Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 252155 AFDGYX Area Forecast Discussion National Weather Service Gray ME 555 PM EDT Sun Sep 25 2016 .SYNOPSIS... Cold high pressure crosses the region tonight. Most towns away from the coast will see their first frost or freezing temperatures tonight. A approaching cold front brings showers through the area on Monday night and Tuesday. Drier weather returns for midweek. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
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6 PM Update...Just a few minor adjustments to the going forecast, mainly to sky cover. Most cyclonic flow in the mid levels is allowing bkn clouds to hang tough generally along and north of a line from gyx to hie. These should gradually thin over the next few hours. Otherwise, no significant changes. Previously... Sfc high noses in from the west overnight, and this will set up mainly clear and chilly conditions, as winds die off quickly after sunset in most places. May see light NW flow linger closer to the coast, with lows in the upper 30s to around 40 on the coast and in interior seacoast NH. Frost/freeze products issued for all but coastal zones, the urban corridor of the Merrimack valley in Hillsborough, and Rockingham county. Could see some patchy frost in central and northern Rockingham, and even in some colder spots in the coastal zones, but overall should be limited in these areas. Will likely see some fog develop in the mountain valleys and CT valley.
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&& .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Monday will see the high shift offshore in the afternoon and a weak SW flow begin to develop. Skies will be mainly sunny with some encroaching cirrus late. Temps will be a little warmer than Sunday. Should see a sea breeze develop along the immediate coast, but with light winds inland, this will only a have a couple degree effect on max temps in the area, given SSTs around or just above 60F. Approaching cold front overspreads clouds across the region Monday night, with showers moving in after midnight lingering into Tuesday morning. Lows will likely occur around or before midnight, but will be warmer than previous nights, ranging from the mid 40s to low 50s. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Models are still fairly in line through Wednesday. There is uncertainty towards the end of the week on if we will be dry or wet into the weekend. This all depends on were the low pressure forms later on in the week and if it stays far enough offshore as it moves northeast ward. Tuesday will be showery with the frontal passage during the day. As high pressure builds into the northeast, Wednesday and part of Thursday look dry. Uncertainty in the placement/movement of the low pressure may cause rain showers and cloudier skies on Thursday through Friday. Will keep chance PoPs for this time frame. Temperatures will be near normal for this time of season. && .AVIATION /22Z SUNDAY THROUGH FRIDAY/... Short Term...Winds diminish around sunset across the entire area. VFR through Monday evening, except for valley fog at KHIE/KLEB tonight. Flight restrictions possible after midnight Monday night as showers move in from the west. Long Term...MVFR or IFR conditions possible in showers will occur on Tuesday as a cold front moves northeast. Low level moisture from Tuesday showers will allow for patchy fog in the morning on Wednesday. Valley fog is also possible on Thursday morning at KHIE and KLEB. && .MARINE... Short Term...Winds/seas diminish tonight and Tuesday, but will still start to increase from the SW Monday night, although remaining below SCA levels. Long Term...Southerly flow over the waters will transition to northeast flow during midweek. Over the week, wave heights will range from 3 to 8 feet with the highest waves being toward the end of the week. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...Freeze Warning from midnight tonight to 8 AM EDT Monday for MEZ007>009. Frost Advisory from midnight tonight to 8 AM EDT Monday for MEZ012>014-018>022. NH...Freeze Warning from midnight tonight to 8 AM EDT Monday for NHZ001>003. Frost Advisory from midnight tonight to 8 AM EDT Monday for NHZ004>011-015. MARINE...None. && $$ NEAR TERM UPDATE...Ekster SHORT TERM...Cempa LONG TERM...Becker AVIATION...Becker/Cempa MARINE...Becker/Cempa

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