Area Forecast Discussion
Issued by NWS Portland, ME

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457 FXUS61 KGYX 240041 AAC AFDGYX Area Forecast Discussion...UPDATED National Weather Service Gray ME 841 PM EDT Sat Sep 23 2017 .SYNOPSIS... Very warm high pressure will continue to build across the region and remain into Tuesday night and perhaps even Wednesday. This will mean much warmer than normal temperatures during the daytime hours, with a few inland record highs possible. A cold front looks to sweep across the region late Wednesday or Thursday with showers and possible thunder. It will also bring much cooler air into the region for late week. At this time it looks like Hurricane Maria will not be a threat to our region thanks to the cold front sweeping her out to sea well to our south. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/... 840 PM Update... Only minor changes to the forecast to tweak overnight temperatures. We should radiate well tonight with lows in the 50s and 60s. 625 PM Update... Adjusted temperatures and dew points this update based on current trends. Temperatures are dropping quickly in the dry air mass. Also added fog to the valleys and offshore where moisture will pool north of Jose in the form of fog and stratus. A Climate section was added below to mention Concord`s potential for record high temperatures tomorrow and Monday. Please see below for more details. Previous discussion... High pressure will continue to build into New England from the west this evening. This will mean our fair and warm weather will continue into the evening hours. Radiational cooling will likely take place tonight with temperatures heading back down into the 50s and 60s. However, this is still above normal. Valley fog is expected across the interior tonight, along with a brief period of stratus possible on the mid coast. Otherwise, the weather will remain dry. && .SHORT TERM /6 AM SUNDAY MORNING THROUGH 6 PM SUNDAY/... High pressure continues to build across the region Sunday with fair weather and very warm to hot temperatures. The immediate coast will cool off with a seabreeze during the afternoon hours. However, the rest of the region will likely see highs in the mid to upper 80s - with a few 90 degree readings certainly possible. The record high at KCON on Sunday is 89...and that is the number we are currently forecasting. Dewpoints will be in the 60s, but not high enough to allow for heat indices much higher than the actual temperatures. Sunday night will feature mostly clear skies and temperatures falling back into the 50s and 60s with valley fog likely once again. && .LONG TERM /SUNDAY NIGHT THROUGH SATURDAY/... High pressure will remain in control over the northeast for Monday and Tuesday with high temperatures well above normal. Expect mostly sunny skies both days with inland highs on Monday in the mid 80s to near 90. A sea breeze will cap temps along the coast in the upper 70s to lower 80s. Highs on Tuesday will reach the lower to mid 80s inland with mid to upper 70s along the coast. Lows overnight will range from the mid 50s to mid 60s. Cold front will approach from the northwest on Wednesday. Looking for a mix of sun and clouds and possibly a late day shower or thunderstorm in northwest zones...however K indexes suggesting moisture may be a limiting factor. Highs on Wednesday will range from the mid 70s to lower 80s. Cold front will gradually push into the region Wednesday night bringing clouds and showers and possibly a stray thunderstorm... mainly after midnight. Lows will range from the mid 50s to lower 60s. Cold front will slowly push offshore on Thursday. Looking for clouds during the morning and into the afternoon in southern zones with clearing from north to south during the late afternoon and evening. Highs Thursday will range from the mid 60s north to the mid 70s south. Weak surface ridging will nose in from the west Thursday night bringing mostly clear skies and much cooler temps. Lows will range from the mid 40s north to the mid 50s south. Fair weather will continue on Friday with highs ranging through the 60s. && .AVIATION /00Z SUNDAY THROUGH THURSDAY/... Short Term /through Sunday Night/...VFR conditions except some Lcl LIFR btw 09z-12z Sunday and Monday along the CT River Valley in stratus and fog. A brief period of low stratus will be possible at RKD late tonight as well. Long Term... VFR Monday through Wednesday. Areas of MFR ceilings Wednesday night and Thursday. && .MARINE... Short Term /through Sunday Night/...SCA for seas will expire at 00z this evening as seas continue to subside. Otherwise, sub-SCA conditions are expected through Sunday night with some maritime fog possible. Long Term... No problems noted. && .TIDES/COASTAL FLOODING... There is a moderate risk of rip currents through Sunday on all area beaches. && .CLIMATE... Sunday and Monday`s high temperature records may be in jeopardy in NH. The record for Sunday, the 24th in Concord NH is 90 degrees and occurred in 2010; the record for Monday, the 25th in Concord NH is 89 degrees and occurred in 1970. The forecasted high for both days is 89 degrees. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Hanes SHORT TERM...Ekster LONG TERM...Sinsabaugh

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