Alert archive / Georgia / Tornado Watches in 2013
Tornado Watch 35
The Storm Prediction Center issued this tornado watch at Feb 13, 2013, 5:31 AM EST for 15 counties in Georgia. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 13, 2013, 5:31 AM EST (10:31 UTC)
- Expired
- Feb 13, 2013, 9:00 AM EST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
- Largest hail expected
- 0.5 in
- Strongest gust expected
- 60 kt
Counties Appling County, GA, Atkinson County, GA, Bacon County, GA, Brantley County, GA, Bryan County, GA, Chatham County, GA, Coffee County, GA, Glynn County, GA, Jeff Davis County, GA, Liberty County, GA, Long County, GA, McIntosh County, GA, Pierce County, GA, Ware County, GA, Wayne County, GA
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
- 5%
- Ten or more severe hail reports
- 10%
- One or more hailstones of 2 inches or more
- 5%
- Six or more combined severe hail and wind reports
- 40%
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 |
|---|---|---|---|---|
| Feb 13, 5:39 AM EST | Severe Thunderstorm Warning | JAX | Appling, Atkinson, Bacon, Brantley, Coffee, Pierce and 2 more | 51 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, 10.5 hours before the alert went out and 106 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
- 218 J/kg
- Mixed-layer CIN
- -93 J/kg
- Mixed-layer LCL
- 887 m above ground
- 0-6 km bulk shear
- 65 kt
- 0-1 km storm-relative helicity
- 186 m²/s²
- 0-3 km storm-relative helicity
- 359 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.6
The text
As transmitted, in the capitals the NWS used until 2016.
949
WWUS20 KWNS 131036
SEL5
SPC WW 131036
GAZ000-CWZ000-131400-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 35
NWS STORM PREDICTION CENTER NORMAN OK
530 AM EST WED FEB 13 2013
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST GEORGIA
COASTAL WATERS
EFFECTIVE THIS WEDNESDAY MORNING FROM 530 AM UNTIL 900 AM EST.
TORNADOES...HAIL TO 0.5 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 65 STATUTE
MILES EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHEAST OF
WAYCROSS GEORGIA TO 55 MILES NORTH OF BRUNSWICK GEORGIA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU5).
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.
DISCUSSION...SCTD SUSTAINED TSTMS EXPECTED TO PERSIST IN ENVIRONMENT
OF DEEP...STRONG...LARGELY UNIDIRECTIONAL WSW FLOW OVER SE GA.
UPLIFT IS BEING FOCUSED ALONG SFC STNRY FRONT ALIGNED PARALLEL TO
DEEP FLOW. GIVEN STRENGTH OF DEEP SHEAR /60 KTS/...RICH MOISTURE /PW
AOA 1.5 INCHES/...AND FRICTIONALLY-ENHANCED LOW-LVL SHEAR CLOSER TO
THE ATLANTIC COAST...THE STORMS MOVING ALONG THE BOUNDARY COULD POSE
A TORNADO THREAT...IN ADDITION TO LOCALLY DMGG WIND...BEFORE MOVING
OFFSHORE.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
400. MEAN STORM MOTION VECTOR 26040.
...CORFIDISPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 12, 11:46 PM EST | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Ben Hill, Berrien, Brantley and 12 more | 119 min |
| Feb 13, 4:14 AM EST | Mesoscale Discussion | SPC | Appling, Atkinson, Bacon, Baker, Berrien, Brantley and 23 more | 2 hr |
| Feb 13, 8:38 AM EST | Mesoscale Discussion | SPC | Bacon, Brantley, Camden, Charlton, Clinch, Echols and 4 more | 67 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.