From the WABI-TV5 & CW Forecast Center:
The ridge of high pressure currently centered east of the Mid-Atlantic Coastline will continue to pull a very warm and muggy airmass into our region tomorrow as the south to southwest wind continues all across New England. Once again the southerly breeze will hold temps along the coastline of Maine in the mid 70s to low 80s, while inland temps climb into the 80s to near 90. The combination of the warm temps and the very humid air will make it feel like it’s in the 90s over interior parts of Maine Wednesday. A disturbance aloft approaching New England later tomorrow will likely kick off some scattered strong thundershowers during the afternoon and evening hours, with the bulk of the storms likely occurring over western parts of the state.
A slowly approaching cold front will interact with the muggy and rather unstable airmass over New England and bring more numerous showers and storms to our region beginning later Wednesday night and continuing right into the holiday Friday as the front will only slowly slide east through our area. Some of the storms Thursday may be strong to severe and produce strong winds, heavy downpours and even hail.
The front will gradually push offshore later in the day or at night on the fourth and the showers will tend to taper off from west to east. Cooler, drier and less humid air will filter into Maine on a northwest breeze once the cold front slips offshore. High pressure approaching New England from the west will likely bring brighter skies to Maine beginning Saturday. The high should bring fair and seasonably mild weather to our region Sunday. The only question mark for the holiday and the early part of the weekend forecast is the possibility of now Tropical Storm Arthur tracking close enough to our region Friday and part of Saturday to bring more showers and some gusty winds to especially eastern parts of the state. At this point in time it appears the bulk of the storm will remain offshore as it moves up to our east, but just a slight track to the west of current thinking would bring some rain and wind to especially eastern parts of our region. We will keep you posted on any projected track changes.
Tonight: Mostly clear and muggy, with patchy fog likely late and in the 60s to near 70.
Wednesday: Partly cloudy, and muggy, with widely scattered afternoon thundershowers likely and high temps in the upper 70s at the coast and 80s to near 90 inland.
Thursday: Muggy, with showers and storms likely and high temps in the mid 70s to low 80s.
Friday: Showers and storms likely, with high temps in the 70s to near 80.
Saturday: Partly sunny and less humid, with high temps in the 70s to near 80.
Sunday: Mostly sunny, with high temps in the mid 70s to low 80s.
WABI-TV5 & CW Meteorologist