Area Forecast Discussion
Issued by NWS Portland, ME

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620 FXUS61 KGYX 161122 AFDGYX Area Forecast Discussion National Weather Service Gray ME 622 AM EST Sat Dec 16 2017 .SYNOPSIS... High pressure builds into the region today through Sunday. Two weak waves will move through early next week bringing scattered snow showers except rain or snow showers over southernmost areas. It cools down again late in the week as Canadian high pressure builds southeast into the region. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... 620 am Update: Skies have cleared over most southern and central areas while clouds continue in the mountains with scattered flurries. Have made some adjustments for less cloud cover over southern areas today. No other changes needed at this time. Previous Discussion: The early morning area of light snow along the midcoast associated with a weak trof will exit by morning. Today will not be as cold ahead of an approaching cold front. Temperatures may rise into the 30s in southern and coastal areas while remaining in the 20s elsewhere. Scattered snow showers will continue in the mountains and foothills with little or no accumulations expected. Plenty of clouds are expected elsewhere as a cold front moves through the region later in the day. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... Tonight - High pressure builds across the region behind the cold front allowing clearing skies to take place. Colder temps will arrive with overnight lows in the single numbers and teens. Sunday will be a mostly sunny day as high pressure crests over the area. Temps will be mainly in the 20s. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Zonal flow will be in place through Tuesday evening when shallow troughing is carved out of the Great Lakes region, into the midwestern states, and towards the northeast. A weak trough of low pressure will bring scattered snow to the region Sunday night into Monday. On Tuesday a frontal system far removed from the parent surface low will bring snow and rain chances to the region through Wednesday morning. Residual snow showers will continue in the mountains through early Thursday morning. Thereafter the upper level pattern will calm down once again with less meridional features...but still fast moving energy from time to time. Thursday will see brief ridging building in. A baroclinic leaf will begin forming over the central CONUS, heralding the next low pressure system that will affect northern New England next Friday with scattered showers. As far as temperatures...cooler weather continues into Monday for highs (20s and lower 30s). A brief warming trend begins Tuesday with SW winds in place...boosting readings into the mid to upper 30s north to mid 40s south for highs. Highs in the mid/upper 20s north to mid/upper 30s south are forecast on Wednesday...and will be diminished to the teens north to lower 30s south on Thursday behind a cold front. A warm front encroaching on the area will bring temperatures up once again on Friday. && .AVIATION /12Z SATURDAY THROUGH WEDNESDAY/... Short Term...VFR conditions. Long Term...Mainly VFR Sunday night through Wednesday, although could we see temporary flight restrictions SW to NE in SHSN Monday, transitioning to SHRASN on Tue. && .MARINE... Short Term...Northwest winds will increase today into tonight as high pressure builds in behind the cold front. SCAs over the outer waters are in effect. Winds will slowly diminish tonight. High pressure settles over the waters Sunday. Long Term...SCA conditions are likely Tuesday night for the outer waters, becoming gales on Wednesday. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until midnight EST tonight for ANZ150-152- 154. && $$ NEAR TERM...Marine SHORT TERM...Marine LONG TERM...Hanes

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