Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 811
NWS STORM PREDICTION CENTER NORMAN OK
1040 AM EDT SAT AUG 27 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
DELAWARE
EASTERN MARYLAND
SOUTHERN NEW JERSEY
SOUTHEAST VIRGINIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1040 AM UNTIL
800 PM EDT.
TORNADOES...THUNDERSTORM WIND GUSTS TO 75 MPH...AND DANGEROUS
LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 45 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES SOUTHWEST OF NORFOLK
VIRGINIA TO 15 MILES NORTH OF ATLANTIC CITY NEW JERSEY. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
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 810...
DISCUSSION...SEVERAL CONVECTIVE BANDS TO THE NORTH OF THE CENTER OF
HURRICANE IRENE CONTINUE TO CONTAIN SMALL ROTATING CELLS. THESE ARE
MOVING ONSHORE INTO THE TIDEWATER NEAR VIRGINIA BEACH AND EAST OF
CHESAPEAKE BAY OVER COASTAL VA AND MD. A THREAT FOR A FEW TORNADOES
WILL GRADUALLY SHIFT NWD ALONG THE COAST AS IRENE MOVES NNEWD PER
LATEST NHC FORECAST.
AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH EXTREME
TURBULENCE AND SURFACE WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI
WITH MAXIMUM TOPS TO 400. MEAN STORM MOTION VECTOR 11040.
...WEISS
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 811 TORNADO DE MD NJ VA CW 271440Z - 280000Z
AXIS..45 STATUTE MILES EAST AND WEST OF LINE..
35SW ORF/NORFOLK VA/ - 15N ACY/ATLANTIC CITY NJ/
..AVIATION COORDS.. 40NM E/W /29NW ECG - 12SW CYN/
WIND GUSTS..65 KNOTS.
MAX TOPS TO 400.MEAN STORM MOTION VECTOR 11040.
LAT...LON 36547745 39657543 39657373 36547583
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 811 Status Report Messages:
STATUS REPORT #1 ON WW 811
VALID 271920Z - 272040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 30 SE ORF TO
45 S NHK TO 15 SSE PHL.
..CARBIN..08/27/11
ATTN...WFO...PHI...LWX...AKQ...
&&
STATUS REPORT FOR WT 811
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
DEC001-005-272040-
DE
. DELAWARE COUNTIES INCLUDED ARE
KENT SUSSEX
$$
MDC039-045-047-272040-
MD
. MARYLAND COUNTIES INCLUDED ARE
SOMERSET WICOMICO WORCESTER
$$
NJC001-009-011-272040-
NJ
. NEW JERSEY COUNTIES INCLUDED ARE
ATLANTIC CAPE MAY CUMBERLAND
$$
VAC001-131-272040-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK NORTHAMPTON
$$
ANZ431-452-453-454-455-543-630-631-634-650-652-654-656-272040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
DELAWARE BAY WATERS SOUTH OF EAST POINT NJ TO SLAUGHTER BEACH DE
COASTAL WATERS FROM LITTLE EGG INLET TO GREAT EGG INLET NJ OUT 20
NM
COASTAL WATERS FROM GREAT EGG INLET TO CAPE MAY NJ OUT 20 NM
COASTAL WATERS FROM CAPE MAY NJ TO CAPE HENLOPEN DE OUT 20 NM
COASTAL WATERS FROM CAPE HENLOPEN TO FENWICK ISLAND DE OUT 20 NM
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA
CHESAPEKE BAY FROM LITTLE CREEK VA TO CAPE HENRY VA INCLUDING THE
CHESAPEKE BAY BRIDGE TUNNEL
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM
COASTAL WATERS FROM CAPE CHARLES LIGHT TO VIRGINIA-NORTH CAROLINA
BORDER OUT TO 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 (5%)
|
Wind
Probability of 10 or more severe wind events
|
Low (10%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
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 (30%)
|
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 
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