Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 141216 AAA AFDGYX Area Forecast Discussion...UPDATED National Weather Service Gray ME 716 AM EST Thu Dec 14 2017 .SYNOPSIS... Weak high pressure builds across the region today while a weak disturbance moves by to our south. Our weather will be punctuated by fast moving systems moving across the region, with temperatures running below normal through the weekend. There will be a chance for some snow showers on Friday night, and another chance of snow showers or light snow Monday into Tuesday. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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Update...S/WV trof passing S of the forecast area...but plenty of high and mid level clouds this morning. I have increased sky cover a little in the grids thru about mid morning. Also made some minor changes to temps and dew points based on latest observational trends. Previous discussion...The main wx maker will pass to our S today. A fast moving S/WV trof will squeeze under the main upper low and spread light snow across Srn New England. The forecast area looks like it will remain between the two systems...but some very light...non- accumulating snow cannot be ruled out for far Srn NH. Otherwise clouds will gradually decrease thru the day...but despite some sun continued CAA will keep temps from climbing out of the teens and 20s.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... Weak high pressure and S/WV ridging aloft will work into the area tonight thru Fri. Relaxing the gradient flow will allow for another chilly night...with widespread single digits to lower teens expected. Fri shallow mixing under the surface high will also keep readings chilly...not making it out of the 20s. We will have to watch late in the period...when the next approaching S/WV trof may try and spread clouds and snow showers into Wrn zones...but this looks to be mainly after 00z. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Mean Long wave trof remains over the eastern CONUS into the weekend with very cold temps before briefly becoming more zonal and allowing not so cold temps briefly early next week. By late Monday and Tuesday a series of weak short waves will once again begin to amplify and broaden the long wave trof over southeast Canada and the northeast CONUS bringing a return to much colder temps and scattered snow showers or maybe even a period of light snow sometime late Mon and into Tue depending on timing of models. Very limited moisture will accompany all these systems so nothing much in the way of any accumulations foreseen. && .AVIATION /12Z THURSDAY THROUGH MONDAY/... Short Term...Widespread VFR conditions expected thru Fri. A weak area of low pressure will pass S of the forecast area today...but only high to mid level clouds are expected across Srn NH. Wly winds will remain gusty today...with surface gusts up to 20 kts. Surface high pressure and S/WV ridging aloft will move in for Fri. Long Term...Mainly VFR through the weekend. MVFR conditions possible Fri night into Sat at KHIE in -shsn. && .MARINE... Short Term...Wly winds will remain gusty...but generally begin to slowly diminish thru tonight. Gale warnings have been replaced by SCAs thru Fri morning. Long Term...SCA may be needed in NW flow behind a cold front Sat into Sat night. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until 7 AM EST Friday for ANZ150>154. && $$ NEAR TERM...Legro SHORT TERM...Legro LONG TERM...Marine AVIATION...Legro/Marine MARINE...Legro/Marine is the U.S. government's official web portal to all federal, state and local government web resources and services.