AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 612 PM EST Sat Feb 28 2026 .WHAT HAS CHANGED... Looking slightly drier on Sunday with lesser snowfall totals expected. Confidence is increasing that snow will change to a wintry mix and rain late Tuesday. && .KEY MESSAGES... - Turning very cold behind the Arctic front Sunday night into Monday - Areas of light snow and snow showers likely on Sunday with dry air preventing significant accumulations - Trending above normal temperatures Wednesday through Saturday. Becoming unsettled with a prolonged risk for periodic precipitation. && .DISCUSSION... Key Message 1...Turning very cold behind the Arctic front Sunday night into Monday Quick bout of mild weather this afternoon and evening comes to an end as a weak front moves through overnight. A stronger arctic front moves through Sunday, knocking highs back into the 30s. Coldest temps occur overnight Sunday as the core of the cold moves overhead. Winds will decrease Sunday night with the center of arctic high pressure moving in; however, the wind chill index will likely be below zero across interior Southern New England. High temperatures on Monday will be quite cold for March standards, only topping out in the low to mid-20s. Arctic air remains in place Monday night with low temperatures once again bottoming out in the single digits. Little to no wind is expected Monday night, limiting the wind chill factor. Key Message 2...Areas of light snow and snow showers likely on Sunday with dry air preventing significant accumulations Earlier model uncertainty and spread has narrowed somewhat with regards to Sunday`s snowfall forecast. Ensemble QPF totals for the 12 and 18z model cycles have fallen significantly and now range from 0.10-0.20 at the 25th and 75th percentiles respectively. These changes have been largely the result of individual deterministic models resolving a drier air aloft ahead of a strong area of high pressure approaching from the W later Sunday. Upper level forcing also seems to be limited to the cold front itself, with the parent shortwave staying in northern New England. However, 850 mb FGEN will be quite strong given the intense temperature gradient. Given these changes, the snowfall forecast remains nearly unchanged, with a widespread trace to 1 inch expected across much of Southern New England, with some spots seeing perhaps 2-3 inches at the worst. The most likely spots to see the higher totals will be the high terrain across the northern Berkshires and Worcester hills. Snow will move from west to east on Sunday, starting in the mid to late morning and moving offshore around sunset. Given the lack of stronger forcing, hourly snow rates will be light, under a half inch per hour. Key Message 3...Trending above normal temperatures Wednesday through Saturday. Becoming unsettled with a prolonged risk for periodic precipitation. Below normal temperatures expected Monday as the core of an arctic airmass lingers over our region. After then, temperatures should be near normal for Tuesday, before trending above normal for Wednesday into Saturday. By late next week, most of southern New England could actually remain above freezing all day and night. This will have implications for precipitation type. It appears that our region will be in the vicinity of some frontal boundaries that shift back and forth across our region. This will lead to a prolonged period for precipitation chances, but it will not be actually precipitating this entire time. Within this larger period, we`re more focused on two smaller periods with a greater risk. The first of these looks to be sometime Tuesday into Wednesday, which is when a weak low pressure should move past our region. The timing is not as certain with a high pressure expected over the North Atlantic. This pattern tends to slow the arrival of precipitation, or could even shift the focus over northern New England instead. At present, this looks like a light-snow-to-rain scenario given the recent arctic air. The later the precipitation holds off, the more likely rain would be the primary type. Snow would be most likely to linger across the higher terrain of the Berkshires and the northern Worcester Hills. The second period we`re more focused on looks to be sometime Thursday into Friday. Our region gets caught between a pair of fronts. By that time though, it currently appears that we would remain warm enough for a light rainfall across southern New England. && .AVIATION /00Z SUNDAY THROUGH THURSDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Tonight...Moderate Confidence. VFR with areas of MVFR and some IFR possible across S RI and SE MA with fog development. Light winds shift more NW-ly. Sunday...Moderate Confidence. Generally MVFR cigs as the chance for some light snow showers increases late Sunday morning into the early afternoon. Light snow moves from W to E between 15 and 18z then gradually comes to an end between 19 and 23z from W-E. Not expecting much accumulation with this system. Possibly up to 1-1.5 inches, with confidence on the moderate level as model guidance slowly comes into agreement with each run. Northerly winds at 10-15 knots. KBOS Terminal...High confidence in TAF. VFR. SW-ly winds 5-10 knots today veer NW-ly late tonight. Expecting -SN arrival 15-16z and departing 20-22z. Light accumulation near or just above 1 inch possible. KBDL Terminal...Moderate confidence in TAF. VFR. S-ly winds 5-10 knots veer NW-ly tonight. Expecting -SN arrival around 15z and departing 20-21z. Light accumulation up to 1.5 inches possible. Outlook /Sunday Night through Thursday/... Monday through Monday Night: VFR. Tuesday: Mainly VFR, with local IFR possible. Breezy. RA likely, chance SN. Tuesday Night: MVFR/IFR conditions possible. Breezy. RA. Wednesday: VFR. Slight chance RA. Wednesday Night: Mainly VFR, with local MVFR possible. Chance RA. Thursday: Mainly VFR, with areas IFR possible. Chance RA. && .MARINE... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. Through Sunday Night...High confidence. S to SE winds shift more N tonight into Sunday morning. Winds begin to increase to near 25 knots Sunday night into Monday morning, with seas building to 5 feet across the outer waters. Chance of light to moderate freezing spray across the inner waters Monday night into late Monday afternoon. Outlook /Sunday Night through Thursday/... Monday: Winds less than 25 kt. Areas of seas approaching 5 ft. Monday Night: Winds less than 25 kt. Tuesday: Low risk for Small Craft Advisory winds with gusts up to 25 kt. Seas locally approaching 5 ft. Chance of rain, chance of snow. Tuesday Night: Moderate risk for Small Craft Advisory winds with gusts up to 30 kt. Areas of rough seas. Rain. Wednesday: Winds less than 25 kt. Local rough seas. Chance of rain. Wednesday Night through Thursday: Winds less than 25 kt. Areas of seas approaching 5 ft. Chance of rain. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...Freezing Spray Advisory from 1 AM to 10 AM EST Monday for ANZ231>235-237-251. Small Craft Advisory from 9 PM Sunday to 1 PM EST Monday for ANZ250-254>256. && $$