Alert archive / Georgia / Tornado Watches in 2007
Tornado Watch 146
The Storm Prediction Center issued this tornado watch at Apr 15, 2007, 5:57 AM EDT for 20 counties in Georgia. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 15, 2007, 5:57 AM EDT (09:57 UTC)
- Expired
- Apr 15, 2007, 11:00 AM EDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 1 in
- Strongest gust expected
- 60 kt
Counties Appling County, GA, Atkinson County, GA, Bacon County, GA, Bryan County, GA, Bulloch County, GA, Candler County, GA, Chatham County, GA, Coffee County, GA, Effingham County, GA, Evans County, GA, Jeff Davis County, GA, Jenkins County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Screven County, GA, Tattnall County, GA, Ware County, GA, Wayne County, GA
The radar
The Charleston,SC radar (KCLX), 130 km from the middle of the area, began a volume at 09:59 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
- 30%
- One or more EF2 to EF5 tornadoes
- 20%
- Ten or more severe wind reports
- 20%
- One or more gusts of 65 knots or more
- 10%
- Ten or more severe hail reports
- 5%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 30%
Warnings issued inside it
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 15, 6:59 AM EDT | Severe Thunderstorm Warning | JAX | Charlton, Ware | 31 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
Jacksonville, FL (KJAX), launched 00:00Z, 10.0 hours before the alert went out and 177 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
- 344 J/kg
- Mixed-layer CIN
- -83 J/kg
- Mixed-layer LCL
- 1113 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 150957
SEL6
SPC WW 150957
GAZ000-CWZ000-151500-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 146
NWS STORM PREDICTION CENTER NORMAN OK
600 AM EDT SUN APR 15 2007
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST GEORGIA
COASTAL WATERS
EFFECTIVE THIS SUNDAY MORNING FROM 600 AM UNTIL 1100 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 40 MILES NORTHEAST OF VIDALIA
GEORGIA TO 15 MILES EAST SOUTHEAST OF WAYCROSS GEORGIA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU6).
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 144. WATCH NUMBER 144 WILL NOT BE IN EFFECT AFTER
600 AM EDT. CONTINUE...WW 145...
DISCUSSION...BROKEN BAND OF STORMS ALONG COLD FRONT WILL MOVE FROM
CENTRAL INTO SE GA DURING THE NEXT FEW HOURS. THOUGH INSTABILITY IS
LIMITED...VERTICAL SHEAR REMAINS SUFFICIENT FOR SUPERCELLS AND THE
POSSIBILITY OF A TORNADO OR TWO...AS WELL AS A FEW DAMAGING GUSTS.
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 450.
MEAN STORM MOTION VECTOR 24040.
...THOMPSONSPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 14, 8:09 PM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Baldwin, Ben Hill and 93 more | 2 hr |
| Apr 14, 10:10 PM EDT | Mesoscale Discussion | SPC | Burke, Columbia, Jenkins, Lincoln, Richmond, Screven | 95 min |
| Apr 14, 11:45 PM EDT | Tornado Watch | SPC | Appling, Atkinson, Bacon, Baker, Ben Hill, Berrien and 57 more | 6 hr |
| Apr 15, 2:01 AM EDT | Tornado Watch | SPC | Burke | 7 hr |
| Apr 15, 3:57 AM EDT | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Ben Hill, Berrien, Bleckley and 39 more | 93 min |
| Apr 15, 10:20 AM EDT | Mesoscale Discussion | SPC | Chatham | 55 min |
| Apr 15, 3:33 AM EDT | Mesoscale Discussion | SPC | Chesterfield, Darlington, Fairfield, Kershaw, Lancaster, Lee and 3 more | 87 min |
| Apr 15, 7:39 AM EDT | Mesoscale Discussion | SPC | Bamberg, Berkeley, Calhoun, Charleston, Chesterfield, Clarendon and 13 more | 66 min |
| Apr 15, 8:08 AM EDT | Tornado Watch | SPC | Allendale, Bamberg, Barnwell, Beaufort, Berkeley, Calhoun and 17 more | 7 hr |
| Apr 15, 11:15 AM EDT | Mesoscale Discussion | SPC | Berkeley, Charleston, Dillon, Dorchester, Florence, Georgetown and 3 more | 2 hr |
| Apr 15, 12:19 PM EDT | Mesoscale Discussion | SPC | Chester, Lancaster, York | 86 min |
Nearby
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.