Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL6
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 276
NWS STORM PREDICTION CENTER NORMAN OK
955 PM EDT FRI MAY 8 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
NORTHWEST NORTH CAROLINA
SOUTHWEST VIRGINIA
SOUTHERN WEST VIRGINIA
EFFECTIVE THIS FRIDAY NIGHT AND SATURDAY MORNING FROM 955 PM
UNTIL 300 AM EDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 60 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE
MILES NORTH AND SOUTH OF A LINE FROM 35 MILES SOUTHWEST OF
ROANOKE VIRGINIA TO 30 MILES EAST SOUTHEAST OF LYNCHBURG
VIRGINIA. 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...CONTINUE...WW 271...WW 272...WW
273...WW 274...WW 275...
DISCUSSION...SCTD SUSTAINED STORMS/WEAK SUPERCELLS EXPECTED TO
CONTINUE GRADUALLY SPREADING E ACROSS THE CNTRL APPALACHIANS...IN
CURRENT OF ENHANCED WSWLY LOW TO MID LVL FLOW ON S SIDE OF MCV NOW
NW OF HTS. ALTHOUGH DIURNAL COOLING WILL DIMINISH LOW LVL
INSTABILITY...STORMS LIKELY WILL CONTINUE TO REDEVELOP UPSTREAM
ALONG SW FLANK OF LOW LVL COLD POOL LEFT BY MCV /I.E. OVER FAR SW
VA/ERN KY/. THESE STORMS MAY GRADUALLY SPREAD FARTHER E ACROSS SW
VA/NW NC AS MOISTENING AND ASCENT CONTINUE ACROSS REGION ON S SIDE
OF MCV.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1 INCH. EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 50 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 400.
MEAN STORM MOTION VECTOR 27040.
...CORFIDI
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW6
WW 276 TORNADO NC VA WV 090155Z - 090700Z
AXIS..45 STATUTE MILES NORTH AND SOUTH OF LINE..
35SW ROA/ROANOKE VA/ - 30ESE LYH/LYNCHBURG VA/
..AVIATION COORDS.. 40NM N/S /16ESE PSK - 26ESE LYH/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..50 KNOTS.
MAX TOPS TO 400. MEAN STORM MOTION VECTOR 27040.
LAT...LON 37618043 37817869 36507869 36318043
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU6.
Watch 276 Status Report Messages:
STATUS REPORT #1 ON WW 276
VALID 090345Z - 090440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 773
..GUYER..05/09/09
ATTN...WFO...RNK...
&&
STATUS REPORT FOR WT 276
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
NCC033-157-169-090440-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
CASWELL ROCKINGHAM STOKES
$$
VAC005-009-011-019-023-029-031-037-045-063-067-083-089-121-141-
143-161-163-515-530-580-590-678-680-690-750-770-775-090440-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ALLEGHANY AMHERST APPOMATTOX
BEDFORD BOTETOURT BUCKINGHAM
CAMPBELL CHARLOTTE CRAIG
FLOYD FRANKLIN HALIFAX
HENRY MONTGOMERY PATRICK
PITTSYLVANIA ROANOKE ROCKBRIDGE
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
BEDFORD BUENA VISTA COVINGTON
DANVILLE LEXINGTON LYNCHBURG
MARTINSVILLE RADFORD ROANOKE
SALEM
$$
WVC063-089-090440-
WV
. WEST VIRGINIA COUNTIES INCLUDED ARE
MONROE SUMMERS
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
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 (10%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (<5%)
|
Hail
Probability of 10 or more severe hail events
|
Low (20%)
|
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 (50%)
|
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.
weather.gov 
