I’m dipping back off the grid for a few days so this update will contain forecast information through Sunday.
The sun has finally returned to western parts of the area this morning after a rather overcast stretch. That stretch will continue along the coast today thanks to light onshore flow, abundant low-level moisture, and weak winds. There shouldn’t be too much in the way of shower activity today as the marine layer is quite stable and the cold front we would need for interior thunderstorms is still well to our west. High temps today will rise into the low 80s for much of the region with cooler temps in the 70s along the coast.
The cold front currently to our northwest will arrive tomorrow which means southerly breezes pushing marine fog onshore in the morning and the chance for thunderstorms in the afternoon. High temps will climb well into the 80s across central/southern NH and the foothills/coastal plain of Maine. The front will arrive sooner in the mountains where highs will be a bit cooler in the upper 70s. Afternoon showers and storms will pop up along the mountains and progress southeast into the evening. A few storms might have enough juice to produce gusty winds in addition to heavy rain and lightning, but no widespread severe weather is expected.
Showers and storms will linger over southern NH Saturday morning as the front loses steam just to our south. A wave of low pressure passing along this boundary will keep skies mostly cloudy across all but far northern parts of the area with folks south of Portland/Plymouth NH seeing periods of rain as well. Some of this rain may be quite heavy depending on where exactly the front stalls out. Given recent heavy rain and saturated soils, there is some potential for flooding in southern NH if the current signal for heavy rain remains strong. Thick clouds will hold temps in the low 70s across the south on Saturday with mid 70s likely north of Augusta.
A similar pattern is likely to be in place Sunday as that front doesn’t really have anywhere to go. A surge of cooler, drier air from the northeast is possible which would cut down on the odds of rain for all except the MA/NH border region. However, mid/upper-level clouds would likely stick around. This should lead to another cooler day especially in the south while northern spots make another run towards 80.
I’ll be back with another update on Monday morning.