Area Forecast Discussion
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000 FXUS61 KPBZ 271944 AFDPBZ AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE PITTSBURGH PA 244 PM EST THU NOV 27 2014 .SYNOPSIS... COLD NORTHWEST FLOW WILL KEEP SCATTERED SNOW SHOWERS ACROSS THE REGION TONIGHT. HIGH PRESSURE WILL BRING DRY AND CHILLY CONDITIONS FRIDAY. && .NEAR TERM /THROUGH FRIDAY/... SHORTWAVE TROUGH PRODUCING SNOW SHOWERS LATE THIS AFTERNOON WILL EXIT EAST TOWARD SUNSET WITH A NORTHWEST FETCH FROM THE LAKES PRODUCING SNOW SHOWERS OVERNIGHT. INVERSION HEIGHTS WILL ALLOW FOR SOME ACCUMULATING SNOW ALONG THE I-80 CORRIDOR AND IN THE RIDGES...WITH 1-2 ACROSS THE NORTH AND 1-3 HIGHEST SOUTHEAST RIDGE ELEVATIONS. SURFACE RIDGE WILL BRING SUBSIDENCE LATE TONIGHT INTO FRIDAY WITH SNOW SHOWERS ENDING EARLY MORNING. STILL COLD FRIDAY AS SURFACE HIGH SHIFTS EAST. && .SHORT TERM /FRIDAY NIGHT THROUGH SUNDAY/... SOUTHWEST LOW LEVEL FLOW WILL DEVELOP FRIDAY NIGHT INTO SATURDAY WITH UPPER LEVEL FLOW BECOMING MORE ZONAL. A SHORTWAVE AND WARM ADVECTION WILL BRING CLOUDS AND POSSIBLY A BIT OF LIGHT SNOW EARLY SATURDAY NORTH OF PITTSBURGH. TEMPERATURES WILL WARM DRAMATICALLY SATURDAY NIGHT AND SUNDAY AHEAD OF AN APPROACHING UPPER TROUGH AND COLD FRONT. LOW LEVEL MOISTURE WILL INCREASE AHEAD OF THE FRONT ALLOWING FOR SCATTERED RAIN SHOWERS SATURDAY NIGHT AND SUNDAY. TEMPERATURES WILL WARM TO OVER +5 AT 850MB SUNDAY AFTERNOON WITH MAX TEMPS WELL INTO THE 50S SUNDAY. && .LONG TERM /SUNDAY NIGHT THROUGH THURSDAY/... FRONT WILL CLEAR THE AREA EARLY MONDAY MORNING. SHOWERS WILL END BUT TEMPS WILL COOL DOWN ON MONDAY. SEASONABLE TEMPERATURES MID WEEK WITH THE NEXT DISTURBANCE AND COLD FRONT ARRIVING LATE TUESDAY AND WEDNESDAY. && .AVIATION /20Z THURSDAY THROUGH TUESDAY/... MVFR CONDITIONS ARE EXPECTED THROUGH THE AFTERNOON AS AN AREA OF SNOW SHOWERS DRIFTS SOUTHWARD IN ADVANCE OF A SECONDARY COLD FRONT. OCCASIONAL IFR VSBYS ARE ANTICIPATED AS THIS AREA OF SNOW MOVES ACROSS THE TAF SITE...THUS TEMPO GROUPS WERE ADDED FOR THE NEXT SEVERAL HOURS WITH TIMING USED FROM RADAR. STRENGTHENING COLD ADVECTION AND NORTHWEST FLOW WILL SUPPORT LAKE ENHANCED AND UPSLOPE SNOWS THROUGH TONIGHT BUT CURRENT THINKING IS THAT RESTRICTIONS ASSOCIATED WITH SNOW SHOWERS WILL GENERALLY REMAIN CONFINED TO THE NORTHERN SITES. AN IMPROVEMENT TO VFR IS EXPECTED ON FRIDAY OUTLOOK.../FRIDAY THROUGH MONDAY/... VFR RETURNING BY FRIDAY AS RIDGE BUILDS EASTWARD. THE NEXT CHANCE FOR RESTRICTIONS WILL BE SUNDAY WITH THE PASSAGE OF A COLD FRONT. && .PBZ WATCHES/WARNINGS/ADVISORIES... MD...NONE. OH...NONE. PA...NONE. WV...NONE. && $$

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