Area Forecast Discussion
Issued by NWS Caribou, ME
Issued by NWS Caribou, ME
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362 FXUS61 KCAR 102041 AFDCAR Area Forecast Discussion National Weather Service Caribou ME 441 PM EDT Wed Jul 10 2024 .SYNOPSIS... Low pressure and remnant moisture from Beryl will cross the region tonight into Friday. A frontal boundary will stall across the region Friday night into Saturday. High pressure will cross the region Sunday. A cold front will begin to approach later Monday. && .NEAR TERM /THROUGH THURSDAY/... The main story for tonight and Thursday will be the heavy rainfall from the remnants of Beryl progressing towards the area. For this evening, the initial tropical moisture will move into the west and progress east throughout the night. By tonight, high-res models and extended models are in good agreement with the heaviest band of rainfall moving slightly further north along the frontal boundary. This new heavy rain band is expected to stretch from the Central Highlands through Southern Aroostook, where the higher terrain will play a big part in supporting the rain. Thus, the Flood Watch has been extended into northern Somerset and northern Piscataquis to capture the higher rainfall (more details in the Hydrology section below). Though Coastal Downeast will still receive rain, onshore flow will help stabilize the area thus decreasing heavy rainfall amounts. Cannot rule out a thunderstorm producing locally heavy rain. Patchy to areas of fog throughout the night across the region. By Thursday, the heaviest rainfall will begin to end, however, rain showers will continue through much of the day. By the afternoon, guidance shows the center of the remnants of Beryl moving across the northern parts of the state. Upper air model soundings show instability developing along the boundary, however will be weakening with the remnant of Beryl exiting over the maritimes. Decided to keep isolated thunderstorms in the forecast for the north. Stability and areas of fog will be to high in the south for thunderstorms development. Temps in the upper 70s. && .SHORT TERM /THURSDAY NIGHT THROUGH SATURDAY/... Low pressure, the weakening remnants of Beryl, will cross the region Thursday night into Friday. The low will begin to draw a weak frontal boundary south across the region Friday. Expect likely showers north Thursday night, with a chance of mostly early showers Downeast. Low level moisture will also support areas of fog Thursday night. Expect mostly cloudy/partly sunny skies across northern areas Friday along with a chance of showers, slight chance of an afternoon thunderstorm. Expect partly sunny skies Downeast along with the slight chance of an afternoon shower/thunderstorm. The frontal boundary will reach the Downeast coast Friday night. Could still have a chance of showers Friday evening. Otherwise, expect generally partly cloudy skies along with patchy/areas of fog. The front should stall in the vicinity of the Downeast coast Saturday, while a disturbance crosses the Gulf of Maine. Expect partly sunny/mostly cloudy skies along with a chance of showers Downeast Saturday, along with the slight chance of an afternoon thunderstorm. Across northern areas, generally expect partly sunny skies. However, could have enough diurnal instability to also support the slight chance of an afternoon shower/thunderstorm. Expect above normal level temperatures Friday/Saturday. && .LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/... Could still have the slight chance of an early shower Saturday evening. Otherwise, expect partly cloudy/mostly clear skies Saturday night. High pressure will cross the region Sunday with mostly clear/partly cloudy skies. A warm front should cross the region Monday with a chance of afternoon showers/thunderstorms. A cold front is then expected to cross the region Tuesday/Wednesday, though timing differences still exist. Expect a chance of showers/thunderstorms Tuesday/Wednesday with diurnal instability and the possible proximity of the cold front. Expect above normal level temperatures Sunday through Wednesday. && .AVIATION /20Z WEDNESDAY THROUGH MONDAY/... NEAR TERM: Aroostook Terminals...VFR conditions this evening. Then quickly decreasing to MVFR after sunset, then IFR/LIFR after midnight in cigs/vsby due to rain showers with localized heavy rain. LLWS from midnight to Thursday morning. Light and variable winds. For Thursday, MVFR/IFR in cigs/vsby due to rain. E winds 5-10 kts. Downeast Terminals...VFR conditions early this evening, then quickly decreasing MVFR/IFR before sunset, then IFR/LIFR after sunset in cigs/vsby due to rain showers and areas/patchy fog. Light and variable winds. For Thursday, LIFR conditions in cigs/vsby due to rain and patchy fog. SHORT TERM: Thursday night...MVFR/IFR. Showers likely north, with a chance of mostly early showers Downeast. Slight chance of an early thunderstorm. Variable conditions with areas of fog. Variable winds 5 to 10 knots, becoming south/southwest. Friday...Variable conditions with any early fog. Otherwise, VFR/MVFR with a chance of showers north. Slight chance of an afternoon thunderstorm. Slight chance of an afternoon shower/thunderstorm Downeast. Southwest/west winds 10 to 15 knots. Friday night...Variable conditions with any fog. Otherwise, VFR. Slight chance of an early shower. West/southwest winds 5 to 10 knots. Saturday...Variable conditions with any fog early. Otherwise, generally VFR. Occasional MVFR Downeast. A chance of showers Downeast, slight chance north. Slight chance of an afternoon thunderstorm. West/southwest winds 5 to 10 knots. Saturday night...VFR. West/southwest winds 5 to 10 knots. Sunday through Sunday night...VFR. West/southwest winds 5 to 10 knots. Monday...VFR early, then VFR/MVFR with a chance of afternoon showers and thunderstorms. Southwest/south winds 5 to 10 knots. && .MARINE... NEAR TERM: Winds and seas will be below SCA conditions tonight. Winds increase Thursday morning to SCA conditions and remain for the day. Seas 3-4 ft. SHORT TERM: Small craft advisory conditions possible Thursday night into Friday night. A chance of showers Thursday night. A slight chance of showers Friday/Friday night. A chance of showers Saturday. Areas/patchy fog Thursday night into Saturday. && .HYDROLOGY... Potentially excessive rainfall may cause scattered flash flooding tonight into Thursday morning. Any flash flooding will be mainly localized impacting mainly vulnerable areas including urban areas, hilly terrain roads, small rivers, streams and creeks and washout prone locations including dirt/gravel roads and ATV trails. WPC has issued a Slight Risk Excessive Rainfall Outlook for a large portion of the CWA for tonight into Thursday morning. Soil moisture continues to run below normal across much of the Downeast and Central Highlands with well above normal conditions in portions of the North Woods into the Aroostook River Basin. Main stem rivers are not going to flood with this event. However, near record level PWATs, strong dynamical support and well efficient rainfall production (warm cloud layer 13-14.5kft) will be a concern for excessive rainfall. At this point the greatest concern will be in Penobscot County, Piscataquis County, Northern Somerset county as well as Southeast Aroostook county. A flood watch has been hoisted for this area beginning this evening through Thursday morning. However, cannot rule out the need for isolated flash flood warnings in areas outside of the watch or the need for expansion of the watch. Those planning on driving overnight, camping, hiking or riding ATV trails through these areas should stay alert to rapidly changing conditions this evening into Thursday morning. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...Flood Watch from 8 PM EDT this evening through Thursday morning for MEZ003>006-010-011-015-031-032. MARINE...None. && $$ Near Term...LaFlash Short Term...Norcross Long Term...Norcross Aviation...LaFlash/Norcross Marine...LaFlash/Norcross Hydrology...LaFlash/Sinko