Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KGYX 130656 AFDGYX Area Forecast Discussion National Weather Service Gray ME 256 AM EDT Sun Aug 13 2017 .SYNOPSIS...
-- Changed Discussion --
Low pressure will drag a trailing cold front through New England this morning with drier air working in during the day. Quiet and mild weather is expected for Monday with a cold front expected to approach Tuesday with showers and thunderstorms possible during the afternoon. High pressure builds in Wednesday before another low pressure system possibly affects the region Thursday into Friday.
-- End Changed Discussion --
&& .NEAR TERM /TODAY/...
-- Changed Discussion --
Remnant showers are making their way east along the Midcoast this morning. This should be the last of the rain for most of us. Drier air is moving in behind a cold front, so expect a noticeably less humid day today, with temperatures topping out in the mid 70s north to mid 80s in southeast New Hampshire and the coastal plain of Maine where downsloping winds will aid in low level mixing. As the upper trough axis rotates through today, there could be a few showers developing primarily in northern areas. With cooling/drying in the low levels, instability will be a bit hard to come by. But in the north will be where the least stable environment will be along with the best lift associated with the trough. Anything that develops there should remain just showers, as there is not enough instability for thunderstorms today.
-- End Changed Discussion --
&& .SHORT TERM /TONIGHT AND MONDAY/...
-- Changed Discussion --
Surface high pressure moves in from the west tonight. That should set up a pretty good radiational cooling night with a clear sky allowing us to lose all of our daytime warmth. Dry air in place will allow temperatures to fall into the 40s for the colder valleys, while much of the area will fall into the 50s. It should be a good night for valley fog, so expect all the major valleys to have fog in place by morning. High pressure moves east on Monday, with a return southerly flow setting up. This will bring some gradual warming of temperatures aloft which will generally spell a warm day. But mixing won`t be as strong on the coastal plain as it was today, so temperatures there will be a few degrees cooler.
-- End Changed Discussion --
&& .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
-- Changed Discussion --
A short wave trough and attendant cold front will approach from the west on Tuesday. Forcing for ascent combined with heating and increased moisture will allow for the development of showers and thunderstorms during the afternoon, mainly across the interior. More stable air on the coastal plain may keep things dry. The cold front will sweep offshore Tuesday night which will set us up for a nice day on Wednesday. 00z deterministic models are in good agreement with a rather juicy short wave trough approaching the region for the Thursday/Friday timeframe. With plenty of moisture to work with there seems to be a good chance of a period of showers and thunderstorms along with some heavy rain. However, since convection is involved here, confidence on rainfall amounts is rather low at this time.
-- End Changed Discussion --
&& .AVIATION /07Z SUNDAY THROUGH THURSDAY/...
-- Changed Discussion --
Short Term...Early morning fog in the interior valleys will lift this morning. Expect VFR conditions area wide today, with more widespread valley fog tonight. Lebanon and Whitefield are certain to get in on the fog, but it may spread to Concord as well. Long Term... Tue PM - Wed AM...areas of MVFR in -shra/-tsra with the same late Thu into Fri.
-- End Changed Discussion --
&& .MARINE...
-- Changed Discussion --
Short Term...A cold front shifts the winds to the west today, but they will remain fairly light. High pressure crosses the waters on Monday. Long Term...SCA conditions will be possible late in the week and into next weekend.
-- End Changed Discussion --
&& .EQUIPMENT...
-- Changed Discussion --
The weather radar at Gray (GYX) will be down for maintenance for approximately two to three days, beginning today, Aug 13th. During that time technicians will be installing important upgrades. This work has been scheduled to minimize any potential impacts to office operations. During the outage, radar coverage is available from adjacent radar sites including Burlington-Vermont (KCXX), Taunton- Massachusetts (KBOX), and Hodgdon-Maine (KCBW). Also, the radar at Albany (KENX) suffered a failure that has been attributed to azimuthal motor/gear issues. It is expected to be down for several days.
-- End Changed Discussion --
&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Kimble SHORT TERM...Kimble LONG TERM...Ekster

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.