Marine Weather and Tide Forecast for Wiscasset, ME

KEY MESSAGES
1. Periods of light snow wind down through the evening hours.
Upslope mountain snow showers continue through the overnight hours tonight.

2. Seasonable temperatures prevail through the end of the week and into the weekend, with above average temps possible next week.

3. A potential system late this weekend and early next week continues to waffle back and forth on recent model runs, but remains an item of focus. Currently limited threat for an impactful system.

DISCUSSION

KEY MESSAGE 1 Discussion...

Periods of light snow continue across parts of central Maine and the MidCoast into the evening hours tonight as an inverted trough remains positioned across Downeast Maine. The trough then pivots southwestward as it spins out to sea, bringing the best chance for a steadier burst of light snow to the MidCoast region this evening. Accumulations wouldn't amount to much more than a coating, but do add a fresh layer onto the roads after dark tonight.

Upslope snow showers continue across the higher terrain and north into the overnight hours. These gradually decrease in coverage late tonight as moisture levels drop off, but clouds likely linger through at least the daytime tomorrow.

KEY MESSAGE 2 Discussion...

High pressure builds in from the west through the remainder of the week and into the weekend. Seasonable temps and mainly dry conditions arrive on northwesterly flow as a modified Pacific airmass arrives after traversing through Canada.

Highs generally range from the mid to upper 20s across the north, to mid to upper 30s across the south. Nighttime lows remain seasonably cool as most nights feature favorable radiational cooling conditions. These conditions are expected for Thursday night through at least Saturday night. Lows in the single digits and teens are expected, and below zero readings possible across the northern valleys.

A weak shortwave swings through Friday night, and may bring a brief period of clouds and scattered snow showers with it.

KEY MESSAGE 3 Discussion...

Attention remains on a potential system for Sunday and Monday.
Models and ensemble members have trended back a bit further north with this system since yesterday. However, we continue to avoid jumping back and forth with each model suite and monitor the pattern as one that's favorable for East Coast cyclogenesis.

The main source of uncertainty pertains to how quickly a shortwave in the northern jet stream branch merges with a moisture-rich wave in the southern branch. Models will likely continue to wobble back and forth with the timing of this convergence, with a clearer picture unlikely to emerge until at least late Thursday.

AVIATION /18Z WEDNESDAY THROUGH MONDAY/
Periods of MVFR linger across northern and eastern terminals into the evening. IFR improves to MVFR at HIE this evening, with MVFR likely lingering into at least Friday.

Thursday Night-Sunday AM: VFR prevails.

Sunday - Monday: Restrictions with snow are possible. Should the storm miss to the south, VFR would prevail.

Tuesday: VFR most likely.

MARINE
Low pressure deepens across Atlantic Canada through tomorrow as high pressure builds in from the west. SCA conditions develop in northwesterly flow tonight, and likely linger into early Friday.
High pressure then builds across the waters into the weekend, with conditions mostly below SCA levels late Friday and into the weekend.
Low pressure likely then tracks south of the Gulf of Maine on Sunday and Monday.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...Small Craft Advisory until 7 AM EST Friday for ANZ150-152-154.
Small Craft Advisory from 1 AM Thursday to 7 AM EST Friday for ANZ151.