Area Forecast Discussion
Issued by NWS Sterling, VA

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000
FXUS61 KLWX 271214 AAA
AFDLWX

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC
714 AM EST TUE JAN 27 2015

.SYNOPSIS...
STRONG LOW PRESSURE WILL CONTINUE TO TRACK NORTHEAST OFF THE NEW
ENGLAND COAST THROUGH TONIGHT. HIGH PRESSURE WILL BUILD OVERHEAD
WEDNESDAY BEFORE A CLIPPER SYSTEM PASSES THROUGH LATER THURSDAY
INTO THURSDAY NIGHT. HIGH PRESSURE WILL RETURN FOR FRIDAY INTO
SATURDAY. LOW PRESSURE MAY IMPACT THE AREA BY SUNDAY.

&&

.NEAR TERM /THROUGH TONIGHT/...
UPDATE...EXPIRED THE WINTER STORM WARNING AND ADVISORY FOR THE WRN
ZONES OF THE CWA - THE APLCNS AND POTOMAC HIGHLAND REGIONS. THE
ADVISORY REMAINS IN EFFECT THRU 10 FOR THE REMAINDER OF THE AREA -
FROM THE NRN SHEN VLY TO THE WRN SHORE OF THE CHES BAY.

FROM PREV DISC...
INTENSE COASTAL LOW PRESSURE SYSTEM WILL CONTINUE TO PULL AWAY
FROM THE MIDDLE ATLANTIC REGION TODAY. BANDS OF LIGHT SNOW WILL
CONTINUE TO IMPACT AREAS MAINLY TO THE EAST OF THE BLUE RIDGE
MOUNTAINS. ENERGY FROM A NEGATIVE TILT UPPER TROUGH TO THE WEST
WILL KEEP LIGHT SNOW BANDS GOING FOR A FEW MORE HOURS AND WILL
PRODUCE AN ADDITIONAL HALF INCH TO ONE INCH OF SNOW IN SPOTS. WILL
KEEP ALL WARNINGS AND ADVISORIES IN PLACE EARLY THIS MORNING.
FALLING SNOW AND SUB FREEZING TEMPERATURES WILL CREATE SLIPPERY
TRAVEL. THE UPPER TROUGH AND ASSOCIATED ENERGY WILL PULL INTO
SOUTHERN NEW ENGLAND LATER TODAY WITH ANY LIGHT SNOW SHOWERS OR
FLURRIES COMING TO AN END. A FEW LIGHT SNOW SHOWERS WILL HANG ON
OVER THE WESTERN SLOPES OF THE ALLEGHENY FRONT BUT SHOULD NOT
AMOUNT TO VERY MUCH DURING TODAY.

GUSTY NORTHWEST WINDS AND COLD TEMPERATURES WILL FOLLOW FOR TODAY.
WINDS WILL AVERAGE 15 TO 20 MPH WITH GUSTS OF 20 TO 25
MPH...SLIGHTLY HIGHER OVER THE RIDGETOPS. THIS COMBINED WITH HIGH
TEMPERATURES STRUGGLING TO REACH THE UPPER 20S TO MIDDLE 30S WILL
CREATE WIND CHILL VALUES IN THE TEENS AND 20S IN MOST LOCATIONS.

A COLD AIRMASS WILL SETTLE OVER THE REGION TONIGHT. OVERNIGHT LOWS
WILL FALL BACK INTO THE SINGLE DIGITS OUT WEST TO THE TEENS TO LOWER
20S EAST. BREEZY NORTHWEST WINDS WILL REDUCE WIND CHILLS INTO THE
SINGLE DIGITS OVERNIGHT.

&&

.SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/...
HIGH PRESSURE WILL BUILD INTO THE MIDDLE ATLANTIC REGION ON
WEDNESDAY BRINGING A RETURN TO SUNSHINE AND LESS WIND. TEMPERATURE
WILL BE SLOW TO RISE AS COLD AIR REMAINS IN PLACE. AFTERNOON HIGH
TEMPERATURES WILL ONLY REACH THE UPPER 20S OVER THE NORTH AND WEST
TO THE MIDDLE AND UPPER 30S EAST.

HIGH PRESSURE WILL BUILD OVERHEAD WEDNESDAY NIGHT...BRINGING DRY
AND COLD CONDITIONS. WENT A FEW DEGREES BELOW GUIDANCE WITH THE
MIN TEMPS DUE TO RADIATIONAL COOLING WITH DRY CONDITIONS AND LIGHT
WINDS. MIN TEMPS WILL RANGE FROM THE SINGLE DIGITS AND LOWER TEENS
ACROSS NORTHERN MARYLAND...TO THE LOWER AND MIDDLE 20S IN
WASHINGTON AND BALTIMORE.

&&

.LONG TERM /THURSDAY THROUGH MONDAY/...
HIGH PRESSURE WILL MOVE OFF THE COAST THURSDAY MORNING. A CLIPPER
SYSTEM WILL MOVE INTO THE AREA THURSDAY AFTERNOON BEFORE PASSING
THROUGH THURSDAY EVENING. A PERIOD OF WINTRY PRECIPITATION IS
POSSIBLE DURING THIS TIME. HIGH PRESSURE WILL BUILD TOWARD THE
REGION FRIDAY. GUSTY NORTHWEST WINDS ARE EXPECTED AHEAD OF THIS
SYSTEM AND IT WILL BE QUITE COLD. HIGH PRESSURE WILL BUILD
OVERHEAD FRIDAY NIGHT AND SATURDAY. WINDS WILL GRADUALLY DIMINISH
BUT IT WILL REMAIN COLD.

LOW PRESSURE MAY IMPACT THE AREA SUNDAY AND MONDAY...BRINGING A
CHANCE FOR WINTRY PRECIPITATION. DETAILS ARE HIGHLY UNCERTAIN THIS
FAR OUT.

&&

.AVIATION /12Z TUESDAY THROUGH SATURDAY/...
MVFR TO LOCALLY IFR CONDITIONS WILL PERSIST IN LOW CIGS AND VSBY
RESTRICTIONS DUE TO SNOW BANDS. CIGS AND VSBYS WILL LIFT TO VFR
LATER TODAY AS LOW PRESSURE PULLS AWAY FROM THE REGION. VFR
CONDITIONS ARE EXPECTED TONIGHT AND WEDNESDAY.

VFR CONDITIONS ARE EXPECTED WEDNESDAY NIGHT THROUGH THURSDAY
MORNING. A CLIPPER SYSTEM MAY BRING SOME WINTRY PRECIPITATION AND
SUBVFR CONDITIONS THURSDAY AFTERNOON INTO THURSDAY EVENING. GUSTY
NORTHWEST WINDS ARE EXPECTED BEHIND THIS SYSTEM FRIDAY...BUT HIGH
PRESSURE WILL BUILD OVERHEAD FRIDAY NIGHT INTO SATURDAY.

&&

.MARINE...
WINDS HAVE NOT INCREASED MUCH OVERNIGHT AND THEREFORE HAVE CANCELLED
THE GALE WARNING AND REPLACED IT WITH A SMALL CRAFT ADVISORY FOR
TODAY. WIND GUSTS ON THE WATERS WILL REACH 25 TO 30 KTS AS LOW
PRESSURE PULLS AWAY TO THE NORTHEAST AND HIGH PRESSURE BUILDS TOWARD
THE MIDDLE ATLANTIC. THE GRADIENT WILL BE SLOW TO RELAX AND SCA
CONDITIONS WILL BE POSSIBLE INTO EARLY WEDNESDAY.

HIGH PRESSURE WILL BUILD OVER THE WATERS WEDNESDAY NIGHT. A CLIPPER
SYSTEM WILL PASS THROUGH THE WATERS LATER THURSDAY INTO THURSDAY
NIGHT. A SMALL CRAFT ADVISORY MAY BE NEEDED FOR PORTIONS OF THE
WATERS DURING THIS TIME. HIGH PRESSURE WILL BUILD TOWARD THE
WATERS FRIDAY.

HIGH PRESSURE WILL BUILD TOWARD THE WATERS FRIDAY...BUT GUSTY
NORTHWEST WINDS ARE EXPECTED AHEAD OF THIS SYSTEM. A SMALL CRAFT
ADVISORY WILL LIKELY BE NEEDED AND A GALE WARNING MAY BE NEEDED
FOR PORTIONS OF THE WATERS DURING THIS TIME. GUSTY WINDS WILL
CONTINUE INTO FRIDAY. GUSTY WINDS WILL CONTINUE INTO FRIDAY NIGHT
BEFORE HIGH PRESSURE BUILDS OVERHEAD SATURDAY.

&&

.LWX WATCHES/WARNINGS/ADVISORIES...
DC...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR
     DCZ001.
MD...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR
     MDZ003>006-011-013-014-016>018-503>508.
VA...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR
     VAZ028-031-039-040-050>057-501-502-505-506.
WV...WINTER WEATHER ADVISORY UNTIL 10 AM EST THIS MORNING FOR
     WVZ051>053.
MARINE...SMALL CRAFT ADVISORY UNTIL 6 AM EST WEDNESDAY FOR ANZ530>543.

&&

$$
UPDATE...GMS
PREV DISCUSSION...KRW/BJL







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