Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL9
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 279
NWS STORM PREDICTION CENTER NORMAN OK
105 AM EDT SAT MAY 9 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
SOUTHERN VIRGINIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING FROM 105 AM UNTIL 600 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 75 STATUTE
MILES EAST AND WEST OF A LINE FROM 15 MILES NORTH OF RICHMOND
VIRGINIA TO 45 MILES EAST SOUTHEAST OF SOUTH HILL VIRGINIA. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU9).
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 273...WW 274...WW
276...WW 277...WW 278...
DISCUSSION...TSTMS ASSOCIATED WITH CURRENT OF ENHANCED WSW FLOW ON S
SIDE OF EARLIER MCV HAVE MOVED E OF THE SW VA MOUNTAINS. ACTIVITY
WILL ENCOUNTER INCREASINGLY MOIST LOW LVL INFLOW ACROSS THE ERN
PIEDMONT AND CSTL PLN. SETUP MAY SUPPORT ADDITIONAL SUSTAINED
STORMS AND POSSIBLE TORNADOES THROUGH LATER THIS MORNING.
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.
SAW9
WW 279 TORNADO VA CW 090505Z - 091000Z
AXIS..75 STATUTE MILES EAST AND WEST OF LINE..
15N RIC/RICHMOND VA/ - 45ESE AVC/SOUTH HILL VA/
..AVIATION COORDS.. 65NM E/W /13N RIC - 55WNW ECG/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..50 KNOTS.
MAX TOPS TO 400. MEAN STORM MOTION VECTOR 27040.
LAT...LON 37707594 36437594 36437865 37707868
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU9.
Watch 279 Status Report Messages:
STATUS REPORT #1 ON WW 279
VALID 090650Z - 090740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 E RZZ TO
35 SSE RIC TO 40 NNE ORF.
..SPC..05/09/09
ATTN...WFO...AKQ...
&&
STATUS REPORT FOR WT 279
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
VAC093-131-175-181-550-620-650-700-710-740-800-810-090740-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ISLE OF WIGHT NORTHAMPTON SOUTHAMPTON
SURRY
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE FRANKLIN HAMPTON
NEWPORT NEWS NORFOLK PORTSMOUTH
SUFFOLK VIRGINIA BEACH
$$
ANZ632-656-090740-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA
COASTAL WATERS FROM CAPE CHARLES LIGHT VA TO NC VA BORDER OUT 20
NM
$$
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
|
Low (<5%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (<5%)
|
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.
weather.gov 
@NWSSPC
