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
SEVERE THUNDERSTORM WATCH NUMBER 731
NWS STORM PREDICTION CENTER NORMAN OK
210 PM EDT SAT AUG 22 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN MARYLAND
NORTHEASTERN NORTH CAROLINA
EASTERN VIRGINIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 210 PM UNTIL
700 PM EDT.
HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 70
STATUTE MILES EAST AND WEST OF A LINE FROM 10 MILES NORTH
NORTHEAST OF PATUXENT RIVER MARYLAND TO 10 MILES SOUTH SOUTHEAST
OF ELIZABETH CITY NORTH CAROLINA. FOR A COMPLETE DEPICTION OF
THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS
WOU1).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR 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. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY
DO PRODUCE TORNADOES.
DISCUSSION...COMPLEX OF STORMS WITH EMBEDDED MID LEVEL CIRCULATIONS
WILL CONTINUE TO TRACK EAST-NORTHEASTWARD THROUGH THE AFTERNOON.
MODERATE INSTABILITY AND 30-35 KT OF DEEP LAYER SHEAR SHOULD SUSTAIN
BOWING SEGMENTS SOUTH OF THE MID LEVEL CIRCULATIONS...WITH WIND
DAMAGE THE PRIMARY THREAT.
AVIATION...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 500. MEAN STORM MOTION
VECTOR 24025.
...IMY
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW1
WW 731 SEVERE TSTM MD NC VA CW 221810Z - 222300Z
AXIS..70 STATUTE MILES EAST AND WEST OF LINE..
10NNE NHK/PATUXENT RIVER MD/ - 10SSE ECG/ELIZABETH CITY NC/
..AVIATION COORDS.. 60NM E/W /39W SBY - 8SSE ECG/
HAIL SURFACE AND ALOFT..1 INCH. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24025.
LAT...LON 38407505 36137486 36137737 38407763
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.
Watch 731 Status Report Messages:
STATUS REPORT #4 ON WW 731
VALID 222255Z - 222340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 SE ECG TO
35 SW WAL TO 15 NE NHK.
..BROYLES..08/22/09
ATTN...WFO...LWX...AKQ...
&&
STATUS REPORT FOR WS 731
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC019-039-045-047-222340-
MD
. MARYLAND COUNTIES INCLUDED ARE
DORCHESTER SOMERSET WICOMICO
WORCESTER
$$
VAC001-222340-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK
$$
ANZ650-652-654-656-658-222340-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
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 VA TO NC VA BORDER OUT 20
NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 731
VALID 222135Z - 222240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 15 SE ECG TO
30 N ORF TO 25 S NHK TO 25 NW NHK.
..BROYLES..08/22/09
ATTN...WFO...LWX...AKQ...
&&
STATUS REPORT FOR WS 731
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC009-019-039-045-047-222240-
MD
. MARYLAND COUNTIES INCLUDED ARE
CALVERT DORCHESTER SOMERSET
WICOMICO WORCESTER
$$
VAC001-131-222240-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK NORTHAMPTON
$$
ANZ533-541-542-543-630-631-632-633-650-652-654-656-658-222240-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
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
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA
CURRITUCK SOUND
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 VA TO NC VA BORDER OUT 20
NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 731
VALID 222040Z - 222140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 20 WSW ECG
TO 10 SW ORF TO 35 E RIC TO 40 SSW DCA TO 30 SSW DCA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1956
..DIAL..08/22/09
ATTN...WFO...LWX...AKQ...
&&
STATUS REPORT FOR WS 731
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC009-019-037-039-045-047-222140-
MD
. MARYLAND COUNTIES INCLUDED ARE
CALVERT DORCHESTER ST. MARYS
SOMERSET WICOMICO WORCESTER
$$
NCC029-053-139-222140-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
CAMDEN CURRITUCK PASQUOTANK
$$
VAC001-073-099-103-115-119-131-133-159-193-550-650-700-710-740-
810-222140-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK GLOUCESTER KING GEORGE
LANCASTER MATHEWS MIDDLESEX
NORTHAMPTON NORTHUMBERLAND RICHMOND
WESTMORELAND
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE HAMPTON NEWPORT NEWS
NORFOLK PORTSMOUTH VIRGINIA BEACH
$$
ANZ533-534-537-541-542-543-630-631-632-633-650-652-654-656-658-
222140-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
TANGIER SOUND AND THE INLAND WATERS SURROUNDING BLOODSWORTH
ISLAND
CHESAPEAKE BAY FROM SMITH POINT TO WINDMILL POINT VA
CHESAPEAKE BAY FROM WINDMILL POINT TO NEW POINT COMFORT VA
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA
CURRITUCK SOUND
COASTAL WATERS FROM FENWICK ISLAND DE TO CHINCOTEAGUE VA OUT 20
NM
COASTAL WATERS FROM CHINCOTEAGUE TO PARRAMORE ISLAND VA OUT 20 NM
COASTAL WATERS FROM PARRAMORE ISLAND TO CAPE CHARLES LIGHT VA OUT
20 NM
COASTAL WATERS FROM CAPE CHARLES LIGHT VA TO NC VA BORDER OUT 20
NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC OUT
20 NM
$$
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.
$$
STATUS REPORT #1 ON WW 731
VALID 221940Z - 222040Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 40 ESE RZZ
TO 45 NE RZZ TO 10 W RIC TO 40 NNW RIC TO 35 SSW DCA.
..DIAL..08/22/09
ATTN...WFO...LWX...AKQ...
&&
STATUS REPORT FOR WS 731
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MDC009-017-019-037-039-045-047-222040-
MD
. MARYLAND COUNTIES INCLUDED ARE
CALVERT CHARLES DORCHESTER
ST. MARYS SOMERSET WICOMICO
WORCESTER
$$
NCC015-029-041-053-073-091-139-143-222040-
NC
. NORTH CAROLINA COUNTIES INCLUDED ARE
BERTIE CAMDEN CHOWAN
CURRITUCK GATES HERTFORD
PASQUOTANK PERQUIMANS
$$
VAC001-033-036-057-073-085-087-093-095-097-099-101-103-115-119-
127-131-133-149-159-175-181-193-199-550-620-650-670-700-710-735-
740-760-800-810-830-222040-
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK CAROLINE CHARLES CITY
ESSEX GLOUCESTER HANOVER
HENRICO ISLE OF WIGHT JAMES CITY
KING AND QUEEN KING GEORGE KING WILLIAM
LANCASTER MATHEWS MIDDLESEX
NEW KENT NORTHAMPTON NORTHUMBERLAND
PRINCE GEORGE RICHMOND SOUTHAMPTON
SURRY WESTMORELAND YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE FRANKLIN HAMPTON
HOPEWELL NEWPORT NEWS NORFOLK
POQUOSON PORTSMOUTH RICHMOND
SUFFOLK VIRGINIA BEACH WILLIAMSBURG
$$
ANZ533-534-535-537-541-542-543-630-631-632-633-650-652-654-656-
658-222040-
CW
. ADJACENT COASTAL WATERS INCLUDED ARE
CHESAPEAKE BAY FROM NORTH BEACH TO DRUM POINT MD
CHESAPEAKE BAY FROM DRUM POINT MD TO SMITH POINT VA
TIDAL POTOMAC FROM KEY BRIDGE TO INDIAN HEAD MD
TIDAL POTOMAC FROM COBB ISLAND MD TO SMITH POINT VA
CHOPTANK RIVER TO CAMBRIDGE MD AND THE LITTLE CHOPTANK RIVER
PATUXENT RIVER TO BROOMES ISLAND MD
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
CHESAPEAKE BAY FROM NEW POINT COMFORT TO CAPE HENRY VA
CURRITUCK SOUND
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 VA TO NC VA BORDER OUT 20
NM
COASTAL WATERS FROM NC VA BORDER TO CURRITUCK BEACH LIGHT NC 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
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (50%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
Low (10%)
|
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.