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
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KLWX 201852 AFDLWX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE BALTIMORE MD/WASHINGTON DC 252 PM EDT WED MAY 20 2015 .SYNOPSIS...
-- Changed Discussion --
LOW PRESSURE PASSES TO THE SOUTH THURSDAY WITH HIGH PRESSURE BUILDING IN FOR THE WEEKEND.
-- End Changed Discussion --
&& .NEAR TERM /THROUGH THURSDAY/...
-- Changed Discussion --
INCREASING HIGH CLOUDS THIS EVENING ESPECIALLY NORTHERN MD. OTHERWISE...CLEAR SKIES EXPECTED UNDER HIGH PRESSURE. LOW PRESSURE ALONG A STATIONARY FRONT STRETCHING FROM TN TO THE CAROLINAS WILL GET BETTER ORGANIZED TONIGHT AND MOVE EAST AND OFF OF THE CAROLINAS BY THU EVENING. LIGHT RAIN WILL DEVELOP NORTH OF THE LOW PRES CENTER AND ALONG AN INVERTED SFC TROF AND OVERSPREAD THE REGION LATE TONIGHT AND CONTINUE THRU THU MORNING BEFORE IT BEGINS TO TAPER OFF IN THE AFTERNOON.
-- End Changed Discussion --
&& .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY NIGHT/...
-- Changed Discussion --
SFC LOW NEAR THE CAROLINA COAST BY 00Z FRIDAY...PUSHING OFFSHORE OVERNIGHT THURS. UPPER LVL FORCING THAT HAD AIDED IN PCPN DEVELOPMENT DURING THE DAY THURS WILL PUSH EAST AS WELL...ALLOWING PCPN TO TAPER OFF FROM WEST TO EAST BY THE SECOND HALF OF THE NIGHT. OVERNIGHT LOWS GENERALLY IN THE 40S AS CLEARING IS EXPECTED WITH DRIER AIR FILTERING IN. MAINLY DRY WX FRIDAY. UPPER LVL TROUGH SWINGS A COLD FRONT THRU MIDDAY...BUT WITH MOISTURE LACKING...NOT ANTICIPATING MUCH PCPN TO ACCOMPANY THE FRONT. KEPT JUST SLIGHT CHC OVER NW PORTIONS FOR TERRAIN CIRCULATION DEVELOPMENT WITH DIURNAL HEATING. ANY PCPN ENDS BY EVENING. SFC HIGH PRESSURE AND RIDGING ALOFT WILL LEAD TO DRY CONDITIONS HEADING INTO THE WEEKEND. HIGHS ON FRI NEAR SEASONAL WITH CAA BEHIND THE COLD FRONT DROPPING TEMPS FURTHER INTO THE 40S FOR FRI NIGHT. PATCHY FROST MAY BE PSBL IN EXTREME WESTERN POTOMAC HIGHLANDS WITH TEMPS DROPPING INTO THE 30S...THOUGH MOISTURE MIGHT BE TOO LACKING FOR FORMATION.
-- End Changed Discussion --
&& .LONG TERM /SATURDAY THROUGH WEDNESDAY/...
-- Changed Discussion --
PLEASANT WEATHER CONDITIONS ARE EXPECTED FOR SAT AND SUN WITH HIGH TEMPS IN THE 70S TO LOW 80S AS HIGH PRES MOVES OVER THE MID-ATLANTIC ON SAT AND THEN OFFSHORE SUN MORNING. A WARM FRONT LIFTS NORTH ON SUN NIGHT INTO MON BRINGING A SLIGHT CHANCE OF SHOWERS AND TSTMS. UPPER RIDGE AND BERMUDA HIGH SETTLE OVER THE REGION WITH HOT AND HUMID CONDITIONS FOR THE REGION...SO HAVE KEPT CHANCES FOR SHOWERS AND TSTMS FOR TUES... HIGH TEMPS COULD REACH THE 90S. SURFACE TROUGH KEEPS INSTABILITY OVER THE CWA FOR WED.
-- End Changed Discussion --
&& .AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
-- Changed Discussion --
LIGHT RAIN WILL OVERSPREAD AREA TERMINALS LATE TONIGHT AND CONTINUE THROUGH THU MORNING WITH PREDOMINANT MVFR CONDITIONS AT ALL TERMINALS XCPT KCHO WHERE IFR CONDITIONS ARE LIKELY. MVFR CIGS INITIALLY THURS EVENING WITH LINGERING PCPN...BCMG VFR BY THE LATTER HALF OF THE NIGHT. VFR CONDITIONS THEN FRI-FRI NIGHT WITH NW GUSTS UP TO 20 KTS PSBL FRI AFTN. VFR CONDITIONS EXPECTED FOR SAT AND SUN.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
SUB SCA CONDITIONS EXPECTED THROUGH THU. SUB-SCA MOST OF THURS NIGHT...WITH PSBL GUSTS TO 20 KTS OVER THE CHESAPEAKE BAY BY FRI MORNING. INCRSG NW WINDS BEHIND COLD FRONT DURING THE DAY SHOULD RESULT IN SCA GUSTS. HIGH PRESSURE BUILDING IN FRI NIGHT WILL DIMINISH WINDS BACK TO SUB-SCA CONDITIONS. SUB-SCA CONDITIONS EXPECTED FOR SAT AND SUN.
-- End Changed Discussion --
&& .LWX WATCHES/WARNINGS/ADVISORIES... DC...NONE. MD...NONE. VA...NONE. WV...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 5 PM EDT THIS AFTERNOON FOR ANZ530>543. && $$ SYNOPSIS...RCM/LFR NEAR TERM...LFR SHORT TERM...SEARS LONG TERM...IMR AVIATION...LFR/SEARS/IMR MARINE...LFR/SEARS/IMR

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