1030 AM UPDATE... HERE WE GO. TOP-DOWN MOISTENING APPARENT BETWEEN 0Z AND 12Z CHATHAM SOUNDING WITH SOME DRY-AIR LINGERING AROUND H85. MUCH DRIER N PER PORTLAND MAINE SOUNDING WITH EXTREMELY LOW PWATS. IT IS THE COMBINATION OF THERMAL-PACKING / AIRMASS ALONG WHICH WITHIN THE MID-LEVELS THAT WE ARE BEGINNING TO SEE W-E F-GEN FORCING ALONG THE DEVELOPING WARM-FRONT AS ACTIVITY ALOFT NEGATIVELY TROUGHS LENDING TO INTENSIFICATION OF SURFACE LOW PRESSURE ALONG THE ENHANCED BAROCLINIC ZONE OFFSHORE OF THE MID-ATLANTIC. CHECK OUT THE H85-5 VERTICAL WIND PROFILES OUT OF THE S. H925 WINDS OUT OF THE E... PERHAPS AIDING IN MOISTENING OF LOW-LEVELS AND ADDING A DEGREE OF OCEAN-EFFECT FETCH TO THE DISCERNED BANDING. WITHIN THE E-W SNOW BANDING PRESENTLY IMPACTING THE S-COASTAL COMMUNITIES OF NEW ENGLAND...VISIBILITIES WILL DROP TO A MILE ON AVERAGE. SNOW SHOULD ACCUMULATE IMMEDIATELY AS TEMPERATURES RANGE AROUND THE UPPER- TEENS TO LOW-20S AND THE GROUND IS EXCEPTIONALLY COLD. ALSO SEEING A COASTAL FRONT SETUP SW-NE OFFSHORE OF THE IMMEDIATE E-MA COASTLINE AND THROUGH THE CAPE-COD CANAL. THE CONVERGENCE OF WINDS AND DECENT MOISTURE FETCH IS LENDING TO SOME LIGHT SNOWS OVER THE S-BOSTON-METRO INTO PLYMOUTH COUNTY. EXPECTING ACTIVITY TO CONTINUE THROUGH THE DAY AS THE ISALLOBARIC WIND COMPONENT INCREASES IN RESPONSE TO THE ANTICIPATED DEEPENING OF LOW PRESSURE OFFSHORE OF THE MID-ATLANTIC. IMPORTANT: AS ALLUDED TO BY THE PREVIOUS FORECASTER...WITH INCREASING WINDS YIELDS AN INCREASING FETCH. ENHANCEMENT OF OCEAN-EFFECT SNOWS ACROSS E-MA POSSIBLE TOWARDS THE EVENING COMMUTE. INCREASING SNOWFALL RATES AND SUBSEQUENT REDUCED VISIBILITIES WITH ACCUMULATING SNOWFALL...COULD BE IMPACTS TO EVENING BOSTON-METRO AREA COMMUTE. WILL NEED TO MONITOR THAT CLOSELY.