Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 777
NWS STORM PREDICTION CENTER NORMAN OK
710 PM EDT TUE OCT 27 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHEAST GEORGIA
EASTERN SOUTH CAROLINA
COASTAL WATERS
EFFECTIVE THIS TUESDAY NIGHT FROM 710 PM UNTIL MIDNIGHT 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 25 STATUTE
MILES EITHER SIDE OF A LINE FROM 10 MILES WEST OF SAVANNAH
GEORGIA TO 35 MILES NORTHEAST OF CHARLESTON SOUTH CAROLINA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU7).
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...ISOLATED INTENSE THUNDERSTORMS SOUTHWEST OF SAVANNAH
WILL TRACK EAST-NORTHEASTWARD THROUGH THE EVENING...ALONG AND SOUTH
OF RETREATING SURFACE BOUNDARY. MOIST AND MARGINALLY UNSTABLE
BOUNDARY LAYER OVER THIS REGION...COUPLED WITH FAVORABLE VERTICAL
SHEAR AND CONVERGENCE NEAR THE BOUNDARY...MAY POSE A RISK FOR
ISOLATED TORNADOES AND DAMAGING WINDS.
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 23030.
...HART
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 777 TORNADO GA SC CW 272310Z - 280400Z
AXIS..25 STATUTE MILES EITHER SIDE OF LINE..
10W SAV/SAVANNAH GA/ - 35NE CHS/CHARLESTON SC/
..AVIATION COORDS.. 20NM EITHER SIDE /13W SAV - 31NE CHS/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 23030.
LAT...LON 32438159 33567983 32957937 31818113
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 777 Status Report Messages:
STATUS REPORT #2 ON WW 777
VALID 280130Z - 280240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 SSW CHS
TO 35 S OGB.
..KERR..10/28/09
ATTN...WFO...CHS...
&&
STATUS REPORT FOR WT 777
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SCC015-019-029-035-280240-
SC
. SOUTH CAROLINA COUNTIES INCLUDED ARE
BERKELEY CHARLESTON COLLETON
DORCHESTER
$$
AMZ330-280240-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHARLESTON HARBOR
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 777
VALID 280040Z - 280140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SE SAV TO
30 NNW SAV.
..KERR..10/28/09
ATTN...WFO...CHS...
&&
STATUS REPORT FOR WT 777
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SCC013-015-019-029-035-049-053-280140-
SC
. SOUTH CAROLINA COUNTIES INCLUDED ARE
BEAUFORT BERKELEY CHARLESTON
COLLETON DORCHESTER HAMPTON
JASPER
$$
AMZ330-280140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHARLESTON HARBOR
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (30%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (20%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Low (<5%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (<5%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
Mod (40%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (F2-F5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.