Area Forecast Discussion National Weather Service Boston/Norton MA 226 PM EDT Fri Sep 12 2025 SYNOPSIS Cool and calm conditions overnight with radiation fog likely in low- lying areas. Warm and partly cloudy Saturday with isolated showers possible in the afternoon. Not as cool Saturday night, but radiation fog is possible again. Rain chances return Sunday with highs in the lower to mid 70s. We then return to dry weather and temperatures near or just warmer than average through mid week. .NEAR TERM /THROUGH TONIGHT/... High pressure remains anchored overhead tonight, leading to another calm and quiet night. With clearing skies this evening and light winds overnight, expect strong radiational cooling tonight with lows dipping into the mid-40s to mid-50s. Dewpoints will be rising slightly overnight as winds near the coast turn more southerly. With the cold temps, radiation fog will likely form in low-lying areas overnight and could become locally dense. .SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/... Tomorrow High pressure moves off to the east tomorrow morning, with a weak shortwave and warm front moving through the region in the afternoon. There is enough mid-level moisture and forcing present to support weak isolated afternoon showers, but capping aloft will likely limit these showers from growing into heavy showers or thunderstorms. Afternoon highs will be a bit warmer than Friday, jumping into the mid to upper 70s. Light southerly flow will allow dewpoints to rise into the upper 50s to low 60s. Tomorrow night Not quite as cool overnight, as lows will be bound by the higher dewpoints, with lows in the mid-to-upper 50s. Another round of radiation fog is possible as skies clear after sunset and winds become light and variable. .LONG TERM /SUNDAY THROUGH FRIDAY/... Key Messages... * Chance for showers and thunderstorms Sunday then drying out for next week. * Seasonable temperatures continue early, warming a bit by mid week. Latest guidance trends continued more toward the drier end of the forecast spectrum. While there is still a risk for some showers, am thinking coverage remains more isolated and will not amount to very much where it does rain. Another large high pressure still looks like it will settle over southern New England by Monday, and linger through most of next week. Thus, anticipating continued dry weather with near normal temperatures for mid September. It's not until late next week where there is a low chance for another moisture-starved cold front to try an generate some showers across our region. Went more with the persistent dry pattern and kept the mention of showers out of the forecast at this time. .AVIATION /18Z FRIDAY THROUGH WEDNESDAY/... Forecaster Confidence Levels... Low - less than 30 percent. Moderate - 30 to 60 percent. High - greater than 60 percent. 12Z TAF Update: Today and tonight: High confidence. VFR through the period. NE winds 5-10 kt inland, NE to E 10-15 kts for the eastern coastal airports. May see some FEW-SCT cloud decks 4-6kft for the interior in the afternoon. Winds tonight become light and variable. Patchy fog possible for the interior terminals after 09z, mainly in the valleys. Saturday: High confidence. VFR. S winds 5-10 kts. KBOS Terminal...High confidence in TAF. KBDL Terminal...High confidence in TAF. Outlook /Sunday through Wednesday/... Sunday: VFR. Slight chance SHRA. Sunday Night through Wednesday: VFR. .MARINE... Forecaster Confidence Levels... Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Light ENE winds turning S through Saturday. Seas remain 2-3 feet. Outlook /Sunday through Wednesday/... Sunday through Sunday Night: Winds less than 25 kt. Slight chance of rain showers. Monday through Wednesday: Winds less than 25 kt. .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. SYNOPSIS...Belk/KP NEAR TERM...KP SHORT TERM...KP LONG TERM...Belk AVIATION...Belk/KP MARINE...Belk/KP
Forecast And Data Provided By NOAA-NWS Boston / Norton, MA