Area Forecast Discussion
Issued by NWS Raleigh/Durham, NC

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045 FXUS62 KRAH 051747 AFDRAH AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE RALEIGH NC 1245 PM EST FRI FEB 5 2016 .SYNOPSIS...
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IN THE WAKE OF A LOW PRESSURE SYSTEM DEPARTING THE MID- ATLANTIC COAST...COOL HIGH PRESSURE WILL BUILD IN FROM THE WEST THROUGH THE WEEKEND. A SURFACE LOW WILL PASS BY THE CAROLINA COAST ON SUNDAY...FOLLOWED BY AN ARCTIC COLD FRONT THAT WILL ARRIVE EARLY NEXT WEEK.
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&& .NEAR TERM /TODAY THROUGH TONIGHT/... AS OF 1015 AM FRIDAY... THE EARLY MORNING RAIN/SNOW MIX HAS FIZZLED AS DRIER AIR WORKS IN FROM THE WEST IN THE WAKE OF THE DEPARTING LOW...WHICH IS NOW SOUTH OF LONG ISLAND. LINGERING MOISTURE AROUND 4000K FT IN THE COASTAL PLAIN AND SOME VERY SHALLOW INSTABILITY...PER RAP SOUNDINGS...COULD STILL RESULT IN A FEW RAIN DROPS EAST OF THE I-95 CORRIDOR THROUGH NOON. HOWEVER...WITH THE MOISTURE STEADILY ERODING AND STRENGTHENING SUBSIDENCE INVERSION ALOFT...HAVE REMOVED REMAIN POPS. COLD ADVECTION AT 850MB IS PROGGED TO CONTINUE THROUGH THIS AFTERNOON AND DRY ADIABATIC MIXING TO BETWEEN 925MB AND 850NMB SUPPORTS HIGHS IN THE MID 40S...A DEGREE OR TWO BELOW STATISTICAL GUIDANCE. -SMITH WINDS DIMINISH LATE THIS AFTERNOON THROUGH TONIGHT UNDER CLEAR SKIES... AS THE SURFACE HIGH BUILDING IN FROM THE WEST SHIFTS OVERHEAD. LOWS 23-29... COLDEST IN THE RURAL PIEDMONT AND WRN SANDHILLS. -GIH && .SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/... AS OF 245 AM FRIDAY... THE WEEKEND WILL START OUT QUIET... ALTHOUGH CLOUD COVER WILL BE ON THE RISE... WITH PATCHY LIGHT PRECIP POSSIBLE LATE SAT NIGHT IN THE FAR SE. INITIALLY DRY AND STABLE AIR OVER CENTRAL NC WILL LEAD TO CONSIDERABLE SUNSHINE TO START SAT. THE SURFACE RIDGE EXTENDING SW TO NE ACROSS NC EARLY SAT WILL NARROW FURTHER AND BE OVERTAKEN BY LOW PRESSURE FORMING OVER THE BAHAMAS ALONG THE OFFSHORE FRONTAL ZONE... IN RESPONSE TO HEIGHT FALLS WITH THE APPROACH OF A POTENT SHORTWAVE TROUGH NOW DIVING DOWN THROUGH ERN CO/NM. AS THIS AMPLIFYING WAVE CROSSES THE GULF STATES/NRN GULF AND SOUTHEAST SAT/SAT NIGHT... THE SURFACE LOW IS EXPECTED TO DEEPEN QUICKLY AND TRACK TO THE NE... STAYING FAR ENOUGH OFFSHORE TO BE OF LITTLE CONSEQUENCE FOR CENTRAL NC. HOWEVER... A FEW MODELS SUGGEST THAT THERE WILL BE ENOUGH ATLANTIC MOISTURE WRAPPING AROUND THE LOW TO SPREAD LIGHT PRECIP INTO OUR FAR SE CWA OVERNIGHT. THE LOW LEVELS ARE EXPECTED TO REMAIN SOMEWHAT DRY BELOW 5 000 FT... WHICH WOULD MAKE ANY PRECIP VERY LIGHT WITH ONLY TRACE AMOUNTS. PARTIAL THICKNESSES SUPPORT THIS PRECIP BEING MOSTLY LIGHT SNOW... AND THIS IS ALSO WHAT IS INDICATED BY THE TOP-DOWN METHODOLOGY... AS FORECAST SOUNDINGS SHOW GOOD SATURATION UP TO AND ABOVE -20C WITH A COLD COLUMN. WILL BRING IN SMALL POPS IN OUR SOUTHEAST SAT NIGHT BUT WITH MINIMAL QPF AND NO NOTABLE IMPACT EXPECTED AT THIS TIME. HIGHS SAT IN THE MID 40S TO LOWER 50S WITH SOME RECOVERY IN THICKNESSES. LOWS FROM THE UPPER 20S NW TO LOWER 30S SE. -GIH && .LONG TERM /SUNDAY THROUGH THURSDAY/... AS OF 245 AM FRIDAY... SUNDAYS PROMINENT WEATHER FEATURE WILL BE A DEEPENING LOW PRESSURE SYSTEM WITH AN UPPER LOW OVER THE CAROLINAS AND THE SURFACE LOW OFF THE CAROLINA COAST. WHILE MUCH OF THE SYSTEM WILL REMAIN OFF OF THE COAST...THERE IS SOME POTENTIAL FOR PRECIPITATION TO CREEP INTO THE EASTERN THIRD OF OUR CWA ON THE NORTHWEST SIDE OF THE STORM. AT THIS TIME MOST OF THE PRECIPITATION IS EXPECTED TO BE RAIN WITH POTENTIALLY SOME WET SNOW MIXED IN PER NOMOGRAM THICKNESSES. DRY LOW LEVELS MAY KEEP SOME OF THE PRECIPITATION FROM REACHING THE GROUND FOR A WHILE. ANY PRECIPITATION THAT DOES OCCUR SHOULD EXIT TO THE EAST BY SUNDAY EVENING AT THE LATEST. NO IMPACTS ARE EXPECTED WITH THIS STORM AT THIS TIME. WE WILL CONTINUE TO MONITOR FOR ANY SHIFT IN THE GUIDANCE. HIGHS ON SUNDAY WILL BE AROUND 50 DEGREES WITH AN UNUSUAL TEMPERATURE DISTRIBUTION OF WARMEST TEMPERATURES IN THE WEST AND COLDEST IN THE SOUTHEAST DUE TO GREATER CLOUD COVER AND COLD AIR ADVECTION AROUND THE NORTHWEST SIDE OF THE STORM. LOWS MONDAY MORNING NEAR FREEZING IN MOST LOCATIONS. MONDAY WILL BEGIN WITH A LULL BETWEEN THE EXITING COASTAL SYSTEM AND THE NEXT LARGE UNORGANIZED SYSTEM OVER THE GREAT LAKES WHICH WILL USHER IN ARCTIC AIR FROM CANADA. TIMING OF THE WEAK FRONT THAT WILL SIGNAL THE ARRIVAL OF THIS COLDER AIRMASS WILL BE LATER IN THE DAY SO TEMPERATURES IN THE SOUTH WILL STILL MAKE IT TO THE LOW 50S WITH MID 40S IN THE TRIAD. AS THIS IS A CONTINENTAL AIRMASS...THERE IS NOT MUCH MOISTURE WITH THE SYSTEM AT ALL AND PW VALUES REMAIN BELOW A HALF OF AN INCH. THAT BEING SAID...THERE WILL STILL BE SOME PRECIPITATION WITH THIS SYSTEM...BEGINNING MOST LIKELY AFTER 15Z ON MONDAY AS RAIN. ANYTHING THAT FALLS SHOULD REMAIN RAIN UNTIL LATER IN THE EVENING WHEN A RAIN/SNOW MIX WILL EVENTUALLY TURN TO ALL SNOW AFTER 3Z TUESDAY AS NOMOGRAM THICKNESSES TANK. BY THIS TIME HOWEVER...MOST OF THE MOISTURE WILL BE THROUGH THE AREA AND ANY SNOW SHOWERS ARE NOT EXPECTED TO ACCUMULATE AT THIS TIME. LOWS MONDAY NIGHT IN THE UPPER 20S NW TO LOW 30S SE. SOME INTERMITTENT LIGHT SNOW SHOWERS WILL STILL BE POSSIBLE ON TUESDAY BUT OF LITTLE CONSEQUENCE AS QPF VALUES REMAIN VERY LOW. EVENTUALLY THE VERY DRY AIR WILL TAKE OVER AND THE COLD TEMPERATURES WILL BECOME THE MAIN STORY AS HIGHS TUESDAY ONLY MAKE THE LOW TO MID 40S AND LOWS TUESDAY NIGHT DIVE INTO THE MID 20S. WEDNESDAY WILL BE THE COLDEST DAY...WITH HIGHS IN THE MID 30S TO NEAR 40 DEGREES AND WIND CHILLS IN THE 20S FOR MOST OF THE DAY. LOWS IN THE LOWER TO MID 20S BY THURSDAY MORNING WITH WIND CHILLS IN THE TEENS. DESPITE THE COLD...DRY CONDITIONS WILL PREVAIL. ON THURSDAY THE UPPER TROUGH BEGINS TO FINALLY LIFT OUT AND TEMPS WILL REBOUND INTO THE MID 40S. && .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/...
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AS OF 1245 PM FRIDAY... NORTH-NORTHWESTERLY WINDS WILL CONTINUE TO GUST INTO THE 20-25KT RANGE THIS AFTERNOON...WITH VFR CONDITIONS OTHERWISE PREVAILING. THE PRESSURE GRADIENT WILL WEAKEN QUICKLY TONIGHT AS HIGH PRESSURE BUILDS IN FROM THE WEST...ALLOWING WINDS TO BECOME NEARLY CALM. VFR WILL CONTINUE. LOOKING BEYOND 18Z SATURDAY...VFR CONDITIONS WILL PREVAIL ON SATURDAY. A SURFACE LOW PASSING BY THE CAROLINA COAST ON SUNDAY MAY BRING LIGHT PRECIP AND A PERIOD SUB-VFR CONDITIONS FROM KFAY TO KRWI. AN UPPER LEVEL DISTURBANCE WILL BRING ANOTHER CHANCE OF SUB- VFR CONDITIONS AND PATCHY PRECIP TO ALL SITES MON AFTERNOON INTO TUE.
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&& .RAH WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SYNOPSIS...HARTFIELD NEAR TERM...HARTFIELD/SMITH SHORT TERM...HARTFIELD LONG TERM...ELLIS AVIATION...SMITH

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