Area Forecast Discussion
Issued by NWS State College, PA

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000 FXUS61 KCTP 311409 AFDCTP AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE STATE COLLEGE PA 1009 AM EDT SUN AUG 31 2014 .SYNOPSIS... A WARM AND HUMID SOUTHWEST FLOW WILL KEEP THE CHANCES FOR RAIN IN THE FORECAST THROUGH THE LABOR DAY HOLIDAY. A COLD FRONT WILL BRING A BREAK IN THE HUMIDITY FOR MID WEEK. && .NEAR TERM /THROUGH TONIGHT/...
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WIDESPREAD RAIN SHOWERS IMPACTING NORTHERN AND CENTRAL MOUNTAINS THIS MID/LATE MORNING. CONVECTION AT A MINIMUM...BUT SCT TSTMS WILL DEVELOP OVER NEXT SEVERAL HOURS AS PRECIP SHIFTS GRADUALLY SOUTHEASTWARD AND TRANSITIONS TO A MORE CELLULAR STRUCTURE. THIS AFTERNOON WE COULD ALSO SEE A SEVERE THREAT DEVELOP IN THE SERN ZONES. MODELS ARE COOKING UP A FAIR AMOUNT OF CAPE OVER EASTERN AREAS HINTING THAT THE THE CLOUDS WILL BE LESS EXTENSIVE ALLOWING FOR MORE IN THE WAY OF SOLAR HEATING. FORECAST MID LEVEL LAPSE RATES ARE WEAK BUT SHEAR WILL INCREASE WHICH COULD AID IN ORGANIZING STORM DEVELOPMENT. MODELS ALSO PROG A WEAK LOW LEVEL CONVERGENCE ZONE...PERHAPS THE REMNANTS OF THE OLD WARM FRONT WHERE ENHANCED LOW LEVEL SHEAR...EHI`S PROGGED 1-3(M^2/S^2) COULD HELP A STORM OR TWO TAKE ON SOME SPIN. WITH LOW LCLS EXPECTED IN THE VERY TROPICAL AIRMASS...HAVE TO STAY AWARE OF THE POTENTIAL FOR AN ISOLATED TORNADO. AS IT STANDS RIGHT NOW...THE SEVERE THREAT WILL BE VERY DEPENDENT ON GETTING THE SUN TO COME OUT AND FIRST COOK UP THE CAPES /AT 14Z CLOUDS STILL FAIRLY WIDESPREAD...WITH BREAKS IN FAR SE COUNTIES AND HINTS OF BREAKS BEGINNING TO DEVELOP ACROSS THE SOUTHERN MTNS/. WITH AN ANOMALOUSLY STRONG LOW LEVEL JET AND PURE TROPICAL AIR...ANOTHER THREAT WILL BE LOCALLY HEAVY RAIN IN SOME OF THE THUNDERSTORMS. IT HAS BEEN DRY SO NO HEADLINES ARE PLANNED...BUT WILL OPT FOR SOME ENHANCED WORDING IN THE FORECAST AND HWO PRODUCT. HIGHS WILL ONLY REACH THE MID 70S ACROSS THE NORTH...BUT SUNSHINE AND A VERY MILD START WILL ALLOW THE SE TO RISE INTO THE MID 80S. DEWPOINTS WELL UP IN THE 60S TO LOWER 70S WILL BRING ONE OF THE MORE UNCOMFORTABLY HUMID DAYS WE`VE SEEN THIS SUMMER...AND ENHANCE LOW LEVEL INSTABILITY. IT`S HARD TO PIN DOWN WHAT WILL OCCUR OVERNIGHT WITH REGARD TO CONVECTION. ECMWF/NAM/GFS ALL PAINT DIFFERENT SCENARIOS. THE NAM/SREF REPRESENT THE WETTEST SOLUTIONS WITH SOME SORT OF MESO LOW TRACKING ACROSS SOUTHERN PA. THE GFS/GEFS ARGUE FOR SMALLER CHANCES OF RAIN WITH MOST OF THE AREA SEEING WEAK LOW LEVEL RIDGING DEVELOP IN THE WAKE OF TODAY`S EVENTS. THE ECMWF IS THE DRIEST OF ALL. RIGHT NOW WE HAVE LIKELY POPS OVER THE SOUTH AND CHANCE OVER THE NORTH. UNLESS I SEE SOMETHING COMPELLING...WILL PROBABLY NOT CHANGE IT MUCH GIVEN THE EXPECTATIONS OF LITTLE OR NO REAL FOCUSING MECHANISM. ANOTHER WARM MUGGY NIGHT IS IN STORE AS THE AIRMASS WILL REMAIN VIRTUALLY UNCHANGED.
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&& .SHORT TERM /MONDAY/... AT THIS TIME I AM HOLDING OUT HOPE OF A DRIER LABOR DAY...BUT CANNOT DROP THE MENTION OF RAIN ALTOGETHER. SREF/GEFS BOTH SHOW THE ANOMALOUS PWAT PLUME SLIDING EAST WITH DRYING TAKING PLACE LOCALLY. SHORT RANGE OPERATIONAL GUIDANCE HINTS AT WEAK SHORTWAVE RIDGING AND RISING UPPER HEIGHTS...SO I TRENDED POPS DOWN DURING THE DAY WITH THE THINKING BEING THAT MOST AREAS WILL HAVE A DRY AFTERNOON AND EVENING FOR THE LAST OF THE TRADITIONAL SUMMER`S COOKOUTS. OVERALL IT WILL NOT FEEL SIGNIFICANTLY DRIER HOWEVER AS TEMPERATURES WILL ONCE AGAIN RISE INTO THE 70S AND 80S WITH DEWPOINTS REMAINING TROPICAL IN THE 60S AND LOWER 70S. && .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/... STILL PRETTY GOOD AGREEMENT IN A COLD FRONT SWINGING THROUGH THE STATE LATE TUESDAY. THIS SHOULD PROVIDE THE BEST CHANCE OF RAIN IN THE EXTENDED BEFORE HIGH PRESSURE BUILDS IN FOR MIDWEEK...BRINGING A FEW DAYS OF MILD AND DRY WEATHER. THE NEXT CHANCE FOR RAIN LOOKS LIKE IT WILL NOT BE UNTIL LATER IN THE WEEK WHEN A MORE HUMID FLOW WILL DEVELOP AROUND THE HIGH MOVING OFF THE COAST. AT THIS POINT A COLD FRONT LOOKS LIKELY FOR SATURDAY FOLLOWED BY A COOLER AIRMASS FOR NEXT WEEKEND. THIS UPCOMING WEEK WILL BE ONE OF THE RARE EXTENDED PERIODS OF WARMER THAN NORMAL TEMPERATURES WE HAVE SEEN THIS SUMMER. HIGH TEMPERATURES WILL CLIMB TO ALMOST 90 ACROSS THE SOUTH AND EAST ON TUESDAY AHEAD OF THE FRONTAL PASSAGE. THEN AN UPPER RIDGE WILL BUILD OVER THE EASTERN US FOR THE SECOND HALF OF THE WEEK...KEEPING HIGH TEMPERATURES AT OR SLIGHTLY ABOVE SEASONAL NORMALS FOR EARLY SEPTEMBER. && .AVIATION /14Z SUNDAY THROUGH THURSDAY/...
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LARGE AREA OF RAIN SHOWERS IMPACTING THE NORTH AND CENTRAL MTNS WITH WIDESPREAD IFR TO MVFR CIGS/VSBY. CONDITIONS ARE SOMEWHAT VARIABLE DEPENDING ON INTENSITY OF THE SHOWERS...BUT RESTRICTIONS WILL PERSIST. CIGS/VSBYS WILL GENERALLY IMPROVE LATER IN THE DAY...WITH LOCAL RESTRICTIONS CONTINUING. MVFR CIGS ACROSS THE SE WHERE IT REMAINS RAINFREE AT 14Z. BUT SHOWERS/SCT TSTMS WILL DEVELOP IN THE LOWER SUSQ THIS AFTERNOON...AND A FEW OF THE STORMS COULD BE STRONG WITH GUSTY WINDS AND HEAVY RAINFALL. BUT THESE CONDITIONS SHOULD BE FAIRLY SHORT-LIVED. ANOTHER WAVE WILL KEEP SCT SHOWERS MAINLY SOUTH OF I-80 TONIGHT...WITH LOWER CIGS AGAIN DOMINATING ACROSS NORTHWEST HALD OF CWA. OUTLOOK... MON...AM FOG POSS...ESP W MTNS. ISOLD PM TSRA IMPACTS POSS. TUE...SCT PM TSRA IMPACTS POSS. WED...PATCHY AM FOG POSS. THU...PATCHY AM FOG POSS.
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&& .CTP WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...LA CORTE/RXR NEAR TERM...LA CORTE/RXR SHORT TERM...LA CORTE LONG TERM...LA CORTE AVIATION...MARTIN/RXR

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