We are still expecting light ice accretions resulting in slick untreated roads for areas west and northwest of the Boston to Providence corridor. Increasing northeast winds resulting in minor wind damage impact for Cape Cod and the Islands, and a period of minor coastal flooding for the afternoon high tide in eastern MA also remain expected.
Wind and Coastal Flood Advisories were unchanged with this update. While the Winter Weather Advisory for light icing was unchanged - it was extended into the pre-dawn hours Tuesday for the eastern slopes of the Berkshires, as cold rain changes back to wet snow and sleet tonight with continued wintry weather impacts for these locations.
Interior Light Icing:
Locations: West/northwest of the Boston to Providence corridor.
Timing: Spotty freezing drizzle and/or very light freezing rain developing around daybreak. Changeover to rain anticipated in most areas later in the morning.
Amounts: Trace amounts to a couple hundredths of ice in the Winter Weather Advisory area - resulting in a light, thin glaze of ice.
Impact: Slick roads impacting this morning's commute.
Confidence: High. Coverage of freezing drizzle and light freezing rain will be spotty/patchy.
Changeover to Wet Snow Tonight:
Locations: Mainly the eastern slopes of the Berkshires, but also into the northern Worcester hills.
Timing: Before midnight tonight into early Tuesday morning.
Amounts: Up to an inch of combined snow/sleet accumulation, with additional trace ice amounts.
Impact: Slick roads, mainly at elevation.
Confidence: High. Any light freezing rain/freezing drizzle to be brief.
Strong Winds:
Locations: Dukes and Nantucket Counties into Block Island, and Cape Cod.
Timing: 6 AM Monday through early Monday evening.
Sustained Wind: NE 25 to 35 mph.
Wind Gusts: NE 35 to 45 mph with a few gusts up to 50 mph possible.
Impact: Minor damage such as downed tree limbs. Perhaps Isolated power outages.
Confidence: High.
Marine Impacts:
Locations: Massachusetts and Rhode Island coastal waters
Timing: Tonight and Monday
Wind Gusts: NE 35 to 45 kt.
Seas: 4 to 9 ft on the inner bays and sounds; 13 to 17 ft offshore.
Confidence: High.
Minor Coastal Flooding:
Locations: Eastern Massachusetts coast
Timing: Monday afternoon high tide (3:10 PM at Boston and 4:17 PM on Nantucket)
Storm Surge: 1.5 to 2.0 feet
Inundation: Less than 1 foot above ground level
Impact: Some vulnerable shoreline roads may become temporarily impassable around high tide. Minor beach erosion is also possible.
Confidence: High. Overall minor impacts likely as storm storm will remain below 2.0 feet.
Updated storm total snow and ice, maximum wind gust and maximum wave height graphics are attached, as well as an overview of active hazards.