Area Forecast Discussion
Issued by NWS Caribou, ME
Issued by NWS Caribou, ME
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896 FXUS61 KCAR 292140 AFDCAR Area Forecast Discussion National Weather Service Caribou ME 540 PM EDT Sat Jun 29 2024 .SYNOPSIS... High pressure will exit across the Maritimes overnight. A warm front lifts to the north late tonight, followed by a cold front crossing the region Sunday into Sunday night. High pressure then builds through Wednesday. && .NEAR TERM /THROUGH SUNDAY/... 540 PM Update: In this update, we provided a little more continuity of higher PoPs with the 29/18-24z and 30/00-06z 6hrly QPF bullseye value(s) as it crosses the FA. Otherwise, fcst hrly temps/dwpts were updated into the late Eve hrs from latest avbl late Aftn sfc obs, which has shown more in the way of rn cooled air temps than we had attm in the prev fcst update. No chgs were made to Ovrngt lows, with mstly steady temps xpctd thru the Ovrngt. Prev Disc: Showers are impacting entire region as PW values increase toward 2 inches over the area this evening. Embedded storms that may be able to develop in elevated instability will have the potential to produce locally heavy rainfall. Cold front will be located along the St. Lawrence Seaway by 12z with warm advection showers exiting into New Brunswick by this time. This will likely result in clouds breaking up by late morning and into the early afternoon ahead of cold front moving through. All parameters appear to be in place for an outbreak of severe weather tomorrow afternoon. CAPE values range from 500-1500 in the afternoon, 0-6km shear values of 50-60kts, with slightly curved hodographs. Hires CAMS are giving line of convection with bowing segments possible. Given the low-level shear and helicity values, cannot rule out an isolated tornado but the main threat will be damaging winds tomorrow afternoon. The only caveat will be the puny mid-level lapse rates expected of around 6 C/km. However given the dynamics of the system along the front and in RRQ of 120+ kt jet forcing should be able to overcome the weaker lapse rates. Cold front should move offshore Sunday evening with showers winding down with perhaps an isolated storm still present along the coast. && .SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY/... The cold front will exit the coast Sunday evening. Any lingering showers and thunderstorms will be moving away from the region through early evening. A large area of high pressure will build toward the region Sunday night with with partial clearing and much drier air moving back in behind the front. Lows will fall into the low to mid 50s across the north and the upper 50s for the Bangor region. High pressure will then continue to build in Monday through Tuesday. Expect partly to mostly sunny skies both days, along with mainly clear skies for Monday night. Highs on Monday will range from the mid to upper 70s and then warm into the lower 80s by Tuesday. Low Monday night are expected to be in the low to mid 50s. && .LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/... Fair weather continues Tuesday night into Wednesday as high pressure builds to our south. A warm front will approach later Wednesday evening and cross the the area Wednesday night. This will be followed by a weak cold front on Thursday. Expect the chance for showers Wednesday night and Thursday with the cold front. High pressure builds back in on Friday. Another low approaches Friday night and Saturday. Afternoon highs will average a bit above normal this time of year in the lower 80s. && .AVIATION /22Z SATURDAY THROUGH THURSDAY/... NEAR TERM: VFR diminishing to MVFR/IFR this evening. Rain moves in after 00z tonight with IFR fog/cigs impacting terminals late this evening. Cannot rule out VCTS at BGR late but very little confidence to include with this forecast. LLWS will be present at all terminals tonight at FL020 from the south 40-55kts. SHORT TERM: Sun night...MVFR or lower possible early toward KBGR/KBHB in lingering SHRA/TSRA, otherwise VFR. NW to N wind 5 to 10 kt. Mon through Wed...VFR. NW to N wind through Monday night becoming W to SW Tue/Wed. Wed night and Thu...VFR/MVFR. Chance showers. && .MARINE... NEAR TERM: Winds will pick up from the south this evening over all waters, continuing through the afternoon on Sunday. Seas increase above 5ft late this evening and remain above sca levels through the day on Sunday. SHORT TERM: Seas may still range from 4 to 6 feet with gusts up to 25 kt early across the outer waters, otherwise winds/seas will remain below SCA levels through period. && .CAR WATCHES/WARNINGS/ADVISORIES... ME...None. MARINE...Small Craft Advisory until 2 AM EDT Monday for ANZ050>052. && $$ Near Term...VJN Short Term...TWD Long Term...TWD Aviation...VJN/TWD Marine...VJN/TWD