THE NEXT SYSTEM WE WILL BE WATCHING CLOSELY IS THE DEVELOPING WARM OCCLUSION THAT EXTENDS SOUTHWARD FROM A 990 MB LOW CENTERED NEAR 44N 141W. THE NEW 00Z GFS SHOWS WARM ADVECTION MOISTURE SPREADING INTO THE SOUTHWEST INTERIOR SATURDAY EVENING...THEN NORTHWARD TO INCLUDE THE SEATTLE-TACOMA-EVERETT METRO AREAS LATE SATURDAY NIGHT INTO SUNDAY MORNING. THE GFS AND THE 00Z WRFGFS FROM THE UNIVERSITY OF WASHINGTON SHOWS 2-5 INCAND HES OF SNOW ALONG THE CENTRAL COAST AND IN THE SOUTHWEST INTERIOR...1-3 INCHES FOR THE SEATTLE METRO AREA. THIS LINES UP SOMEWHAT WITH WHAT THE 12Z CANADIAN MODEL WAS SHOWING EARLIER TODAY. THE 00Z CANADIAN IS DRIER WITH THIS SYSTEM AND HOLDS HEAVIER PRECIPITATION BACK WITH THE WARMER SYSTEM SUNDAY NIGHT. MODELS ARE JUMPING AROUND...AND THE 12Z ECMWF DID NOT EVEN SHOW THIS SATURDAY NIGHT-SUNDAY MORNING SYSTEM AFFECTING OUR AREA. THE 00Z NAM12 KEEPS PRECIPITATION FAR SOUTH - BUT THAT MODEL PERFORMED QUITE POORLY OVER NW OREGON AND FAR SW WA TODAY. TO TOP OFF UNCERTAINTY TONIGHT...THE 00Z CANADIAN KEEPS EASTERLY PRES GRADIENTS RATHER STRONG THRU SUN AND SUN EVENING AND SHOWS SUB FREEZING BOUNDARY LAYER TEMPERATURES DESPITE THE WARMING ALOFT SUNDAY EVENING...FREEZING RAIN IN THE SEATTLE METRO? WILL AWAIT THE INCOMING 00Z ECMWF BEFORE MAKING ANY DECISIONS...BUT UNCERTAINTY IS HIGH DESPITE THE TIMEFRAME BECOMING RATHER SHORT. ALBRECHT Interesting. do not buy those quite yet
