Marine Weather and Tide Forecast for Scar, ME

NEAR TERM /THROUGH TONIGHT/
A clipper type system will cross the forecast area tonight before reforming near the Midcoast region late at night. This will bring a period of snow or snow showers to the region tonight. The main focus for precipitation will be in the northern mountains with a secondary area of light accumulations of snow possibly along the Midcoast region where the surface low reforms. An inch or two of snowfall may fall in those locations during the night.

Temperatures will fall into the teens in the north to the 20s across the south. A westerly breeze will form over southern portions of the forecast area late tonight as low pressure tracks over the Gulf of Maine.

SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/
Most of the leftover snow showers will retreat to the northern mountains on Tuesday as the low continues to track over the Canadian Maritimes. An upslope west to northwesterly gradient will increase over the region. It will still be seasonably mild with temperatures in the mid 20s north to the mid 30s south.

Cold air advection will continue Tuesday night with H8 temperatures falling to -17C in a well mixed layer. It will be cooler with readings mostly in the teens. Wind chill values will begin to lower as well with snow showers continuing in the northern mountains.

LONG TERM /WEDNESDAY THROUGH MONDAY/
Overview: Broad cyclonic flow is expected through mid-week with seasonable temperatures expected. Flow turns zonal with a brief period of east coast ridging Friday into Saturday as a Hudson Bay Polar Vortex begins to dig south with an Arctic intrusion into the Upper Plains. The cold front will reach our area sometime around Sunday but forecast confidence remains low where the thermal gradient will develop and a potential wave of low pressure riding up the eastern Seaboard on the holiday next week.

Impacts: No major impacts expected through this forecast period.
Cold temperatures in single digits are expected Thursday and Friday morning. Watching a potential coastal low at the end of the forecast period, but confidence for any significant snowfall is still below 10% at this time.

Forecast Details: Wednesday the area will be under cyclonic NW flow as the mid-level trough moves out of the Canadian Maritimes.
Mountain snow shower activity in the mountains will dissipate through the day along with the winds, but will still be cold sub- zero wind chills in mountains and teens on the coast/southern NH.
Thursday the next shortwave trough moves across the region bringing another round of snow showers to the mountains, especially Thursday night as the trough axis moves overhead. Not expecting much for accumulation, but a few inches in the mountains could be possible.
Warming trend starts by Friday as flow becomes zonal with westerly downslope winds off the high terrain causing some adiabatic warming and highs breaking freezing outside the mountains and foothills.
Surface ridge to our south moves off the Atlantic Seaboard allowing for southwest return flow with the warmest day in weeks expected as highs could top 40 degrees near the coast and Southern NH. Cold front is expected to push the area on Sunday with some rain/snow showers across the region. Still large spread on Monday next week, but there could be a quickly developing surface low along the thermal gradient that will bring a shot of cold air.

AVIATION /18Z MONDAY THROUGH SATURDAY/
Short Term...Locally MVFR and IFR conditions expected tonight in any snow showers, mainly at HIE and RKD. Leftover snow showers retreat to the northern mountains Tuesday and Tuesday night.
Otherwise, mainly dry conditions outside of the mountains.

Long Term...Overall aviation impacts will be limited Wednesday through Saturday. Some MVFR conditions are possible at KHIE Wednesday into Thursday with upslope NW flow bringing a low cloud deck and some light snow showers. Gusty NW flow for remainder of TAF sites Wednesday and Thursday with diminishing winds becoming westerly on Friday before a brief period of SW on Saturday.

MARINE
Short Term...The gradient increases over the coastal waters from west to east starting tonight into Tuesday. SCAs will be needed for the outer waters.

Long Term...SCA conditions on Wednesday into Wednesday night at least as offshore NW winds remain strong behind a surface cold front. Another weak cold front expected on Thursday with another round of SCA conditions possible with NW winds. Lighter winds on Friday with southwest winds expected on Saturday. No visibility restrictions expected.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...Small Craft Advisory from 6 AM Tuesday to 6 PM EST Wednesday for ANZ150-152.
Small Craft Advisory from 10 PM this evening to 6 PM EST Wednesday for ANZ154.