DAYS 1-5 (JUNE 26-30)
For the final 5 days of June, this is quite the complex forecast. So right to it. We start out with a trough over southeastern Massachusetts this morning, triggering a few showers. This shifts offshore as a second weak trough ambles its way eastward across the region during the day today. This will provide enough focus for at least clouds to pop, and probably a few isolated to possibly scattered showers and thunderstorms. It will once again be a case where most people don’t get anything, but those who happen to be under one of them can experience a heavy downpour. This moves off tonight, and more changes are on tap for the weekend. First a warm front will cross there region Saturday with varying amounts of cloudiness, although contrary to some model data bringing showers, in some cases steadier rain, into the region as early as the morning, I feel that we’ll hold off any wet weather threat until afternoon and that it will be more patchy in nature. However, if there is enough sunshine, I cannot rule out a couple heavier thunderstorms popping up near and just south of the frontal boundary. The real dilemma with this is that the front may never really cleanly get through the region, and may hang up around the MA/NH border, which could make for an interesting temperature contrast in the region by late in the day. We may have a case where an easterly wind is blowing near the NH Seacoast where it is quite cool, while areas west and south of Boston are much warmer and more humid. We may have to iron-out these details in “now-cast” form during Saturday. That front will push back to the south during Sunday, but will be in no hurry to do so, so there will be the continued opportunity for showers and thunderstorms to pop up. Again, don’t expect a widespread soaking rain event with this. It will struggle to provide much in the way of beneficial rain, with downpours running off, and a longer-lasting gentle rainfall not in the cards. When we get to Monday and Tuesday, we’ll find ourselves in a cooler but weak north to northeast air flow behind the front and a departing low pressure wave, but upper level low pressure over the region with cold air aloft keeps the atmosphere unstable so we can see diurnal showers and thunderstorms develop each day. Again, not a widespread rain fall, just pop up activity. And while it’s a little early to call for this, with cold air aloft like that sometimes these types of pop up showers/storms can produce hail as well. So that will be something to also watch for as we get into early next week. I must stress, however, that the overall pattern remains dry and with the exception of the South Coast, for now, we are in the early stages of a drought.
TODAY: Partly cloudy. Isolated showers near Cape Cod early to mid morning. Isolated showers / thunderstorms anywhere but favoring southeastern NH, eastern MA, and RI this afternoon. Highs 78-83 South Coast, 83-88 elsewhere. Wind W-SW 5-15 MPH.
TONIGHT: Partly cloudy. Lows 60-67. Wind W 5-15 MPH.
SATURDAY: Early sun, then variably cloudy. Risk of showers and possibly a thunderstorm mid afternoon on. Highs 83-90 except 76-83 Cape Cod. Temperatures may cool back during the afternoon especially southern NH and northeastern MA. Wind SW 5-15 MPH may shift to E in southern NH and northeastern MA during the afternoon.
SATURDAY NIGHT: Mostly cloudy. Scattered showers and isolated thunderstorms. More humid. Lows 63-70. Wind variable up to 10 MPH.
SUNDAY: Variably cloudy. Scattered showers and thunderstorms. Highs 78-85. Wind variable 5-15 MPH.
SUNDAY NIGHT: Partly cloudy. Lows 58-65. Wind W-NW 5-15 MPH.
MONDAY: Partly sunny. Isolated afternoon showers and thunderstorms. Highs 77-84, coolest coast. Wind N-NE 5-15 MPH.
MONDAY NIGHT: Partly cloudy. Risk of a shower early. Lows 56-63. Wind NE under 10 MPH.
TUESDAY: Partly sunny. Isolated afternoon showers and thunderstorms. Highs 76-83, coolest coast. Wind NE 5-15 MPH.
DAYS 6-10 (JULY 1-5)
Look out! Here comes July! A tiny bit more confidence today that the pattern for the early days of the month will be similar to what we have seen recently, and stubbornly, and that is high pressure that likes to be centered north of New England with weaker low pressure to the south. This is a dry pattern overall, limited shower activity, and no intense heat or humidity.
DAYS 11-15 (JULY 6-10)
I cautiously lean toward a shift, finally, to a more zonal pattern, west to northwest flow in the upper levels, temperatures near to above normal, and continued limited opportunities for any showers and thunderstorms. Expect drought conditions to expand through the first third of July.