NEAR TERM /THROUGH THURSDAY/
635 am update...
Update to add patchy fog along the shoreline for the next couple of hours. Have removed river valley fog for early this morning, leaving mostly sunny in over all areas today. Some altocu remains acrs the north with lingering moisture around 750mb still present. Thin cirrus working north with system over the mid-Atlantic. Minor updates to the going forecast.

Prev discussion blo...
Surface high remains over the waters and extends into New England early this morning and will gradually shift east today.
However, area will still be under the influence of ridge axis with mostly sunny skies over the entire area. Temps this afternoon will be similar to yda/s highs climbing into the middle 80s.

Clouds will be on the increase tonight ahead of upr low drifting thru the mid-Atlantic. Some areas may see fog develop late tonight, especially down near the coast. Given little change in airmass have kept mins similar to this morning with lows in the l/m 50s.

SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/
High pressure will remain over the area Thursday bringing another very warm and moderately humid day. Low pressure off Southern New England will be nearby to the south. This low is expected to remain to our south but may come close to the coast. Clouds north of this low will bring a mostly cloudy day along the coast. Meanwhile, further north, a cold front will push into Northern Maine early Thursday afternoon then continue south from there. The front is being pushed south by a new high pressure system and ridging across far Northeastern Canada. There may be a slight chance for a shower as the front pushes through the area Thursday afternoon. Otherwise, it is expected to be a mainly dry frontal passage.

The cold front will push offshore and merge with the low off the coast Thursday night. This may contribute to some intensification of the offshore low bringing breezy conditions with a northeasterly wind along the coast Thursday night into Friday. The low is still expected to remain offshore but may be close and may impact parts of Eastern New England south of our area.

LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/
Friday night will be cooler than recent nights as high pressure builds down from the north. Northern areas will be mostly clear while Downeast is partly cloudy, to perhaps mostly cloudy near the coast with a northeasterly breeze along the coast as the offshore storm remains near to the south.

High pressure will continue to build down from Eastern Canada Saturday into Saturday night supported by the subsidence between strong ridging pushing into Quebec and upper level low pressure over the Northern Maritimes. This will push the offshore storm away to the southeast bringing a clear to partly cloudy sky over the region.
The cooler air pushing in from the northeast will bring a cool day on Saturday with highs from the mid 60s north to the upper 60s Downeast. This will be followed by a mostly clear and very cool night Saturday with lows in the 40s across the area.

Canadian high pressure will continue to press down from the north Sunday into Sunday night. The high will be cresting nearby to the northeast Sunday night. Lighter winds and calmer air near the surface will result in a very cool night with lows near 40 in some of the cooler northern valleys. A few spots may dip into the upper 30s with a chance for patchy frost over northwestern spots.

Dry and cool weather will persist into early next week as high pressure and upper ridging remain over the region. Another low may begin to approach mid to late week but is looks like blocking may also hold that one to the south, at least through mid-week.

AVIATION /12Z WEDNESDAY THROUGH SUNDAY/
NEAR TERM: VFR for Aroostook terminals next 24 hours. Downeast terminals likely to see VFR conditions today before diminishing late tonight. BHB should drop to IFR vsbys and cigs after 09z with BGR dropping to MVFR in BCFG.

SHORT TERM: Thursday...VFR. Light and variable winds south, Light N wind north.

Thursday night...VFR. Light NE wind.

Friday into Friday night...VFR. Light NE wind north and a moderate northeast wind over the south.

Saturday through Sunday...VFR. Light NE wind.

MARINE
NEAR TERM: Seas and winds will remain below small craft levels today and tonight. SW winds gusting to around 15ks this afternoon with seas ranging from 1 to 3 feet.

SHORT TERM: Northeast winds may approach SCA at times Friday into early Saturday as low pressure off the coast intensifies for a period. Otherwise, wind and seas should be below SCA into the coming weekend. Some fog and mist may still be over the waters on Thursday due to humid air.
Drier air pushing down from Canada should bring good visibility Friday through the weekend.

CLIMATE
Near record high temperatures are possible today. Although some of the records look to be well out of reach there are a few records that could potentially be tied or broken such as Houlton. Here are the record highs today.

9/18: Caribou: 86F, 1942 (forecast high 85F)
Bangor: 87F, 1992 (forecast high 85F)
Millinocket: 87F, 1991 (forecast high 84F)
Houlton: 82F, 2015 (forecast high 84F)

Houlton's high temperature of 86 yesterday September 17th set a new record. The old record of 85 was set in 1942 and 2018.

CAR WATCHES/WARNINGS/ADVISORIES
ME...None.
MARINE...None.