Penobscot Bay Marine Forecast
|Tonight...W Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. A Slight Chance Of Showers After Midnight.|
|Sat...Nw Winds 5 To 10 Kt With Gusts Up To 20 Kt, Becoming Ne In The Afternoon. Seas 1 To 2 Ft. A Chance Of Showers In The Morning.|
|Sat Night...E Winds 5 To 10 Kt, Becoming 5 To 15 Kt With Gusts Up To 20 Kt After Midnight. Seas 1 Foot Or Less.|
|Sun...E Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 1 To 2 Ft.|
|Sun Night...E Winds 5 To 10 Kt. Seas 1 Foot Or Less, Then 1 To 2 Ft After Midnight. A Chance Of Showers After Midnight.|
|Mon...E Winds 5 To 10 Kt. Seas 1 To 2 Ft In The Morning, Then 1 Foot Or Less. A Chance Of Showers.|
|Mon Night...Sw Winds 5 To 10 Kt. Seas 1 Foot Or Less, Then 1 To 2 Ft After Midnight. A Chance Of Showers.|
|Tue...Nw Winds 5 To 10 Kt. Seas 1 To 2 Ft.|
|Tue Night...Nw Winds 5 To 10 Kt. Seas 1 Foot Or Less.|
|Wed...W Winds 5 To 10 Kt. Seas 1 Foot Or Less.|
|Wed Night...Sw Winds 5 To 10 Kt. Seas 1 To 2 Ft.|
|Area Forecast Discussion|
National Weather Service Gray ME
1046pm EDT Fri May 25 2018
Synopsis: A cold front will slowly drop south through the region tonight through Saturday and will stall south of New England Saturday night. High pressure will build in from the northeast on Sunday and will hold over the region Sunday night. High pressure will shift east on Monday as a weak warm front approaches from the west. A cold front will drop south through the region Monday night. High pressure will build over the region Tuesday and will push offshore south of New England Wednesday.
Near Term - Until 6am Saturday Morning
Update 2...Temperatures still quite warm for almost 11 PM. Used observations to tweak temperatures up. Also adjusted POPS and weather mostly in the the Jackman to Pittston Farm area where several rounds of showers and thunderstorms have been moving through.
Update...Will issue a quick update. Have adjusted temperatures and dew points to observations and have trimmed back probability of precipitation except for the northeast portion of the forecast area. No other changes.
Previous Discussion...Back door cold front currently situated across far northern Maine will slowly work its way southwest into northern zones overnight. This boundary will be the focus for occasional showers (maybe a rumble of thunder far north) first pushing into northeast zones this evening and then into central and eastern zones after midnight. Expect Quantitative Precipitation Forecast to be on the light side...generally less than a quarter inch. The remainder of the area will see increasing clouds overnight. Lows will range from the mid 50s north to the mid 60s south
Short Term - 6am Saturday Morning Through Saturday Night
Cold front will continue to push south on Saturday gradually shifting into southern New England by evening. Although clouds may limit heating ahead of the front in southern New Hampshire and southwest Maine...expect enough instability to develop during the morning hours to Probability of Precipitation off scattered convection in the afternoon. With freezing levels on the high side and marginal shear not looking for severe storms but healthy PWAT's approaching 1.5 inches will contribute to heavy downpours. High temperatures will range through 70s across western Maine and northern New Hampshire. Southern New Hampshire will range through the 80s.
Showers and Thunderstorms will gradually push south of the region Saturday evening and high pressure will build in from the northeast after midnight. Increasing onshore flow will bring ocean stratus into southern New Hampshire and southwest Maine overnight and areas of fog will be likely as well. Low temperatures will range through the 40s in northeast zones and lower to mid 50s in the cloudier southwest
Long Term - Sunday Through Friday
Forecast area will be situated north of a backdoor cold front Sunday and Monday. While we are not expecting widespread rain to wash things out, it does look cloud and much cooler than normal both days. There could also be fog, especially at the coast. Chances for showers increase across southern zones - they'll be closer to the frontal forcing. Overall, not the best way to end the holiday weekend, but it could be worse. The low level maritime air mass should be displaced by a cold front Monday night allowing for much better weather for Tuesday - including highs back into the 70s to 80s again. Fair weather continues Wednesday and Thursday with high pressure in control. Low pressure, possibly what's leftover from Alberto in the Gulf of Mexico could visit our region and bring some rain late in the week.
Short Term: Continuing Small Craft Advisories through 800 pm. Small Craft Advisories may be needed again late Saturday night.
Long Term: Small Craft Advisory possible Sunday and Sunday night for the ocean waters and possibly briefly in the bays
Back door cold front will bring showers into the region overnight with showers and some thunderstorms continuing on Saturday. Moist onshore flow will set up behind the front for Saturday night and Sunday. No fire weather issues are anticipated through the period
NOAA Gray/Portland ME Office - Watches - Warnings - Advisories
ME...None. NH...None. MARINE...None