Area Forecast Discussion
Issued by NWS Sterling, VA

Current Version | Previous Version | Text Only | 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 251339 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 939 AM EDT SAT OCT 25 2014 .SYNOPSIS... HIGH PRESSURE WILL REMAIN OVER THE REGION TODAY. A REINFORCING COLD FRONT WILL PASS THROUGH THE REGION LATE TONIGHT INTO SUNDAY BEFORE HIGH PRESSURE RETURNS FOR MONDAY. THE HIGH WILL MOVE OFF THE COAST TUESDAY AND ANOTHER COLD FRONT WILL PASS THROUGH THE AREA WEDNESDAY. && .NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
HIGH PRESSURE HAS NOSED INTO THE MID-ATLANTIC THIS MORNING AND CALM AND DRY CONDITIONS WILL PERSIST TODAY. WESTERLY WINDS WILL BECOME SOUTHWESTERLY BY AFTERNOON AND USHER IN HIGHER DEWPTS. TEMPS WILL REBOUND AFTER A CHILLY MORNING AND REACH THE UPPER 60S TO NEAR 70 NEAR THE I-95 CORRIDOR THIS AFTERNOON. PREV DISCUSSION... LATER THIS EVE...THE SRN PERIPHERY OF THE UPPER LOW WILL BE ON THE NW DOORSTEP...SLIDING A DRY COLD FRONT ACROSS THE REGION OVERNIGHT. A HANDFUL OF LIGHT SHOWERS WILL LIKELY DISSIPATE UPON REACHING THE SPINE OF THE APLCNS W/ LITTLE MORE THAN SOME LEFTOVER MID CLOUDS TO MAKE IT PAST THE HIGHER TERRAIN. OVERNIGHT LOWS WILL BE MODERATE OVERNIGHT...AS DEWPOINTS ONLY DROP INTO THE M-U40S SO TEMPS WILL STAY IN THE U40S/L50S.
-- End Changed Discussion --
&& .SHORT TERM /SUNDAY THROUGH MONDAY NIGHT/...
-- Changed Discussion --
AS THE DRY COLD FRONT SLIDES ACROSS THE REGION EARLY SUNDAY...THE RELATIVELY MOIST AIR AHEAD OF THE BOUNDARY WILL BE SWEPT OFF TO THE EAST AND REPLACED BY NOTICEABLY COLDER/DRIER AIR. SOLID NW WINDS WILL BE THE REASON...AS THE DEEP UPPER PARENT LOW DRIFTS ACROSS NEW ENGLAND AND OFF THE COAST...THE SUBSIDENCE REGION BEHIND IT WILL SWEEP THE AVERAGE CONDITIONS AND REPLACE IT W/ A DRY AND WINDY DAY. DESPITE THESE CONDITIONS...SFC TEMPS WILL STILL CLIMB BACK INTO THE U60S AND A FEW L70S. NW WINDS AROUND 20MPH AND LOW RH`S MAY LEAD TO FIRE WEATHER CONDITIONS BEING MET SUNDAY AFTERNOON. HIGH PRESSURE WILL BUILD OVERHEAD SUNDAY NIGHT...CAUSING WINDS TO DIMINISH. LIGHT WINDS...MAINLY CLEAR SKIES AND DRY CONDITIONS WILL PROVIDE A GOOD SETUP FOR RADIATIONAL COOLING. THEREFORE...MIN TEMPS SUNDAY NIGHT WILL BE CHILLY...ESPECIALLY IN SHELTERED VALLEYS AND RURAL AREAS. MIN TEMPS WILL RANGE FROM THE MID 30S IN PORTIONS OF THE SHENANDOAH VALLEY...EASTERN WEST VIRGINIA...NORTHERN MARYLAND AND THE NORTHERN AND WESTERN SUBURBS OF WASHINGTON/BALTIMORE...TO THE MID 40S IN DOWNTOWN WASHINGTON AND BALTIMORE. FROST IS POSSIBLE ACROSS MANY LOCATIONS LATE SUNDAY NIGHT AND EARLY MONDAY MORNING...ESPECIALLY NORTH AND WEST OF INTERSTATE 95. HIGH PRESSURE OVER THE REGION MONDAY MORNING WILL SHIFT TO THE COAST BY LATE IN THE DAY. A RETURN SOUTHERLY FLOW WILL DEVELOP...ALLOWING FOR MILDER CONDITIONS MONDAY AFTERNOON ALONG WITH PLENTY OF SUNSHINE. MAX TEMPS WILL RANGE FROM THE MID 60S ACROSS NORTHEASTERN MARYLAND TO THE MIDDLE 70S IN PORTIONS OF CENTRAL VIRGINIA. A SOUTHERLY FLOW WILL CONTINUE AROUND THE HIGH MONDAY NIGHT...ALLOWING FOR MILDER CONDITIONS COMPARED TO SUNDAY NIGHT. MIN TEMPS WILL RANGE FROM THE MID AND UPPER 40S ACROSS SHELTERED VALLEYS AND RURAL AREAS TO THE MIDDLE 50S IN DOWNTOWN WASHINGTON AND BALTIMORE.
-- End Changed Discussion --
&& .LONG TERM /TUESDAY THROUGH FRIDAY/... A COLD FRONT WILL APPROACH FROM THE WEST TUESDAY...BUT IT WILL REMAIN TO OUR WEST AND A SOUTHWEST FLOW AHEAD OF THIS SYSTEM WILL USHER IN UNUSUALLY WARM CONDITIONS FOR THIS TIME OF YEAR. MAX TEMPS WILL APPROACH 80 DEGREES ACROSS MANY LOCATIONS. THE COLD FRONT WILL MOVE INTO WESTERN PORTIONS OF OUR CWA TUESDAY NIGHT. CLOUDS WILL INCREASE AHEAD OF THIS SYSTEM AND THERE MAY EVEN BE A FEW SHOWERS LATE ACROSS THE POTOMAC HIGHLANDS...BUT PRECIPITATION AMOUNTS WILL BE LIGHT. THE COLD FRONT WILL MOVE THROUGH THE AREA WEDNESDAY INTO WEDNESDAY NIGHT...BRINGING THE CHANCE FOR SHOWERS. PRECIPITATION AMOUNTS WILL BE LIGHT SINCE LITTLE MOISTURE WILL BE ASSOCIATED WITH THE FRONT. HIGH PRESSURE WILL BUILD OVERHEAD FOR LATE IN THE WEEK...BRINGING A RETURN OF MORE SEASONABLE CONDITIONS. && .AVIATION /14Z SATURDAY THROUGH WEDNESDAY/... VFR CONDS THRU THE CURRENT TAF PERIOD. QUIET HIGH PRES TODAY W/ JUST A FEW PASSING CLOUDS AND A LIGHT SW WIND THIS AFTN. WINDS AGAIN BECOME THE CONCERN SUNDAY...AS SFC AND LOW LEVEL WINDS REACH THE 15-25KT RANGE RANGE - LOCALLY HIGHER. A COLD FRONT WILL USHER-IN THIS NEW WINDY DAY EARLY SUN...W/ GUSTS CONTAINING UNTIL LATER THIS EVE. VFR CONDITIONS ARE EXPECTED MOST OF THE TIME SUNDAY NIGHT THROUGH WEDNESDAY. A SOUTHERLY FLOW WILL INCREASE AHEAD OF A COLD FRONT MONDAY AND TUESDAY. WINDS WILL SHIFT TO THE NORTHWEST BEHIND THE FRONT FOR WEDNESDAY. && .MARINE...
-- Changed Discussion --
HIGH PRESSURE WILL LEAD TO LIGHT W-SW WINDS 5-10KT THIS AFTN. A QUICK- MOVING COLD FRONT WILL BE THE PRECURSOR TO ANOTHER WINDY DAY ON SUNDAY. A SCA UP FOR ALL THE WATERS STARTING JUST A COUPLE OF HRS AFT SUNRISE AND LASTING THRU THE EVE. HIGH PRESSURE OVER THE WATERS SUNDAY NIGHT WILL MOVE OFF THE COAST MONDAY THROUGH TUESDAY. A SOUTHERLY FLOW WILL DEVELOP DURING THIS TIME. A COLD FRONT WILL PASS THROUGH THE WATERS WEDNESDAY. A SMALL CRAFT ADVISORY MAY BE NEEDED FOR PORTIONS OF THE WATERS TUESDAY AND WEDNESDAY. HIGH PRESSURE WILL RETURN FOR LATE IN THE WEEK.
-- End Changed Discussion --
&& .TIDES/COASTAL FLOODING...
-- Changed Discussion --
DUE TO THE WESTERLY WINDS BECOMING SWLY BY AFTERNOON...CBOFS HAS TIDAL ANOMALIES INCREASING THIS AFTERNOON. THE FCST IS FOR ANNAPOLIS TO REACH MINOR FLOOD EARLY THIS EVENING. WILL NOT ACT ON THIS RIGHT NOW SINCE THE WESTERLY COMPONENT SHOULD KEEP ANOMALIES FROM RISING QUICKLY. AT THIS TIME ANOMALIES ARE AROUND A HALF FOOT AT ANNAPOLIS.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY FROM 9 AM TO 6 PM EDT SUNDAY FOR ANZ530>543. && $$ SYNOPSIS...BJL NEAR TERM...HAS/GMS SHORT TERM...BJL/GMS LONG TERM...BJL/GMS AVIATION...BJL/GMS MARINE...BJL/GMS TIDES/COASTAL FLOODING...HAS

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