Area Forecast Discussion
Issued by NWS Portland, ME

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580 FXUS61 KGYX 271330 AFDGYX Area Forecast Discussion National Weather Service Gray ME 930 AM EDT WED JUL 27 2016 .SYNOPSIS... Warm high pressure remains over the area today with temperatures warming into the 80s and 90s. A weak frontal boundary will drop south out of Canada and into northern New England tonight into Thursday, bringing a chance for showers and thunderstorms as it does so. The front slowly slips offshore on Friday as low pressure track easts along the front offshore of Cape Cod. This will bring another chance of showers Friday into Friday night. Cooler, more seasonable temperatures return for the weekend with additional periods of shower activity. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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925 am update: Skies remain clear across the region with strong due to strong subsidence under high pressure. These conditions will continue the rest of the day. Temperatures already well into the 70s at this time, so very warm to hot conditions expected. May need to bump up some max temperatures on the next update. Update... Have updated the grids to account for current conditions. Patchy fog has developed over a few locations early this morning. This should be lifting by around 8 am in most areas. Have made minor adjustments to temperatures, dew point values and winds. Otherwise, no significant changes to the forecast package. Prev disc... Any patchy early morning fog across the interior valleys will dissipate by 8 or 9 am. Otherwise, a westerly flow will continue ahead of a slow moving cold front today. 850 mb temperatures top out near +16C this afternoon. With nearly full sunshine, expect temperatures to rapidly climb once again mainly into the mid 80s over the north to lower 90s over the southern interior. The gradient flow will not be sufficiently strong today to keep sea breezes from forming along the coast during the late morning and early afternoon hours. This will allow temperatures to drop back several degrees along and near the coastline during the afternoon.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM THURSDAY/... Cloudiness and scattered shower activity will begin to reach the northern mountains by late tonight as the surface cold front approaches from the northwest. Sufficient instability to allow for a few widely scattered thunderstorms late at night. By Thursday, scattered showers and thunderstorms throughout portions of Maine and New Hampshire will gradually spread southward to the coastline by evening. By Thursday night, the front will become quasi-stationary along the coastal waters with showers and storms rippling northeastward along the front. The best chance for a thunderstorm will be early in the evening. Areas where any precipitation occurs will be vulnerable to patchy fog later Thursday night. This fog will be in combination with a gradual increase in dew point values over the next 36 hours. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... The models are in general agreement on the long wave pattern through early next week. A weak broad trough will offer some relief from the heat early in the period as a slow-moving cold front drops south across the area. The front will cross the area Thursday night and Friday. A weak low will travel northeast along this front Friday night before it finally clears the coast early Saturday. High pressure and drier air follows for Saturday and Sunday. By Monday...the high will slide offshore with return flow and rising heights allowing the heat and humidity to gradually build as we head through next week. && .AVIATION /14Z WEDNESDAY THROUGH SUNDAY/... Short Term...VFR conditions are expected tonight, except for perhaps a few hours of valley fog early this morning. Long Term... Thu Night - Sat am...Areas of MVFR IN shra/tsra. && .MARINE... Short Term...Conditions are expected to remain below small craft thresholds through Thursday. Long Term... Winds and seas are expected to remain below small craft threshold. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.