Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 182340 AFDCTP AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 740 PM EDT FRI APR 18 2014 .SYNOPSIS... SPRAWLING HIGH ALOFT AND AT THE SURFACE OVER THE WESTERN ATLANTIC WILL SLOWLY WEAKEN OVER THE NEXT SEVERAL DAYS AS ANOTHER RIDGE OVER THE U.S. ROCKIES REACHES THE NORTHEAST LATE SATURDAY AND SUNDAY. THE RESULT IS MAINLY FAIR WEATHER WITH SURFACE RIDGING AND COLD AIR DAMMING EAST OF THE ALLEGHENIES INTO EARLY NEXT WEEK. A TROUGH IN THE NORTHERN STREAM SHOULD WEAKEN THE RIDGE AND COULD TRIGGER SHOWERS TUESDAY- WEDNESDAY BUT YET ANOTHER RIDGE MOVES IN QUICKLY BEHIND THIS SYSTEM BY NEXT THURSDAY. NEAR NORMAL TEMPERATURES ARE EXPECTED MOST OF THE PERIOD. && .NEAR TERM /UNTIL 7 AM SATURDAY MORNING/... SFC FRONT NOW BISECTS THE AREA WITH GUSTY WNW WINDS BEHIND IT. IT WILL CONTINUE TO ADVANCE SE THRU THE EVENING/NIGHT. BUT IT HAS NO MOISTURE ALONG/BEHIND IT SOUTH OF KBUF. STILL...WILL HOLD ONTO SCT SPRINKLES ACROSS THE NRN TIER COUNTIES THROUGH MIDNIGHT AS CURRENT CROP OF MID CLOUDS IN THE NW SLIDES TO THE EAST. ENOUGH UPPER FORCING MAY JOIN UP JUST AS THE FRONT PUSHES THRU POTTER/TIOGA COUNTIES TO MAKE A SHOWER PER RUC/NAM FCSTS. && .SHORT TERM /7 AM SATURDAY MORNING THROUGH 6 PM SATURDAY/... SFC HIGH WILL KEEP FAIR AND DRY CONDITIONS OVER PA THIS WEEKEND. NORTHERLY GRADIENT AND DRY AIR MASS WILL PROVIDE A MOSTLY SUNNY SATURDAY ACROSS CENTRAL PA...WITH 850 MB TEMPS IN THE +3 TO 0C RANGE...YIELDING HIGHS RANGING FROM MID 50S NORTH TO LOW TO MID 60S CENTRAL AND SOUTH AND LIGHT NLY BREEZES. && .LONG TERM /SATURDAY NIGHT THROUGH FRIDAY/... AN ACTIVE SPLIT FLOW PATTERN OVER NORTH AMERICA IS FORECAST TO EVOLVE INTO A FAIRLY WELL PHASED UPPER RIDGE OVER THE EASTERN U.S. TOWARD THE END OF THE PERIOD. THIS WILL RESULT IN LIMITED CHANCES FOR PRECIPITATION THROUGH MUCH OF THE PERIOD. AT THIS TIME THE ENSEMBLES SUGGEST THE BEST CHANCE OF RAIN IN THE NEXT WEEK WILL BE IN THE TUESDAY-WEDNESDAY TIMEFRAME. GEFS FAVORS RAIN AHEAD OF THE DEEPENING TROUGH AND FRONTAL SYSTEM MAINLY TUESDAY. BUT TIMING COULD CHANGE AND SOME CHANCE LINGERING INTO EARLY WEDNESDAY. THE COMING 7 DAYS IN GENERAL... SATURDAY NIGHT INTO SUNDAY THE REGION WILL BE DOMINATED BY A STRONG ANTICYCLONE. SHOULD BE GENERALLY FAIR DRY WEATHER. THE ANTICYCLONE WEAKENS MONDAY BUT STILL IN A RIDGE. VERY WEAK FLOW AHEAD OF THE APPROACHING FRONTAL BOUNDARY. THERE IS NO PRESSURE GRADIENT OVER MOST OF THE EASTERN UNITED STATES MONDAY IN THE GEFS OR NAEFS. A SHORTWAVE AND FRONT SHOULD TRIGGER SHOWERS AND RAIN TUESDAY INTO EARLY WEDNESDAY. TROUGH OVER A RIDGE AND NO BIG PW SURGE...NOT A BIG RAIN EVENT. HEIGHTS SHOULD DROP SLIGHTLY BELOW NORMAL WEDNESDAY AND 850 HPA TEMPS DROP TO JUST BELOW NORMAL. HEIGHTS AND TEMPERATURES REBOUND BACK TOWARD NORMAL THURSDAY AND FRIDAY COULD BE A RELATIVELY WARM DAY. UNCERTAINTY GROWS IN FORECAST AND SOME ENSEMBLE MEMBERS SHOW SURGE OF MOISTURE IN WARM AIR AHEAD OF YET ANOTHER POTENTIAL TROUGH. THE CHANCE OF RAIN SHOULD GRADUALLY INCREASE IN THE FRIDAY OR SATURDAY TIME FRAME. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
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EARLY PACKAGE BRINGS DOWN THE WINDS AS WE NEAR SUNSET. A BKN-OVC LAYER IN THE MID LEVELS REMAINS AS A WEAKENING FRONTAL BOUNDARY EXITS THE AREA. HIGHLIGHTED THIS ACROSS THE NORTHERN SITES. HIGH PRESSURE WILL BRING A NICE VFR DAY ON SATURDAY AS WINDS WILL REMAIN GENERALLY BELOW 10KT WITH CEILING AND VISIBILITY UNRESTRICTED. OUTLOOK... TONIGHT-SAT...AREAS MVFR THIS EVENING NORTHWEST...VFR ELSEWHERE. SUN-MON...NO SIG WX. TUE...SEVERAL-HOUR PERIOD OF MVFR CIGS POSS WITH BRIEF MVFR VSBYS IN SHOWERS ACCOMPANYING A COLD FRONTAL PASSAGE. WED...MVFR NORTH/WEST WITH CHC -SHRA...VFR ELSEWHERE.
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&& .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...GRUMM/DEVOIR NEAR TERM...DANGELO SHORT TERM...DANGELO/LAMBERT LONG TERM...GRUMM/GARTNER AVIATION...TYBURSKI

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