Lexington, Massachusetts, USA
000 FXUS61 KBOX 170506 AFDBOX Area Forecast Discussion National Weather Service Boston/Norton MA 106 AM EDT Wed Apr 17 2024 .SYNOPSIS... High pressure over southern New England will bring dry weather through mid week. It will be cooler Wednesday along the coast with sea breezes. Isolated to scattered showers across the interior Thursday with slightly below normal temperatures. Dry on Friday with high pressure in control. A cold front brings another round of light rain showers late Friday through Saturday. Turning drier Sunday and Monday. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... 930 PM Update... * Quiet overnight...light wind & lows in the 30s to lower 40s Previous forecast is on track. A ridge of high pressure overhead will continue to result in mainly clear skies, light/calm winds and a good night of radiational cooling. Overnight low temps should bottom out well down into the 30s across the normally coolest outlying locations...to between 40 and 45 in some of the urban centers. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM THURSDAY/... The mid level ridge axis shifts directly overhead on Wednesday leading to sunny skies for a good portion of the day and dry weather all day. The skies will fill in with high clouds from west to east starting mid morning, thickening and lowering through the day ahead of a warm front. Temperatures during the day will be quite different along the coast compared to inland locations thanks to a seabreeze. By afternoon we expect temps in the low to mid 50s along the coast and low to mid 60s inland. The better plume of moisture arrives after sunset ahead of a shortwave pushing into the eastern Great Lakes. There continue to be considerable discrepancies amongst the guidance as to how far east into SNE the PWAT plume pushes, but ensembles are in agreement that the far better chance of wet weather will be over western MA/CT where the much more moisture is present and upslope flow into the terrain will enhance lift. The GEFS and EPS put the chance of measurable rain over 90% in western MA/CT and less than 30% in far eastern MA. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... Highlights * Isolated to scattered showers on Thu, mainly across the interior, with slightly below normal temperatures. * Dry for much of Fri with temps returning to seasonable levels. * Cold front brings scattered showers late Fri through Sat. Mild temperatures return. * The temperature roller coaster continues, with a return to near normal temperatures and dry weather for Sun into Tue. Southern New England will be dealing with another mid level omega block. This time through, we should initially be located beneath the ridge portion of this block. Currently expecting this mid level ridging to move off to our east towards this weekend, leading to a transition to a broad mid level trough early next week. At the surface, high pressure should remain in control of our weather into Friday morning. Thus, mainly dry weather expected, although there could be a risk for scattered showers towards its edges, which would be mainly across the western half of southern New England both Thursday and Friday. A slow moving front Saturday should continue the risk for showers, before high pressure arrives late this weekend into early next week. Stayed close to the NationalBlend solution for this portion of the forecast. Can see a scenario where rainfall chances could be lowered in later forecasts for Thursday and Friday. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... Forecast Confidence Levels: Low - less than 30 percent. Moderate - 30 to 60 percent. High- greater than 60 percent. 06z TAF Update... Today...High Confidence. VFR despite the increase in some mid/high clouds especially across interior southern New England this afternoon. Light NNE winds becoming light S this afternoon...except for localized seas breezes developing along the coast. Tonight and Thursday...High Confidence. Some MVFR ceilings and showers develop tonight across western MA/CT with the best chance near and west of the CT River. These conditions will persist at times into Thursday. Meanwhile...across eastern MA/RI mainly VFR conditions are expected. Light SE winds tonight becoming E between 5 and 10 knots on Thursday. KBOS TAF...High confidence in TAF. Classic E/ESE sea breeze develops at the terminal by mid to late morning. KBDL TAF...High confidence in TAF. Outlook /Thursday Night through Sunday/... Thursday Night: Mainly VFR, with local MVFR possible. Isolated SHRA. Friday: Mainly VFR, with local MVFR possible. Breezy. Slight chance SHRA. Friday Night through Saturday: Mainly VFR, with local MVFR possible. Breezy. Chance SHRA. Saturday Night: VFR. Breezy. Slight chance SHRA. Sunday: Breezy. && .MARINE... Forecaster Confidence Levels: Low - less than 30 percent. Medium - 30 to 60 percent. High - greater than 60 percent. Today through Wednesday Night...High Confidence. Weak pressure gradient will keep winds and seas below Small Craft Advisory thresholds through Wednesday night. No fog or vsby issues expected. Outlook /Thursday Night through Sunday/... Thursday through Thursday Night: Winds less than 25 kt. Seas locally approaching 5 ft. Isolated rain showers. Friday: Winds less than 25 kt. Friday Night through Saturday: Winds less than 25 kt. Seas locally approaching 5 ft. Chance of rain showers. Saturday Night: Winds less than 25 kt. Areas of seas approaching 5 ft. Slight chance of rain showers. Sunday: Winds less than 25 kt. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...None. MA...None. RI...None. MARINE...None. && $$ SYNOPSIS...Belk/BW NEAR TERM...Frank SHORT TERM...BW LONG TERM...Belk AVIATION...Frank/Belk MARINE...Belk/BW
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