Area Forecast Discussion
Issued by NWS

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 KPBZ 191416 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 916 AM EST FRI DEC 19 2014 .SYNOPSIS... BUILDING HIGH PRESSURE IS EXPECTED THROUGH THE WEEKEND...THOUGH CLOUDS WILL REMAIN. && .NEAR TERM /THROUGH TONIGHT/... FINE LINE ON RADAR IS THE BACK EDGE OF FREEZING DRIZZLE AND FLURRIES WITH SURFACE TROUGH AND BACK EDGE OF STRETCHED VORT BEHIND SHORTWAVE EXITING EAST. ALLOWED ADVISORIES TO EXPIRE AS RADAR TRENDS AND SURFACE OBS SHOW DIMINISHING TREND TO PRECIP AND HAVE ISSUED SPS TO COVER REMAINING PATCHY PRECIP. FORECAST SOUNDINGS SHOW CLOUDS MAY HOLD IN THROUGH TONIGHT SO HAVE ADJUSTED SKY GRIDS UP. NO CHANGE TO PREVIOUS TEMPERATURE. && .SHORT TERM /SATURDAY THROUGH SUNDAY NIGHT/... HIGH PRESSURE WILL REIGN OVER THE FORECAST AREA THROUGH THE WEEKEND. A WEAK OPEN WAVE TRIES TO SKIRT THE SRN EXTENT OF THE SFC HIGH SAT AFTERNOON...BUT MODELS CONTINUE TO TREND IT FURTHER SOUTH WELL OUT OF OUR REGION. AFTER LARGELY ZONAL FLOW ALOFT THROUGH SUNDAY THE UPPER LEVEL PATTERN FAVORS SWRLY FLOW ON THE BACKSIDE OF THE SFC HIGH. THIS WILL WORK TO DRIVE WARMER TEMPS INTO THE FORECAST AREA WITH HIGHS DRIVING ABOVE AVERAGE HEADING INTO EARLY NEXT WEEK. TAX && .LONG TERM /MONDAY THROUGH THURSDAY/... WHILE THE MODELS AGREE ON A DEEPENING UPPER LEVEL TROUGH TO CLOSE OFF OVER THE GREAT LAKES THROUGH THE PERIOD THE DETAILS OF HOW THIS EXACTLY UNFOLDS WILL BE CRITICAL. BY MONDAY SOUTHERN STREAM SHORTWAVE AHEAD OF MAIN NORTHERN STREAM UPPER TROUGH DIGGING INTO THE NORTHERN PLAINS WILL PRODUCE LOW PRESSURE ACROSS THE CAROLINAS MOVING OFF SHORE OF THE EAST COAST. THE SOUTHEAST RIDGES MAY BE BRUSHED BY LIGHT RAIN FROM THIS SYSTEM. NEXT UP IS DEEPENING LOW PRESSURE OVER THE OHIO VALLEY AHEAD OF SHARPLY DIGGING UPPER TROUGH AND CLOSED LOW MOVING INTO THE WESTERN GREAT LAKES. UPPER OHIO VALLEY LOOKS TO BE ON THE WARM SIDE OF THE SYSTEM TUESDAY INTO WEDNESDAY WITH RAIN...FOLLOWED BY STRONG COLD FRONT AND COLD ADVECTION LATER WEDNESDAY NIGHT AND THURSDAY WITH SNOW SHOWERS. WITH SUCH A STRONG SYSTEM ALOFT AND FAST DEEPENING LOW PRESSURE AT THE SURFACE TIMING OF COLD AIR AND EXACT TRACK WILL LIKELY CHANGE AS WE GET CLOSER TO CHRISTMAS. ALL IN ALL PREVIOUS FORECAST IS LITTLE CHANGED WITH ONLY MINOR ADJUSTMENTS BASED ON NEWEST WPC EXTENDED PROGS. && .AVIATION /14Z FRIDAY THROUGH TUESDAY/... MVFR TO ISOLATED IFR CIGS WILL IMPROVE TO MVFR THIS AFTERNOON AND CONTINUE TONIGHT. OUTLOOK.../FRIDAY NIGHT THROUGH TUESDAY/... STRATUS AND RESTRICTIONS MAY PERSIST INTO THE WEEKEND. NEXT STORM SYSTEM WILL BRING RESTRICTIONS TUESDAY. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && $$

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