
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 201
NWS STORM PREDICTION CENTER NORMAN OK
1155 AM EDT SAT APR 12 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN MARYLAND
SOUTHEAST VIRGINIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1155 AM UNTIL
600 PM EDT.
HAIL TO 1.5 INCHES 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 25 MILES NORTH OF
WALLOPS VIRGINIA TO 55 MILES WEST SOUTHWEST OF NORFOLK VIRGINIA.
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...SLIGHTLY ELEVATED CONVECTION THIS MORNING IN ADVANCE OF
THE COLD FRONT WILL GRADUALLY BECOME SURFACE-BASED AS THE LOW LEVELS
DESTABILIZE VIA DAYTIME HEATING. MLCAPE VALUES OF 500-1000 J/KG...
DEEP UNIDIRECTIONAL WIND PROFILES...AND 50 KT FLOW WITHIN A FEW
THOUSAND FT OF THE GROUND WILL SUPPORT A THREAT FOR BOWS/SUPERCELLS
WITH DAMAGING WINDS AND MARGINALLY SEVERE HAIL THROUGH THE
AFTERNOON.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25055.
...THOMPSON
SEL1
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 201
NWS STORM PREDICTION CENTER NORMAN OK
1155 AM EDT SAT APR 12 2008
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
SOUTHERN MARYLAND
SOUTHEAST VIRGINIA
COASTAL WATERS
EFFECTIVE THIS SATURDAY MORNING AND EVENING FROM 1155 AM UNTIL
600 PM EDT.
HAIL TO 1.5 INCHES 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 25 MILES NORTH OF
WALLOPS VIRGINIA TO 55 MILES WEST SOUTHWEST OF NORFOLK VIRGINIA.
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...SLIGHTLY ELEVATED CONVECTION THIS MORNING IN ADVANCE OF
THE COLD FRONT WILL GRADUALLY BECOME SURFACE-BASED AS THE LOW LEVELS
DESTABILIZE VIA DAYTIME HEATING. MLCAPE VALUES OF 500-1000 J/KG...
DEEP UNIDIRECTIONAL WIND PROFILES...AND 50 KT FLOW WITHIN A FEW
THOUSAND FT OF THE GROUND WILL SUPPORT A THREAT FOR BOWS/SUPERCELLS
WITH DAMAGING WINDS AND MARGINALLY SEVERE HAIL THROUGH THE
AFTERNOON.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 25055.
...THOMPSON
Note: Click for Watch Status Reports.
WOUS64 KWNS 121551
WOU1
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH OUTLINE UPDATE FOR WS 201
NWS STORM PREDICTION CENTER NORMAN OK
1155 AM EDT SAT APR 12 2008
SEVERE THUNDERSTORM WATCH 201 IS IN EFFECT UNTIL 600 PM EDT
FOR THE FOLLOWING LOCATIONS
MDC009-019-037-039-045-047-122200-
/O.NEW.KWNS.SV.A.0201.080412T1555Z-080412T2200Z/
MD
. MARYLAND COUNTIES INCLUDED ARE
CALVERT DORCHESTER SOMERSET
ST. MARYS WICOMICO WORCESTER
VAC001-025-036-053-057-073-081-093-095-097-101-103-111-115-117-
119-127-131-133-149-159-175-181-183-193-199-550-570-595-620-650-
670-700-710-730-735-740-800-810-830-122200-
/O.NEW.KWNS.SV.A.0201.080412T1555Z-080412T2200Z/
VA
. VIRGINIA COUNTIES INCLUDED ARE
ACCOMACK BRUNSWICK CHARLES CITY
DINWIDDIE ESSEX GLOUCESTER
GREENSVILLE ISLE OF WIGHT JAMES CITY
KING AND QUEEN KING WILLIAM LANCASTER
LUNENBURG MATHEWS MECKLENBURG
MIDDLESEX NEW KENT NORTHAMPTON
NORTHUMBERLAND PRINCE GEORGE RICHMOND
SOUTHAMPTON SURRY SUSSEX
WESTMORELAND YORK
VIRGINIA INDEPENDENT CITIES INCLUDED ARE
CHESAPEAKE COLONIAL HEIGHTS EMPORIA
FRANKLIN HAMPTON HOPEWELL
NEWPORT NEWS NORFOLK PETERSBURG
POQUOSON PORTSMOUTH SUFFOLK
VIRGINIA BEACH WILLIAMSBURG
ANZ533-534-537-630-631-632-650-652-654-656-122200-
/O.NEW.KWNS.SV.A.0201.080412T1555Z-080412T2200Z/
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
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
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
ATTN...WFO...LWX...AKQ...
Note: The Aviation Watch (SAW) product is an approximation to the watch area. The actual watch is depicted by the shaded areas.
SAW1
WW 201 SEVERE TSTM MD VA CW 121555Z - 122200Z
AXIS..70 STATUTE MILES EAST AND WEST OF LINE..
25N WAL/WALLOPS VA/ - 55WSW ORF/NORFOLK VA/
..AVIATION COORDS.. 60NM E/W /4SE SBY - 48WSW ORF/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 25055.
LAT...LON 38277418 36597584 36597837 38277676
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU1.