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 177
NWS STORM PREDICTION CENTER NORMAN OK
1245 AM EDT MON APR 20 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
PARTS OF NORTHEAST GEORGIA
PARTS OF SOUTHWESTERN NORTH CAROLINA
PARTS OF WESTERN SOUTH CAROLINA
EFFECTIVE THIS MONDAY MORNING FROM 1245 AM UNTIL 700 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 55 STATUTE
MILES EITHER SIDE OF A LINE FROM 35 MILES WEST SOUTHWEST OF
ATHENS GEORGIA TO 50 MILES EAST NORTHEAST OF SPARTANBURG 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.
OTHER WATCH INFORMATION...CONTINUE...WW 175...WW 176...
DISCUSSION...STRONG COUPLED JET ACCOMPANYING UPPER TROUGH
TRANSLATING ACROSS WATCH AREA PROVIDING VERY FAVORABLE SHEAR
PROFILES FOR LOW TOPPED SUPERCELLS. INSTABILITY LIMITED...HOWEVER
SUFFICIENT...REF OBSERVED LIGHTNING IN NERN GA FOR THUNDERSTORMS.
THUS TORNADOS WILL BE POSSIBLE WITH ANY ROTATING STORM THAT DEVELOPS
IN THIS FAVORABLE SHEAR AND KINEMATIC ENVIRONMENT.
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 400.
MEAN STORM MOTION VECTOR 24040.
...HALES
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 177 TORNADO GA NC SC 200445Z - 201100Z
AXIS..55 STATUTE MILES EITHER SIDE OF LINE..
35WSW AHN/ATHENS GA/ - 50ENE SPA/SPARTANBURG SC/
..AVIATION COORDS.. 50NM EITHER SIDE /28ENE ATL - 11W CLT/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 400. MEAN STORM MOTION VECTOR 24040.
LAT...LON 34458433 35908158 34478072 33048345
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 177 Status Report Messages:
STATUS REPORT #1 ON WW 177
VALID 200740Z - 200840Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 ENE ATL
TO 25 SW AND TO 15 NNW GSP TO 5 WNW HKY.
..GOSS..04/20/09
ATTN...WFO...FFC...CAE...GSP...
&&
STATUS REPORT FOR WT 177
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
GAC009-059-073-105-119-133-141-147-157-169-181-189-195-211-219-
221-237-245-265-301-317-200840-
GA
. GEORGIA COUNTIES INCLUDED ARE
BALDWIN CLARKE COLUMBIA
ELBERT FRANKLIN GREENE
HANCOCK HART JACKSON
JONES LINCOLN MCDUFFIE
MADISON MORGAN OCONEE
OGLETHORPE PUTNAM RICHMOND
TALIAFERRO WARREN WILKES
$$
NCC035-045-071-109-119-149-161-200840-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
CATAWBA CLEVELAND GASTON
LINCOLN MECKLENBURG POLK
RUTHERFORD
$$
SCC001-007-021-023-037-039-045-047-059-065-071-081-083-087-091-
200840-
SC
. SOUTH CAROLINA COUNTIES INCLUDED ARE
ABBEVILLE ANDERSON CHEROKEE
CHESTER EDGEFIELD FAIRFIELD
GREENVILLE GREENWOOD LAURENS
MCCORMICK NEWBERRY SALUDA
SPARTANBURG UNION YORK
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
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
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (10%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
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.
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