Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 141304 AFDGYX Area Forecast Discussion National Weather Service Gray ME 904 AM EDT Wed Mar 14 2018 .SYNOPSIS... Low pressure will slowly pull away from the region today, but occasional snow and snow showers will remain. Thereafter, for there rest of the week and into the weekend, mainly fair weather is expected with little in the way of precipitation except for upslope favored locations in the mountains. A storm system looks to pass to our south mid next week but bears watching. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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Update... Latest Radar imagery continues to show snow backing into much of Maine and New Hampshire from the system in the Canadian Maritimes. The exception this morning continues to be southern New Hampshire where a drier westerly flow will only allow for scattered snow showers for the rest of this morning. Light to occasionally moderate snow will continue in most areas today. In addition, all areas will have the threat for a passing snow squall during the afternoon, with the greatest likelihood in the north and mountains. Prev Disc... 7am update... Light snow bands continue across much of the CWA this morning. Advisories have been extended to 2pm and the warnings ending at 12Z will be converted to advisories. Overall the additional accumulation won`t be too significant but as temperatures warm the snow has become wetter and more slippery and thus will continue the advisory through midday. prev... While SFC low pressure continues to move away from the forecast area today, upper level low pressure will dive in. We are likely currently seeing some of the forcing for ascent associated with this feature early this morning with a few snow bands increasing in intensity as of 0630z. These will likely provide for more accumulating snow early this morning, especially from KLEB-KPWM on northward. Therefore, winter storm warnings and advisories remain in effect except for southernmost zones through at least 12z this morning. The dayshift may need to extend some of the advisory area based on radar trends after sunrise. However, most southern and central zones should see temperatures rise sufficiently above freezing to mitigate additional accumulations on roadways. Further north, in the mountains, winter storm warnings continue through 18z today as wrap around moisture should allow for more robust accumulating snow. Our storm total snowfall map out on the web will reflect additional snow accumulations from 12z this morning through early this evening. Even with steady stratiform snow ending across many areas this morning, the column will become weakly unstable for the balance of the day. This will be due to very cold temperatures aloft moving in with the upper level low. Therefore, we do expect occasional snow showers and squalls to occur from time to time all areas today. It would not completely surprise me to receive a report or two of thunder this afternoon. Local bursts of brief heavy snow may make travel a bit slick at times. Otherwise, strongest winds are expected to be over southern zones with gusts around 30 mph likely today.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH THURSDAY NIGHT/... Snow showers will likely continue through much of tonight in many areas as the upper level low makes its closest pass just to our south. We cannot completely rule out a brief period of steady stratiform snow this evening as forcing becomes a little more widespread. Not out of the question that slippery spots continue well into the evening. The upper level low continues to move east Thursday with improving conditions. However, the mountains are expected to continue to pick up accumulating snows, especially on nw facing slopes. Gusty winds are expected to continue right through the day on Thursday. && .LONG TERM /FRIDAY THROUGH TUESDAY/... Fairly quiet patter through the first part of next week. An upper level low will slowly drift east of the region keeping cool temperatures and northwesterly flow across the area. The upslope snow showers will persist through Friday before finally starting to decrease in coverage as the forcing from teh upper level low moves east by Saturday night. Saturday and Sunday will be mostly sunny with high temperatures climbing back above freezing for all but the northern mountains. Weak high pressure builds into the region on Monday into Tuesday keeping the mostly sunny skies around for the start of the week. An upper level pattern shift takes shape for the middle of next week. The persistent trough to our east remains but now another low starts to move in from the west undercutting the ridge which has been over the western portion of the CONUS and ushering in the start of cut off low season. This could bring another storm to the region by mid week. && .AVIATION /13Z WEDNESDAY THROUGH SUNDAY/... Short Term /through Thursday/...MVFR conditions should prevail today in snow showers and lower clouds. However, in the mountains, more IFR conditions should persist as snow continues. Occasional MVFR conditions are expected today into Thursday morning. Long Term...MVFR in SHSN for the mountains holds through Friday night before conditions become VFR everywhere through next week. && .MARINE... Short Term /through Thursday...Winds should continue to drop early this morning. However, winds are expected to increase again this afternoon so gales will remain in place on the ocean waters. Long Term...Persistent Northwesterly flow may still require small craft advisories through Friday. Calmer conditions move over the waters as high pressure moves in for the start of next week. && .TIDES/COASTAL FLOODING...
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Have issued a coastal flood statement for this morning. Despite low astronomical tides, large, long period swells will continue to strike the coast this morning leading to some beach erosion and splash-over.
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&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...Winter Weather Advisory until 2 PM EDT this afternoon for MEZ012-018>020-023>028. Winter Storm Warning until 2 PM EDT this afternoon for MEZ007>009-013-014-021-022. NH...Winter Weather Advisory until 2 PM EDT this afternoon for NHZ003>006-009-010. Winter Storm Warning until 2 PM EDT this afternoon for NHZ001- 002. MARINE...Small Craft Advisory until 8 PM EDT this evening for ANZ151- 153. Gale Warning until 8 PM EDT this evening for ANZ150-152-154. && $$ JC is the U.S. government's official web portal to all federal, state and local government web resources and services.