DAYS 1-5 (MAY 14-18)

An upper low will bring us unsettled weather including some beneficial rainfall today into Friday before it shifts eastward and departs in time for a fair and warmer weekend. Will it last into early next week? No (and yes). Stay with me here and I’ll explain it. First the upper low will be helping a surface low passing to our north to redevelop to our south, which then gets caught under its upper level support and does a loop just to our east and south tonight and early Friday. This helps prolong the rainfall, but the heaviest may be confined to a fairly narrow area somewhere northeast of Boston with another heavier band over the higher elevations of southwestern NH and central MA. We’ll have to radar-watch today / tonight to see how this plays out. An east to northeast flow on Friday will make that a cooler day than today as rain tapers to drizzle, with a clearing trend beginning at night as the low pulls away to the east. An area of high pressure building across the Mid Atlantic then sliding off the coast south to southeast of New England will promote drier, warmer weather with a west to southwest air flow over the weekend. After a cool start Saturday, we’ll undergo a notable warm-up. Sunday ends up the warmest of the two days with a higher temperature launching pad in the morning and continued warm advection. You knew this next part was coming, I bet. If not, it’s time to learn about it. Monday’s weather would probably be similar, but a high pressure area in eastern Canada is destined to send a back-door cold front into at least northeastern and eastern portions of the WHW forecast area, and perhaps a strong enough push to move it all the way through the region. This makes Monday a decidedly cooler day, especially in eastern coastal locations, although it does look like it will continue to be fair with plenty of sunshine as the high to the north will supply enough dry air.

TODAY: Mostly cloudy. Scattered to numerous showers. Highs 56-63. Wind S shifting to E 5-15 MPH.

TONIGHT: Cloudy. Widespread showers. Slight chance of thunderstorms. Lows 47-54. Wind E 5-15 MPH.

FRIDAY: Cloudy. Showers gradually diminish and drizzle lingers. Highs 55-62. Wind E shifting to N 5-15 MPH.

FRIDAY NIGHT: Gradual clearing. Lows 45-52. Wind N shifting to W up to 10 MPH.

SATURDAY: Sunny to partly cloudy. Highs 65-72 South Coast, 72-79 elsewhere. Wind W to SW 5-15 MPH.

SATURDAY NIGHT: Partly cloudy. Lows 48-55. Wind SW 5-15 MPH.

SUNDAY: Partly cloudy to mostly sunny. Highs 68-75 South Coast, 75-82 elsewhere. Wind SW 5-15 MPH.

SUNDAY NIGHT: Mostly clear. Lows 50-57. Wind SW 5-15 MPH.

MONDAY: Sunny to partly cloudy. Highs 62-69 coast, 70-77 inland. Wind shifting to NE 5-15 MPH.

DAYS 6-10 (MAY 19-23)

Warmer weather is back May 19 & 20 but watching for a possible disturbance to trigger a late-day thunderstorm chance on May 19 and a cold front to sweep through with a shower or thunderstorm possible on May 20. Fair, slightly cooler weather follows into later next week. May be watching low pressure to the south by the very end of the period for a potential rain threat, but not sure just yet.

DAYS 11-15 (MAY 24-28)

Watching the potential for low pressure passing to our south around the middle of the Memorial Day Weekend (May 24). Whether or not it’s close enough for a wet weather interruption remains to be seen and will be monitored. Fair weather much of this period otherwise with variable temperatures.