Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 170840 AFDCTP AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 440 AM EDT WED SEP 17 2014 .SYNOPSIS... A STRONG TROUGH OVER EASTERN NORTH AMERICA WILL SLOWLY WEAKEN FRIDAY INTO SATURDAY BEFORE RE-INTENSIFYING SUNDAY INTO MONDAY. OVERALL IT SHOULD BE A RELATIVELY COOL DRY PERIOD WITH A BRIEF WARM UP OVER THE WEEKEND. && .NEAR TERM /UNTIL NOON TODAY/...
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WEAK HIGH PRESSURE OVER THE REGION THIS MORNING HAVE ALLOWED MANY AREAS TO CALL RAPIDLY. A PATCH OF LOW CLOUDS HAS CAUSED SOME TEMPERATURES TO RISE IN CENTRAL AREAS. SEVERAL LOCATIONS IN THE NORTHERN MOUNTAINS WERE IN THE MID 30S AND PATCHY FROST IS LIKELY IN COLDER VALLEYS. THE PATCHY CLOUDS HAVE CAUSED SOME TEMPERATURES TO RISE IN NEAR 50 IN CENTRAL AREAS. MOST AREAS WITH CLEAR SKIES WERE IN THE 40S IN THE SOUTHERN AREAS. PATCHY CLOUDS KEPT TEMPERATURES IN THE 50S OVER MOST OF LANCASTER COUNTY. PATCH FOG SETTLED INTO THE SEVERAL VALLEYS. THE FOG AND LOW CLOUDS SHOULD BURN OFF THIS MORNING. MOST AREAS WILL BE MOSTLY SUNNY BY LATE MORNING.
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&& .SHORT TERM /NOON TODAY THROUGH 6 PM THURSDAY/...
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SHOULD BE A NICE AFTERNOON WEDNESDAY TEMPERATURES MAINLY IN THE 60S WITH SOME READINGS IN THE LOW 70S IN THE SOUTHEAST. MOSTLY SUNNY SKIES. THE WEAK HIGH MOVES TO OUR EAST AS AND A FRONT APPROACHES AHEAD OF A STRONGER ANTICYCLONE FORECAST TO MOVE ACROSS THE GREAT LAKES OVERNIGHT TONIGHT INTO THURSDAY. THE FRONT IS WEAK BUT HAS SOME VERY COLD DRY AIR BEHIND IT. IT WILL LIKELY INCREASE THE CLOUDINESS BUT ONLY A FEW SREF MEMBERS IMPLY VERY LIGHT QPF AMOUNTS...AND THE SREF HAS A WET BIAS. SHOULD BE A DRY FRONTAL PASSAGE OVER MOST OF THE REGION. AFTER A RELATIVELY WARM DAY IT SHOULD BE A COOLER AND DRIER EVENING.
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&& .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/...
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OVERNIGHT THURSDAY INTO FRIDAY A STRONG ANTICYCLONE PASSES JUST TO OUR NORTH. THE PW SHOULD BE ABOUT -1 SIGMA BELOW NORMAL WITH 850 HPA TEMPERATURES ABOUT -1 SIGMA BELOW NORMAL. THIS COULD PRODUCE A WIDESPREAD FROST AND POTENTIAL FREEZE IN THE NORTHERN MOUNTAINS. THE HIGH RETREATS TO OUR EAST FRIDAY INTO SATURDAY. TEMPERATURES SHOULD REBOUND NICELY FRIDAY. IT WILL BE DRY. THIS MAY SET UP COLD AIR DAMMING SITUATION SATURDAY. PATCHY FOG AND LOW CLOUDS POSSIBLE FRIDAY NIGHT INTO SATURDAY. IT WILL NOT BE NEARLY AS COLD SATURDAY MORNING. MOISTURE FROM THE WESTERN SYSTEMS WILL BE TO OUR WEST ALONG WITH A SURGE OF 1 SIGMA ABOVE NORMAL PW VALUES. AT THIS TIME THE RETREATING HIGH AND DRY AIR SHOULD KEEP THE SHOWER ACTIVITY TO OUR WEST...OVER THE GREAT LAKES. AT THIS TIME...WHAT IS LEFT OF THE MOISTURE AND ANOTHER COLD FRONT SHOULD PUSH INTO PENNSYLVANIA SUNDAY. THE TIMING WILL LIKELY CHANGE BUT THE FRONTAL PASSAGE IS CURRENTLY INDICATED DURING THE DAY SUNDAY. THIS MAY BE THE BEST CHANCE OF RAIN/SHOWERS SUNDAY PERHAPS INTO SUNDAY EVENING. THE GEFS QPF PDF IMPLIES DURING THE DAY SUNDAY IS BEST CHANCE OF RAIN IN WEST AND INTO EVENING IN THE EAST. VERY LIGHT RAIN INDICATED IN THE GEFS. THE 500 HPA TROUGH BEHIND THE FRONT DEEPENS OVER THE REGION MONDAY INTO TUESDAY. THIS CAUSES THE MODELS AND ENSEMBLES TO INDICATED INSTABILITY SHOWERS MONDAY INTO TUESDAY. LOW POPS MAINLY IN THE SLIGHT CHANCE RANGE. NO GOOD FOCUS FOR ANY RAIN AND THE IS FORECAST TO REMAIN BELOW NORMAL THROUGH PERHAPS THURSDAY. SO OVERALL...OTHER THAN THE FRONTAL RAINFALL POTENTIAL SUNDAY...IT SHOULD BE A COOL DRY PERIOD MOST OF NEXT WEEK. THIS COULD CHANGE SHOULD AN UNRESOLVED SHORTWAVE MOVE THROUGH THE TROUGH FORECAST OVER THE EASTERN UNITED STATES.
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&& .AVIATION /08Z WEDNESDAY THROUGH SUNDAY/... HIGH PRESSURE CENTERED OVER THE MIDWEST SHOULD ALLOW FOR CLEARING OVER THE REGION WHICH SHOULD ALLOW FOR AT LEAST A BRIEF PERIOD OF IFR/LIFR VSBYS AT MOST CENTRAL PA AIRFIELDS. LIKELY EXCEPTIONS WILL BE KJST AND KMDT...WHERE CLIMATOLOGY INDICATES RADIATION FOG IS LESS LIKELY. AOO AND IPT HAVE ALREADY DROPPED TO MVFR AND LIFR RESPECTIVELY. EXPECT BFD TO HAVE PERIODS OF IFR UNTIL 13Z. ANY FOG SHOULD BURN OFF BTWN 13Z-14Z. HIGH PRES AND ASSOC DRY AIR MASS OVER THE REGION WILL TRANSLATE TO A NEAR CERTAINTY OF VFR CONDS AND LIGHT WINDS FOR THE REST OF THE DAY. OUTLOOK... THU-FRI...PATCHY AM FOG POSSIBLE...MAINLY NORTH. SAT-SUN...NO SIG WX EXPECTED. && .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...GRUMM NEAR TERM...GRUMM SHORT TERM...GRUMM LONG TERM...GRUMM AVIATION...FITZGERALD/CERU

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