUTE MILES EAST AND WEST OF A LINE FROM 50 MILES NORTH NORTHEAST OF CROSSVILLE TENNESSEE TO 20 MILES SOUTH SOUTHEAST OF HUNTSVILLE ALABAMA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU7). 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...THIS TORNADO WATCH REPLACES TORNADO WATCH NUMBER 564. WATCH NUMBER 564 WILL NOT BE IN EFFECT AFTER 1035 PM CST. CONTINUE...WW 565...WW 566... AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR 24045. ...THOMPSON
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 23, 6:35 PM CST | Mesoscale Discussion | SPC | Colbert, Franklin, Lauderdale, Lawrence, Limestone, Madison and 1 more | 55 min |
| Dec 23, 7:41 PM CST | Mesoscale Discussion | SPC | Bibb, Fayette, Greene, Hale, Jefferson, Lamar and 8 more | 2 hr |
| Dec 23, 8:20 PM CST | Tornado Watch | SPC | Bibb, Fayette, Greene, Hale, Jefferson, Lamar and 7 more | 8 hr |
| Dec 23, 10:11 PM CST | Mesoscale Discussion | SPC | Blount, Calhoun, Cherokee, Cullman, DeKalb, Etowah and 12 more | 2 hr |
| Dec 24, 3:10 AM CST | Mesoscale Discussion | SPC | Autauga, Barbour, Bullock, Butler, Chambers, Coffee and 19 more | 2 hr |
| Dec 24, 3:27 AM CST | Mesoscale Discussion | SPC | Bibb, Blount, Calhoun, Chambers, Cherokee, Chilton and 16 more | 93 min |
| Dec 24, 4:09 AM CST | Tornado Watch | SPC | Barbour, Bullock, Coffee, Dale, Geneva, Henry and 5 more | 7 hr |
| Dec 24, 7:07 AM CST | Mesoscale Discussion | SPC | Barbour, Bullock, Coffee, Covington, Dale, Henry and 2 more | 83 min |
| Dec 23, 7:42 PM CST | Mesoscale Discussion | SPC | Pickett | 2 hr |
Nearby
Tornado Watches in Tennessee, 2015Tornado Watches in Alabama, 2015Tornado Watches in Georgia, 2015Every tornado watch in 2015
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.