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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KLWX 101423
AFDLWX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
923 AM EST TUE DEC 10 2013

.SYNOPSIS...
A POTENT UPPER-LEVEL DISTURBANCE WILL PASS THROUGH THE REGION
TODAY. ARCTIC HIGH PRESSURE WILL BUILD OVERHEAD TONIGHT THROUGH
THE END OF THE WEEK. LOW PRESSURE MAY IMPACT THE REGION THIS
WEEKEND.

&&

.NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
UPDATE TO DOWNGRADE THE WINTER STORM WARNING TO A WINTER WEATHER
ADVISORY FOR WASHINGTON DC AND BALTIMORE. THE HEAVIEST SNOW HAS
MOVED AWAY FROM THE AREA. ADDITIONAL SNOWFALL ACCUMULATIONS UP TO
ONE INCH ARE POSSIBLE.

THE UPPER-LEVEL DISTURBANCE THAT HAS PRODUCED THE SNOW THIS
MORNING IS STARTING TO MOVE AWAY FROM THE AREA. DRIER AIR WILL
CONTINUE TO WORK ITS WAY IN FROM THE WEST...CAUSING SNOW TO END BY
EARLY AFTERNOON. WINTER WEATHER HEADLINES REMAIN IN EFFECT FOR THE
SNOW LATE THIS MORNING...BUT ADDITIONAL SNOW ACCUMULATIONS WILL BE
AROUND AN INCH OR LESS SINCE THE HEAVIER SNOW BANDS HAVE MOVED OUT
OF OUR AREA.

HIGH PRESSURE WILL APPROACH THE AREA LATE THIS
AFTERNOON...BRINGING DRY CONDITIONS AND THERE MAY EVEN BE SOME
BREAKS OF SUN LATE IN THE DAY. MAX TEMPS WILL RANGE FROM THE 20S
IN THE MOUNTAINS TO THE LOWER AND MIDDLE 30S ELSEWHERE.
-- End Changed Discussion --

&&

.SHORT TERM /6 PM THIS EVENING THROUGH WEDNESDAY NIGHT/...
-- Changed Discussion --
MIN TEMPS WILL TURN OUT QUITE COLD TONIGHT...CAUSING ANY SLUSHY
OR WET ROADS TO FREEZE. HIPRES BLDS TNGT...WL BE ARND THRU WED
NGT. SUBSIDENCE INCREASES RAPIDLY...PROVIDING ONLY A SMALL WINDOW
FOR UPSLP SHSN THIS EVNG. OTRW...MOCLR SKIES AND CAA DOMINATE THE
PD. TOOK MOS BLEND FOR TEMPS.
-- End Changed Discussion --

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
A LONG WAVE TROUGH SHOULD MOVE OFF THE EAST COAST FRIDAY AS HIGH
PRESSURE MOVES TO OUR SOUTH. A SLIGHT RELIEF IN TEMPERATURES IS
EXPECTED SATURDAY AS RETURN FLOW BRINGS TEMPS IN THE 40S INTO THE
REGION. A COLORADO LOW IS EXPECTED TO FORM MID WEEK AND TRAVEL CLOSE
TO THE GULF STATES BEFORE MAKING A TURN UP THE TN VALLEY AND TOWARDS
THE MID ATLANTIC. BOTH THE GFS AND ECMWF ARE ON BOARD WITH THIS
TREND AND A WINTRY MIX IS EXPECTED AS IT APPROACHES THE MID
ATLANTIC. PTYPE AND TIMING SPECIFICS ARE STILL IN QUESTION. LOW
PRESSURE MOVES TOWARDS NEW ENGLAND SUNDAY AND BREEZY COOLER
CONDITIONS ARE EXPECTED FOR THE MID ATLANTIC.

&&

.AVIATION /14Z TUESDAY THROUGH SATURDAY/...
-- Changed Discussion --
VSBY AND CIG RESTRICTIONS FROM SNOW WILL GRADUALLY IMPROVE LATE
THIS MORNING AND EARLY AFTERNOON.

VFR TNGT-FRI UNDER HIPRES. DIMINISHED CIGS/VSBYS PSBL SAT AHD OF
THE NEXT SYSTEM TO IMPACT THE RGN.
-- End Changed Discussion --

&&

.MARINE...
WNDS BLO 10 KT ATTM. MIXING REMAINS POOR THRU THE DAY. HWVR...AS A
DISTURBANCE GLIDES BY...PROVIDING A PD OF SNOW...PERHAPS MIXED W/ PL
AND A LTL RA IN THE MID BAY...SOME GDNC SUGGESTING WNDS WL PICK UP.
HV NOT FLLWD THAT SOLN ATTM...AND HV CAPPED WNDS AT 15 KT. WL NEED
TO MONITOR IN CASE A SCA REQD.

IN THE WAKE OF THE LOW...COLD AIR WL STREAM IN...PROVIDING A SETUP
FOR MORE FVRBL MIXING. WL KEEP SCA IN PLACE TNGT. WNDS DIMINISH FOR
WED UNDER HIPRES...WHICH WL BE ARND THRU FRI. A DISTURBANCE MOVE
INTO OVR THE WATERS SAT.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
DC...WINTER WEATHER ADVISORY UNTIL 2 PM EST THIS AFTERNOON FOR
     DCZ001.
MD...WINTER WEATHER ADVISORY UNTIL 2 PM EST THIS AFTERNOON FOR
     MDZ011-013-014-016>018-501-502.
     WINTER STORM WARNING UNTIL 2 PM EST THIS AFTERNOON FOR
     MDZ003>007-009-010.
VA...WINTER WEATHER ADVISORY UNTIL 2 PM EST THIS AFTERNOON FOR
     VAZ025-026-036>039-050>057-502>504.
     WINTER STORM WARNING UNTIL 2 PM EST THIS AFTERNOON FOR
     VAZ027>031-040-042-501.
WV...WINTER WEATHER ADVISORY UNTIL 2 PM EST THIS AFTERNOON FOR
     WVZ050-051-055-501>506.
     WINTER STORM WARNING UNTIL 2 PM EST THIS AFTERNOON FOR WVZ052-
     053.
MARINE...SMALL CRAFT ADVISORY FROM 6 PM THIS EVENING TO 6 AM EST
     WEDNESDAY FOR ANZ530>543.
-- End Changed Discussion --

&&

$$
SYNOPSIS...HTS
NEAR TERM...BJL
SHORT TERM...HTS
LONG TERM...HAS
AVIATION...HTS/BJL
MARINE...HTS/BJL