FXUS61 KLWX 191820
AFDLWX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
220 PM EDT WED JUN 19 2013

.SYNOPSIS...
HIGH PRESSURE OVER THE GREAT LAKES WILL BUILD INTO THE MID-
ATLANTIC TONIGHT THEN MOVES OFFSHORE THROUGH THE END OF THE WEEK.
HIGH PRESSURE WILL REMAIN OFFSHORE OVER THE WEEKEND...THEN A COLD
FRONT MAY APPROACH DURING THE EARLY TO MIDDLE PORTION OF NEXT
WEEK. 

&&

.NEAR TERM /THROUGH TONIGHT/...
HAVE A FEW SHOWERS POPPING UP ACROSS THE CENTRAL SHENANDOAH VALLEY 
AND POTOMAC HIGHLANDS EARLY THIS AFTERNOON...MAYBE EVEN A FEW
SPRINKLES INTO THE VIRGINIA PIEDMONT. DEWPOINTS WERE STILL IN THE
60S IN THIS AREA. BUT NORTHERLY WINDS BEHIND A COLD FRONT WERE
BRINGING LOWER DEWPOINTS IN THE 50S CLOSER TO THE MASON DIXON
LINE. THESE LOWER DEWPOINTS WILL SPREAD SOUTH THROUGH THE REST OF
THE AFTERNOON AND EVENING...AND ANY ISOLATED CONVECTION ACROSS THE
SOUTH/SOUTHWEST PORTION OF THE CWA WILL DISSIPATE.

HIGH PRESSURE OVER THE GREAT LAKES BUILDS OVER THE NORTHEAST AND 
MID-ATLANTIC TONIGHT. CLOUDS FROM THIS AFTERNOON WILL BREAK UP AND 
THE SKY WILL CLEAR OUT THIS EVENING...PAVING THE WAY FOR RADIATIONAL 
COOLING AND COOLER TEMPERATURES TONIGHT. 

&&

.SHORT TERM /THURSDAY THROUGH FRIDAY/...
HIGH PRESSURE MOVES OFF THE COAST DURING THE DAYTIME THURSDAY. 
ATMOSPHERE REMAINS RELATIVELY DRY. WITH LIGHT FLOW..CAN/T RULE OUT 
ISOLATED SHOWERS OR THUNDERSTORMS IN THE AFTERNOON OVER THE HIGHER 
TERRAIN OTHERWISE DRY CONDITIONS WITH SUNSHINE CAN BE EXPECTED.

HIGH PRESSURE REMAINS OFF THE COAST ON FRIDAY. FRIDAY LOOKS TO BE A 
SIMILAR DAY TO THURSDAY...WITH MOSTLY SUNNY SKIES AND A SMALL CHANCE 
OF AFTERNOON CONVECTION FIRING OVER THE MOUNTAINS. TEMPERATURES WILL 
MODERATE TO NEAR NORMAL.

&&

.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
HIGH PRESSURE REMAINS OFF THE COAST OVER THE WEEKEND...WITH MOISTURE 
GRADUALLY INCREASING ON SOUTHERLY FLOW. THERE MAY BE MORE CLOUDS 
LATER IN THE WEEKEND...BUT WEAK FORCING MEANS THAT ANY DIURNAL
CONVECTION MAY STILL BE RELEGATED TO THE HIGHER TERRAIN.
TEMPERATURES ARE EXPECTED TO WARM TO ABOVE NORMAL THIS
WEEKEND...WITH MAXIMA NEAR 90 ON SUNDAY.

WARM WEATHER IS EXPECTED TO CONTINUE INTO EARLY NEXT WEEK. THERE ARE 
SIGNS OF HIGH PRESSURE WEAKENING AND SHORTWAVE ENERGY AFFECTING THE 
AREA AT SOME POINT IN TIME. THERE IS SOME UNCERTAINTY WITH REGARD TO 
TIMING...SO WILL STICK WITH HPC 20-30 POPS DURING THIS TIME.

&&

.AVIATION /18Z WEDNESDAY THROUGH MONDAY/...
CLOUDS WILL SCATTER THROUGH LATE AFTERNOON...WITH THE POTENTIAL FOR 
CLEARING SKIES OCCURRING LATE TONIGHT. MVFR FOG POSSIBLE AT CHO/MRB 
LATE AT NIGHT...OTHERWISE VFR FOR THE VALID TAF PERIOD. 

HIGH PRESSURE WILL BRING MOSTLY QUIET WEATHER LATE IN THE WEEK INTO 
THE WEEKEND. 

&&

.MARINE...
SCA HAS BEEN CANCELLED AS N/NE WINDS HAVE DIMINISHED. HIGH PRESSURE 
BUILDS IN LATE TONIGHT AND THEN MOVES OFF THE COAST FOR THE END OF 
THE WEEK. HIGH PRESSURE LOOKS TO REMAIN OFFSHORE OVER THE WEEKEND AS 
WELL. AM NOT EXPECTING SCA CONDITIONS DURING THIS TIME. 

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...NONE.
MD...NONE.
VA...NONE.
WV...NONE.
MARINE...NONE.

&&

$$
BPP