Area Forecast Discussion
Issued by NWS Caribou, ME

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000 FXUS61 KCAR 220318 AFDCAR Area Forecast Discussion National Weather Service Caribou ME 1118 PM EDT SUN AUG 21 2016 .SYNOPSIS... A strong cold front will approach tonight and cross the region Monday morning. High pressure will build south of the area Tuesday into Wednesday. && .NEAR TERM /THROUGH MONDAY/...
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11:20 PM Update...Raised temps just a bit early in the overnight period. Otherwise, forecast is on track with band of rain now moving into western areas. The breeze, moisture and increasing clouds will keep temps mild overnight. Periods of heavy rain expected later tonight into Monday morning. Low clouds and areas of fog over the coastal waters has pushed its way onshore across the coastal region into portion of interior Downeast Maine as seen on the latest visible satellite imagery. Most of this appears to be thinning out per the last few frames. That onshore flow has kept the coast cool today w/readings only hitting the upper 60s. Further inland and on n, temps well into the 70s to around 80 w/the s wind. Clouds will be back on the increase this evening ahead of apchg cold front. 18Z analysis had the front draped back across the Ottawa and Ontario region. 12Z UA showed upper low somewhat paralleling the front, so forward progress of the front will be slower than what the guidance is advertising. Therefore, backed up the timing of the rainfall by a least 2 hrs given this setup. Atmosphere is forecast to moisten up overnight w/pwats hitting 1.5+ inches w/a ssw flow through the column. A jetstreak of 40 kts residing at 700mbs will aid in the forcing w/potential for heavy rainfall. Leaned against convection overnight into early Monday as elevated instability marginal especially elevated CAPE around 200 joules at best. A wave of low pres is still be shown by the short range guidance including the NAM12 and GFS to link up on the front early Monday. This will keep steady rain going a while longer and hold up the front some. Based on this thinking, kept steady rain going into late morning and then transitioned things to showers. Some instability is around early but again marginal, so attm, stayed away from the mention of thunder. The later shifts can assess this further w/the latest guidance. Collaborated w/the NERFC and GYX on rainfall amounts and generally 0.50 to 1.00 inches basin average. Some sites could see 1.25 inches especially in the upslope areas such as Mt. Katahdin and the Piscataquis region. It will be much cooler on Monday w/daytime temps in the lower to mid 70s.
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&& .SHORT TERM /MONDAY NIGHT THROUGH WEDNESDAY/... Strong high pressure will to build in from the west Monday Night. This system will then pass to the south of New England Tuesday Night then move to the east into the Atlantic Wednesday and Thursday. This system is expected to bring dry conditions into Thursday. && .LONG TERM /WEDNESDAY NIGHT THROUGH SUNDAY/... A cold front will approach from the west Thursday Night then cross the region Friday bring some showers. A weak area of low pressure may develop along this front as it moves through keeping showers over the region into early Saturday. Strong high pressure is then expected to move in from the west late Saturday and Sunday. && .AVIATION /03Z MONDAY THROUGH FRIDAY/... NEAR TERM: VFR for the northern terminals this evening going to MVFR and then IFR into late Monday morning. A quick improvement is expected by the afternoon to MVFR and then VFR. For KBGR and KBHB, MVFR going to IFR tonight into Monday morning. Improvement expected to VFR by later in the morning. SHORT TERM: Expect VFR conditions Monday Night through Wednesday Night. MVFR conditions are expected Thursday. && .MARINE... NEAR TERM: No headlines this period. S winds are around 10 kts attm w/seas of 1-2 ft. A slight build in the seas is expected overnight w/heights going to 3 ft as winds increase to around 15 kts. Winds to veer to a w direction Monday afternoon w/speeds dropping off and seas coming down to around 2 ft. SHORT TERM: Have used the NAM12 to initialize the sustained winds Monday Night through Wednesday then transition to the Super Blend Winds. For Waves: There continues to be some very long period swell generated by tropical system well to the south and east of the waters, however the wave height from this wave group is under 1 foot. The primary wave group from Tuesday night through Friday will continue to be dominate by local wind wave. Will populate wave grids with the Near Shore Wave Model through Wednesday. Boundary conditions look reasonable so will not make any adjustments. Will transition to the Wave Watch III late Wednesday. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...None. && $$ Near Term...Hewitt/Dumont/MCB Short Term...Mignone Long Term...Mignone Aviation...Hewitt/Dumont/Mignone Marine...Hewitt/Dumont/Mignone is the U.S. government's official web portal to all federal, state and local government web resources and services.