DAYS 1-5 (JUNE 3-7)<\/p>\n\n\n\n
This is going to be a “big diurnal” day. We haven’t had many of those this spring with an active pattern of wind and cloud cover preventing such set-ups, but today’s is ideal. Overnight, high pressure moved in and some initial clouds dissipated and moved out, leaving us with clear, calm conditions. Temperatures responded by falling quickly – a process known as radiational cooling – an idea set-up where any warmth from the day radiates easily to space as the air is not mixed by the wind. But today’s atmospheric set-up, with high pressure moving in aloft and the surface high center shifting to the south is one that allows a strong warm up. Often in this set-up, your coolest morning spots become your warmest afternoon spots, so areas like Taunton MA, for example, that sit in the lower 40s as of sunrise for low temps, will probably peak around or just over 80 for a high temp – a nearly 40-degree “diurnal” or difference between morning low and afternoon high. A location where the diurnal will be much less will be Boston’s Logan airport, sitting in the upper 50s early this morning without the full benefit of radiational cooling, eventually to have their temperature rise thwarted by a weak sea breeze, so they go from the upper 50s to perhaps near 70, a “diurnal” or only around a dozen degrees. These specific examples suffice to explain our late spring set-up today with the exception of the rest of the details of the sky conditions. A few patchy mid level clouds may appear in the sky later, and a few fair-weather cumulus may pop up during the day, but the sunshine minutes will be much higher than previous recent days. One limitation will be the trend toward more filtering of the sun by an increasing wildfire smoke plume aloft (from Canada). This will be with us into tomorrow as well, as we have a slightly more pronounced west to southwest wind and a warmer day, even for eastern coastal locations. It’ll be the South Coast most affected by the ocean air in Wednesday’s set-up. Thursday continues the warm up, even qualifying for a “hot” day for areas away from the South Coast as we make a run at 90 – a few places reaching it – and a little more humidity with dew points reaching or breaking 60. A cold front will be approaching from the northwest later Thursday, but its approach will not be aggressive and it also will have limited moisture to work with, and the lack of triggering mechanisms for convection, so I suspect as of today’s update that Thursday’s shower and thunderstorm chance will be minimal, with isolated activity favoring areas well west and north of Boston later in the day. The tricky part of this week’s forecast continues to be the Friday\/Saturday time frame when the aforementioned frontal boundary will sag into our region and hang around for a while, and we watch for 1 or 2 waves of low pressure to drift up our way from the southwest. Yes, once again this means our wet weather chances increase as we head to week’s end, but what I need to still work out as timing of greatest shower and thunderstorm chances. At “days 4 & 5” there really is no way to know the finer details of convective development and the smaller scale triggers that don’t exist until these showers and storms exist, which play a significant role in governing their behavior, so I’m at a loss of ability to go into much detail just yet other than saying that Friday and Saturday look humid and unsettled.<\/p>\n\n\n\n
TODAY: Sunshine, patchy clouds, and variable high altitude smoke, tending to increase later in the day. Highs 71-78 except 63-70 South Coast. Wind SW 5-15 MPH.<\/p>\n\n\n\n
TONIGHT: High altitude smoke. Lows 52-59. Wind SW up to 10 MPH.<\/p>\n\n\n\n
WEDNESDAY: Sun filtered through high altitude smoke. Highs 78-85 except 70-77 South Coast. Wind SW 5-15 MPH.<\/p>\n\n\n\n
WEDNESDAY NIGHT: High altitude smoke. Lower elevation fog patches. Lows 57-64. Wind SW up to 10 MPH.<\/p>\n\n\n\n
THURSDAY: Smoke aloft may thin somewhat with filtered sunshine, otherwise a sun\/cloud mix. Isolated late-day showers and thunderstorms, favoring areas north of I-90 and west of I-95. Highs 85-92 except 77-84 most of South Coast and 70-77 Cape Cod. Dew point 60+. Wind SW 5-15 MPH.<\/p>\n\n\n\n
THURSDAY NIGHT: Variably cloudy. Patchy fog. Lows 60-67. Dew point 60+. Wind SW to variable up to 10 MPH.<\/p>\n\n\n\n
FRIDAY: Variably cloudy. Chance of showers and thunderstorms. Highs 78-85 except 70-77 South Coast. Dew point 60+. Wind SW to variable 5-15 MPH.<\/p>\n\n\n\n
FRIDAY NIGHT \/ SATURDAY: Variably cloudy. Chance of showers and thunderstorms. Areas of fog. Lows 62-69. Dew point 60+. Wind variable 5-15 MPH.<\/p>\n\n\n\n
DAYS 6-10 (JUNE 8-12)<\/p>\n\n\n\n
Currently leaning toward a push of drier air and return to fair weather to finish the weekend on June 8, fair weather early next week and unsettled weather with a trough and frontal system approaching by mid week. Temperatures variable, but not extreme.<\/p>\n\n\n\n
DAYS 11-15 (JUNE 13-17)<\/p>\n\n\n\n
At least one round of unsettled weather, favoring later in the period. No major temperature extremes indicated. <\/p>\n","protected":false},"excerpt":{"rendered":"
DAYS 1-5 (JUNE 3-7) This is going to be a “big diurnal” day. We haven’t had many of those this spring with an active pattern of wind and cloud cover preventing such set-ups, but today’s is ideal. Overnight, high pressure moved in and some initial clouds dissipated and moved out, leaving us with clear, calm … Continue reading Tuesday June 3 2025 Forecast (6:52AM)<\/span>