Sunrise 5:48 AM   Sunset 7:29 PM Moonrise 2:15 PM   Moonset 3:59 AM

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ANZ153 Casco Bay- 300 Pm Edt Thu Apr 18 2024
Tonight - SE winds around 5 kt, becoming S after midnight. Seas 2 to 3 ft. Scattered sprinkles until early morning.Fri - SE winds around 5 kt, increasing to 5 to 10 kt in the afternoon. Seas around 2 ft. Fri night - S winds around 10 kt with gusts up to 20 kt. Seas 2 to 3 ft. Scattered showers in the evening, then rain likely after midnight. Sat - SW winds around 10 kt. Seas 2 to 3 ft. Scattered showers. Sat night - W winds around 10 kt. Seas 2 to 3 ft. Sun - SW winds 10 to 15 kt. Seas 2 to 3 ft. Sun night - SW winds 10 to 15 kt with gusts up to 20 kt. Seas 2 to 3 ft. Mon - W winds 10 to 15 kt with gusts up to 20 kt. Seas around 2 ft.Mon night - SW winds around 10 kt, becoming se after midnight. Seas around 2 ft. Tue - S winds 5 to 10 kt, increasing to 10 to 15 kt with gusts up to 20 kt in the afternoon. Seas around 2 ft. Tue night - S winds around 15 kt with gusts up to 25 kt. Seas around 2 ft. Scattered showers after midnight.

ANZ100 300 Pm Edt Thu Apr 18 2024
Synopsis for stonington me to merrimack river ma out to 25 nm high pressure gradually builds into the waters through Friday, resulting in a general onshore flow and the potential for low clouds and fog to develop into early Saturday a weak cold front associated with canadian low pressure crosses the waters on Saturday. High pressure will then build over the waters into early next week before low pressure approaches the region toward mid-week.

FXUS61 KGYX 181929 AFDGYX

Area Forecast Discussion National Weather Service Gray ME 329 PM EDT Thu Apr 18 2024

SYNOPSIS
A weak disturbance brings light rain across New Hampshire into far western Maine through this evening. Temperatures will trend cooler as an onshore component to surface flow builds, culminating in the passage of a frontal system with light rain late Friday into Saturday morning. Quiet, mild, and dry weather returns late Saturday through early next week. Low pressure approaches the region toward mid-week, potentially bringing the next chance for widespread rain.

NEAR TERM /TONIGHT/
High pressure sinks south into the Bay of Fundy tonight as upstream low pressure passes NEward through Toledo, continuing onshore flow for New England. This is a battle of the airmasses... with a very dry airmass associated with the high gradually yielding to a humid column pushing in from the southwest by the approaching low, resulting in light showers or sprinkles before forcing is lost late this evening. Meanwhile at the surface, easterly to southeasterly flow off the waters reinforces increasing humidity especially when mixing is lost later today.

In terms of sensible weather, there will be a noticeable uptick in humidity and clouds which will allow for more uniform overnight temperatures across the region. Have lows generally in the mid-30s as a result. Showers/sprinkles meanwhile will diminish over New Hampshire. Low stratus may form over the interior into the foothills, though this appears to be more of an outlier solution at this tie.

SHORT TERM /FRIDAY THROUGH FRIDAY NIGHT/
Southerly flow increases Friday as low pressure tracks across the Ottawa Valley, dragging a cold front toward New England. As a result more of the forecast area will be under a marine influence, with temperatures topping out in the 50s area-wide...mid-50s for most...
and limited to the 40s along the coast. The daytime is forecast to be dry with a mix of sun and clouds. Will have to keep an eye on any stratus formation over the interior early in the day, but as mentioned above that seems like an outlier at this point.

Clouds increase from the west by the evening as scattered light rain showers enter from the west. I'm not expecting everybody to necessarily pick up light rain with this, however as the front approaches the coast late Fri night / early Sat morning steadier rains are forecast to develop with a subtle amplification of the surface low. But, total amounts still look to be around a tenth of an inch or less. The continued marine influence, along with clouds and humidity from the frontal system, bring our mildest overnight yet with lows in the 40s... probably right around SST along the coast.

LONG TERM /SATURDAY THROUGH THURSDAY/
Overview: The 500 mb pattern shows a broad trough over the region through the weekend into early next week, however dry air looks to dominate overhead at the same time so not much in the way of precipitation is expected. A more amplified trough looks to coincide with a cold front midweek, which could be our next chance of widespread rain.

Some light rain showers may linger into Saturday morning as a cold front will be in the process of crossing the area. While showers come to an end early, a 500 mb trough lagging behind the front will provide enough forcing to keep the remainder of the day cloudy and unsettled, especially if the front gets hung up as well. Otherwise, breezy westerly winds will begin to dry things out in the lower levels and help temperatures warm into the upper 50s to low 60s south of the mountains, and upper 40s to low 50s to the north. Skies will become clear overnight, and with dewpoints dropping as well, low temperatures stand to drop into the 30s across the area.

Sunday will be a very similar day temperature wise, as we start cold and clear, then continued broad troughing overhead and southwesterly upper level flow will allow for some diurnal cloud cover that will cap highs in the upper 50s and 40s from south to north respectively. Upper flow then shifts westerly and dries out the column Sunday night making for another good looking radiational cooling night that will drop temperatures back into the 30s. We will begin a warming trend on Monday as upper flow becomes more zonal and skies stay mostly clear. A cold front may dip across the international border briefly, but with such a dry air mass aloft it wouldn't amount to more than a few extra clouds across the north. Highs will be back in the upper 50s and low 60s across the south, but more 40s up north. Clear skies will continue the trend of lows in the 30s south of the mountains and upper 20s for northern zones that won't be getting as warm during the day.

Surface low pressure looks to ride the aforementioned frontal boundary into the region toward midweek. This would mean increasing clouds on Tuesday, but with southwesterly flow aloft the warming trend would continue and result in many areas south of the mountains seeing 60s and even upper 50s to the north.
Seabreezes will continue to keep coastal areas in the 50s as well. A deeper upper trough and cold front looks to cross Wedensday bringing our next chance for widespread rain. Euro and GFS ensembles have only 0.25 to 0.5" at the moment so nothing drenching, but will continue to keep an eye on trends as this is occuring at the tail end of the extended forecast period and uncertainty in the pattern setup is at its usual high.

AVIATION /19Z THURSDAY THROUGH TUESDAY/
Short Term...VFR decks fill in across the region tonight with MVFR CIGs developing mainly in southern and central New Hampshire by morning. There is a chance that IFR/LIFR CIGs briefly build closer to the coast based on E to SE flow off the Gulf of Maine, however model guidance continues to shy away from that potential in the near-term. More widespread CIG restrictions, mainly MVFR, are expected on Fri into Fri night with increasing S flow and -RA... and a chance of IFR/LIFR in low CIGs /VSBY through the interior. VFR is more likely to prevail at KHIE.

Long Term...MVFR ceilings will be the story for much of Saturday until drier air enters the region overnight into Sunday. VFR prevails from Sunday through Tuesday, before ceilings begin to lower again Tuesday night. Prevailing winds will be westerly through Monday, then shifting southerly on Tuesday.

MARINE
Short Term...Easterly gradient flow AOB 15 kts today deflects southeasterly on Friday then southerly Friday night...
increasing to around 20 kts with rain showers and some fog possible.

Long Term...Westerly winds prevail with daily seabreezes possible through Monday, before shifting to southerly on Tuesday. Wind gusts and seas are expected to stay below criteria hazardous to small craft through this time.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None.

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Richmond
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Thu -- 03:58 AM EDT     Moonset
Thu -- 04:58 AM EDT     1.12 feet Low Tide
Thu -- 05:49 AM EDT     Sunrise
Thu -- 11:00 AM EDT     4.97 feet High Tide
Thu -- 02:15 PM EDT     Moonrise
Thu -- 05:37 PM EDT     0.71 feet Low Tide
Thu -- 07:27 PM EDT     Sunset
Thu -- 11:40 PM EDT     4.76 feet High Tide
Tide / Current data from XTide NOT FOR NAVIGATION

Richmond, Kennebec River, Maine, Tide feet

Upper Hell Gate (Sasanoa River
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Thu -- 12:17 AM EDT     -0.00 knots Slack
Thu -- 02:01 AM EDT     -0.43 knots Max Ebb
Thu -- 03:58 AM EDT     Moonset
Thu -- 05:49 AM EDT     0.00 knots Slack
Thu -- 05:50 AM EDT     Sunrise
Thu -- 10:14 AM EDT     0.70 knots Max Flood
Thu -- 12:25 PM EDT     -0.00 knots Slack
Thu -- 02:15 PM EDT     Moonrise
Thu -- 02:27 PM EDT     -0.60 knots Max Ebb
Thu -- 06:27 PM EDT     0.00 knots Slack
Thu -- 07:27 PM EDT     Sunset
Thu -- 10:47 PM EDT     0.82 knots Max Flood
Tide / Current data from XTide NOT FOR NAVIGATION

Upper Hell Gate (Sasanoa River, Maine) Current, knots

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