Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 281438 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 938 AM EST FRI NOV 28 2014 .SYNOPSIS... HIGH PRESSURE WILL BUILD IN FROM THE WEST TODAY...THEN WILL MOVE OFF THE COAST ON SATURDAY. A WARM FRONT IS EXPECTED TO LIFT TO THE NORTH SATURDAY NIGHT. A COLD FRONT WILL THEN FOLLOW ON MONDAY. && .NEAR TERM /THROUGH TONIGHT/... THE UPPER-LEVEL TROUGH IS MOVING OFF TO OUR EAST WHILE HIGH PRESSURE APPROACHES FROM THE OHIO VALLEY. A FEW FLURRIES AND SNOW SHOWERS ARE STILL OCCURRING DUE TO THE COLD ADVECTION FROM THE NORTHWEST FLOW. HOWEVER...ANY ACCUMULATING SNOW WILL LIKELY BE CONFINED TO LOCATIONS ALONG AND WEST OF THE ALLEGHENY FRONT WHERE AN UPSLOPE COMPONENT TO THE LOW-LEVEL FLOW WILL ADD TO THE COVERAGE OF SNOW SHOWERS. HAVE EXTENDED THE WINTER WEATHER ADVISORY UNTIL 1 PM THIS AFTERNOON FOR THESE AREAS. ANY SHOW SHOWERS WILL QUICKLY END THIS AFTERNOON AS HIGH PRESSURE BUILDS IN FROM THE WEST. HOWEVER...IT WILL REMAIN QUITE CHILLY WITH MAX TEMPS RANGING FROM THE 20S ACROSS THE MTNS...TO THE MID 30S NEAR THE MD/PA BORDER...TO THE LOW 40S IN SOUTHERN MD. HIGH PRESSURE WILL MOVE OVERHEAD TONIGHT LEADING TO DRY AND CALM CONDITIONS. FCST MIN TEMPS WITH BE IN THE 20S. && .SHORT TERM /SATURDAY THROUGH SUNDAY/... SHORTWAVE IN W/NW MID-LEVEL FLOW LOOKS TO STAY FAR ENOUGH NORTH TO KEEP PRECIP UP IN PA SATURDAY MORNING. SREFS SUPPORTS THIS IDEA AND THUS HAVE A DRY FORECAST. 00Z GFS TRIES TO SPREAD A LITTLE QPF SOUTH OF THE MASON DIXON LINE /IT WOULD BE IN THE FORM OF SNOW/ SO BEARS WATCHING BUT FEEL THAT QPF IS JUST A TAD TOO FAR SOUTH FROM THE GFS. WITH SURFACE HIGH OFFSHORE...WARM ADVECTION CONTINUES THROUGH THE WEEKEND. WARM FRONT LOOKS TO LIFT TO THE NORTH SATURDAY NIGHT OR EARLY SUNDAY MORNING. IN THE WAKE OF ITS PASSAGE MAXIMA LIKELY ARE ABLE TO RISE INTO THE MID TO UPPER 50S FOR MUCH OF THE CWA. SOUTHEAST PORTIONS OF THE CWA SHOULD SEE SOME SUNSHINE BUT CLOUDS ARE LIKELY TO BE STUBBORN ACROSS THE NORTHWEST CWA AND THERE WILL ALSO BE A CHANCE OF RAIN SHOWERS. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... ABOVE NORMAL TEMPERATURES CONTINUE ON MONDAY...LIKELY A FEW DEGREES HIGHER OVER SUNDAY/S MAXIMA. THERE WILL BE A COLD FRONT APPROACHING IN THE MORNING...MOVING THROUGH IN THE AFTERNOON AND EVENING. MOISTURE IS NOT IMPRESSIVE...NEVERTHELESS THERE WILL BE LOW POPS IN THE FORECAST FOR RAIN SHOWERS MOST ESPECIALLY OUT WEST TOWARD THE POTOMAC HIGHLANDS. FRONT WINDS UP IN THE CAROLINAS ON TUESDAY AS HIGH PRESSURE BUILDS IN FROM THE NORTH. COLDER AIR MOVES IN FOR TUESDAY. FRONT MAY ALSO BE QUICK TO RETURN NORTH AS A WARM FRONT TUESDAY NIGHT INTO WEDNESDAY BRINGING A CHANCE OF PRECIPITATION AGAIN. && .AVIATION /15Z FRIDAY THROUGH TUESDAY/... VFR CONDITIONS ARE EXPECTED TODAY AND TONIGHT. NORTHWEST FLOW WILL CONTINUE TODAY. NW WINDS WILL GUST AROUND 20 KNOTS THROUGH THIS AFTERNOON. HIGH PRESSURE MOVES OVERHEAD TONIGHT AND WINDS WILL BECOME SOUTHERLY BY SAT MORNING. HIGH PRESSURE BUILDS IN FOR FRIDAY THEN MOVES OFFSHORE FOR THE WEEKEND. NO SIGNIFICANT WX IS EXPECTED. A COLD FRONT WILL MOVE THROUGH LATER MONDAY. && .MARINE... NORTHWEST FLOW WILL CONTINUE ON THE WATERS THROUGH THIS AFTERNOON. A SMALL CRAFT ADVISORY REMAINS IN EFFECT FOR ALL OF THE WATERS TODAY. HIGH PRESSURE MOVES OVERHEAD TONIGHT AND WINDS WILL BECOME SW-S BY SAT MORNING SOUTHERLY WINDS MAY GET CLOSE TO SCA CRITERIA UP THE CHESAPEAKE BAY LATER SATURDAY AFTERNOON BUT CONFIDENCE TOO LOW TO ISSUE SCA ATTM. SEEMS MORE LIKELY SATURDAY EVENING INTO THE NIGHT. COLD FRONT MOVES THROUGH LATE MONDAY...POSSIBLY A NORTHERLY SURGE MAY PROMOTE SCA CONDITIONS MONDAY NIGHT. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...WINTER WEATHER ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR MDZ501. VA...WINTER WEATHER ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR VAZ503. WV...WINTER WEATHER ADVISORY UNTIL 1 PM EST THIS AFTERNOON FOR WVZ501-503-505. MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EST THIS EVENING FOR ANZ530>543. && $$ SYNOPSIS...BPP/HAS NEAR TERM...BJL/HAS SHORT TERM...BPP LONG TERM...BPP AVIATION...BJL/BPP/HAS MARINE...BJL/BPP/HAS

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.