Area Forecast Discussion
Issued by NWS Sterling, VA

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000 FXUS61 KLWX 251920 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 320 PM EDT THU SEP 25 2014 .SYNOPSIS... COASTAL LOW PRESSURE WILL SLOWLY MOVE OUT TO SEA TONIGHT. GREAT LAKES HIGH PRESSURE WILL SLOWLY BUILD INTO THE REGION FRIDAY...AND REMAIN THROUGH THE WEEKEND. LOW PRESSURE WILL APPROACH THE REGION DURING THE FIRST HALF OF NEXT WEEK. && .NEAR TERM /THROUGH FRIDAY/... LOW PRESSURE WAS LOCATED OFF THE DELMARVA...AND WILL MOVE FURTHER AWAY FROM THE COAST TONIGHT. STEADY RAIN HAS GENERALLY ENDED ACROSS THE AREA...BUT POCKETS OF LIGHT RAIN AND DRIZZLE LINGER MAINLY EAST OF THE BLUE RIDGE AND WILL LIKELY PERSIST THROUGH SUNSET. LOW LEVEL MOISTURE WILL BE SLOW TO DEPART...SO CLOUDS MAY HANG AROUND THROUGH THE NIGHT. PATCHY FOG MAY FOLLOW SUIT...BUT WITH ALL THE CLOUDS ALREADY IN PLACE THAT MAY LIMIT THE EXTENT AND MAGNITUDE OF ANY FOG. IMPROVING CONDITIONS ABOUND ON FRIDAY AS DRYING OCCURS AND FLOW BECOMES INCREASINGLY ANTICYCLONIC. RESULT WILL BE A RETURN TO SUNSHINE AND TEMPERATURES HIGHER OVER TODAY/S COOL-ISH NUMBERS POSSIBLY BY 10 DEGREES /MAINLY MID 70S/. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/... RIDGE BUILDS IN FOR THE WEEKEND. THIS SHOULD PROMOTE MOSTLY CLEAR/MOSTLY SUNNY SKIES. WITH MOSTLY CLEAR SKIES AT NIGHT...TEMPERATURES WILL BE NEAR CLIMO BUT DURING THE DAYTIME ABOVE NORMAL TEMPERATURES ARE EXPECTED WITH THE POTENTIAL FOR MAXIMA ABOVE 80 IN SOME SPOTS. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... ECMWF 500MB TROUGH IN OHIO/MISSISSIPPI VALLEY SUNDAY NIGHT WILL DEVELOP INTO BRIEF CUT-OFF LOW LATE TUESDAY. LOW WILL OPEN BACK UP WEDNESDAY AND MOVE EAST OF CWA AS TROUGH THURSDAY. HIGH PRESSURE RIDGING OVER CWA WILL WEAKEN ALLOWING INCREASING CHANCES OF PRECIPITATION TO AFFECT THE MIDDLE ATLANTIC REGION MONDAY THROUGH EARLY WEDNESDAY. LATER WEDNESDAY HIGH PRESSURE WILL RETURN TO THE AREA. && .AVIATION /19Z THURSDAY THROUGH TUESDAY/... CIGS HAVE IMPROVED ABOVE IFR...BUT ARE GENERALLY STILL IN THE 1-2K FT RANGE. GRADUAL IMPROVEMENT ABOVE THE 2K FT LEVEL SHOULD OCCUR CLOSER TO SUNSET. WITH LOW LEVEL MOISTURE LINGERING...AM UNCERTAIN WHETHER VFR WILL RETURN OR NOT. EVEN IF THIS HAPPENS FOR A TIME THERE IS THE POTENTIAL FOR RE-DEVELOPMENT OF MVFR CONDITIONS OVERNIGHT/EARLY FRIDAY. HIGH PRESSURE BUILDS IN FOR FRIDAY AND REMAINS THROUGH THE WEEKEND THEN BREAKS DOWN EARLY NEXT WEEK. && .MARINE... NORTH WINDS CONTINUE OVER THE WATERS...HIGHEST DOWN THE MAIN CHANNEL OF THE BAY. SCA CONTINUES THROUGH 6 PM ALL WATERS...THEN DROPS OFF FOR THE UPPER/MIDDLE TIDAL POTOMAC RIVER WHICH SHOULD BE FINE. SCA CONTINUES INTO FRIDAY MORNING THOUGH FOR NORTH WINDS DOWN THE BAY. HIGH PRESSURE BUILDS IN THIS WEEKEND AND NO FLAGS ARE EXPECTED. LOW PRESSURE MAY AFFECT THE AREA EARLY NEXT WEEK. && .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 10 AM EDT FRIDAY FOR ANZ530>534-537- 539>541-543. SMALL CRAFT ADVISORY UNTIL 6 PM EDT THIS EVENING FOR ANZ535- 536-538-542. && $$ SYNOPSIS...BPP NEAR TERM...BPP SHORT TERM...BPP LONG TERM...CEM AVIATION...BPP/CEM MARINE...BPP/CEM

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