Casco Bay Marine Forecast
| Rest Of Tonight...E Winds 25 To 30 Kt With Gusts Up To 45 Kt. Seas 2 To 4 Ft. Rain. |
| Sat...Ne Winds 25 To 30 Kt With Gusts Up To 45 Kt, Diminishing To 15 To 20 Kt With Gusts Up To 30 Kt In The Afternoon. Seas 3 To 5 Ft. Rain, Mainly In The Morning. Vsby 1 To 3 Nm. |
| Sat Night...N Winds 5 To 10 Kt. Seas 3 To 5 Ft. |
| Sun...Nw Winds Around 5 Kt, Becoming S In The Afternoon. Seas 2 To 4 Ft. A Chance Of Rain In The Afternoon. |
| Sun Night...Sw Winds Around 5 Kt, Becoming Ne After Midnight. Seas 2 To 4 Ft. A Chance Of Rain In The Evening, Then Showers Likely After Midnight. |
| Mon...E Winds 5 To 10 Kt, Becoming Se In The Afternoon. Seas 2 To 3 Ft. A Chance Of Showers In The Morning. |
| Mon Night...Sw Winds 5 To 10 Kt. Seas 2 To 3 Ft. |
| Tue...Sw Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas Around 2 Ft. A Chance Of Showers. |
| Tue Night...Se Winds 5 To 10 Kt, Becoming Ne After Midnight. Seas Around 2 Ft. A Chance Of Showers In The Evening. |
| Wed...Ne Winds 5 To 10 Kt, Becoming E In The Afternoon. Seas 2 To 3 Ft. |
| Wed Night...S Winds 5 To 10 Kt, Becoming N After Midnight. Seas 2 To 3 Ft. |
| Area Forecast Discussion National Weather Service Gray ME 252am EDT Sat May 30 2026 .WHAT HAS CHANGED... No significant changes with this forecast update. .KEY MESSAGES... 1. Low strengthens as it tracks southeast across coastal Massachusetts this morning. This system will bring strong northeast winds across SW Maine and southern NH with moderate to heavy rainfall through mid morning. 2. Accumulating snowfall in the mountains along with wind chills in the teens to single digits bring winter conditions through this morning. 3. Frost is possible across the north Saturday night as a cool airmass settles in. 4. Unsettled pattern persists Sunday through Tuesday with a signal for a warming trend the second half of next week. KEY MESSAGE 1 DESCRIPTION... Latest water vapor imagery shows a potent upper low diving southeast across Vermont with a surface low starting to strengthen near the NH/MA. This low will track SE across Cape Cod around 8am this morning and continue to pull away from the area late this morning with winds and rain diminishing this afternoon. Available 00Z guidance continues to show an axis of moderate to heavy rain north of the low track that will pivot near the NH/ME border around sunrise and then sink south through the morning. Overall Quantitative Precipitation Forecast amounts have not changed all that much with 1-2 across much of western Maine and central through SE NH. Higher amounts remain likely in the mountains and areas near the pivot point which looks to be Carrol County through York and Cumberland Counties. A River Flood Warning remains in effect today for the Saco River at Conway as the river is forecast to cross minor flood stage. Otherwise the area should be able to handle the incoming rainfall and the risk for additional flood warnings/advisories is low. Rain will end north to south starting mid morning and will likely be offshore this afternoon with breaks of sun all the way to the coast by this evening. A period of strong NE winds along SW Maine into southern NH remains likely through mid morning. There has been a slight down trend in peak gusts amongst 00Z hi res guidance and a slight shift south in the peak gusts. Have kept the Wind Advisories unchanged as 40 to 45 mph winds can still cause issues with trees being leafed out. The strongest winds will peak just after sunrise and will diminish through the morning while still remain breezy into the afternoon. KEY MESSAGE 2 DESCRIPTION... No significant changes noted in most recent model guidance with respect to snowfall in the higher terrain as well as the potential for brief bursts of snow down to lower elevations south of the White Mountains into the foothills of far western Maine. Wet bulb zero heigheights dropping as low as 500 feet could allow for some flakes to mix in across central NH and interior SW Maine while any accumulations still likely remain confined to 2000 feet or higher and more likely at or above 3000 feet. Snowfall amounts of 2-4 inches at 4000 feet remain possible with up to a foot on the highest peaks of the Presidentials. Strong winds in the mountains this morning will bring wind chills into the single digits in the mountains and near freezing at lower elevations. Wind chills likely remain in the teens across the high peaks of Presendentials so winter conditions likely persist through the day. KEY MESSAGE 3 DESCRIPTION... A cold air mass remains in place tonight with high pressure building in from the west. This will allow temperatures to drop into the low to mid 30s across the mountains and north and the potential for frost. KEY MESSAGE 4 DESCRIPTION... Active pattern continues Sunday as another short wave drops south out of Canada. Sunday will start off mostly dry with a mix of sun and clouds. The approaching short wave will allow clouds to blossom with convective showers and thunderstorms developing by the afternoon. Cold air aloft and freezing levels near 6000 feet may allow for some small hail or graupel with stronger cells. It will be warmer at the surface with highs Sunday ranging from the upper 50s north to upper 60s south. The short wave will be slow to exit Monday with additional short waves upstream. This will bring continued chances for showers through Monday. The pattern remains locked in place into the middle of next week as the incoming short waves close off into an upper that meanders near the East Coast through Wednesday. There is a signal that ridging will possibly make an appearance the second half of next week for a warming trend. Marine Low pressure near the NH/MA border tracks southeast over Cape Cod this morning. A corridor of strong East- Northeast winds will increase early this morning and peak after sunrise and then will diminish into the afternoon. Storm Warnings and Gale Warnings remain in effect. While winds diminish this afternoon seas will remain elevated above 5 feet into tonight. Unsettled pattern persists Sunday into the middle of next week with multiple troughs of low pressure crossing New England while winds and seas generally stay below SCA (Small Craft Advisory) thresholds. NOAA Gray/Portland ME Office - Watches - Warnings - Advisories ME...Wind Advisory from 5am to 11am EDT Saturday for MEZ018-023- 024. High Surf Advisory from 8am to 8pm EDT Saturday for MEZ023- 024. NH...Wind Advisory from 5am to 11am EDT Saturday for NHZ010- 012>014. High Surf Advisory from 8am to 8pm EDT Saturday for NHZ014. Marine Gale Warning from 2am to 2pm EDT Saturday for ANZ150-152-153. Small Craft Advisory from 2am to 11am EDT Saturday for ANZ151. Storm Warning from 2am to 11am EDT Saturday for ANZ154-182- 184. Gale Warning from 2am to 8pm EDT Saturday for ANZ180. |
Portland ME Radar
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