National Weather Service (2024)

Area Forecast Discussion
Issued by NWS Portland, ME

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-- Discussion containing changed information from previous version are highlighted. --036FXUS61 KGYX 301522 AABAFDGYXArea Forecast Discussion...UPDATEDNational Weather Service Gray ME1122 AM EDT Thu May 30 2024.SYNOPSIS...
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Showers will continue across southern areas into the earlyafternoon before tapering off as low pressure passes southeastof the region. High pressure crosses the region this weekendand builds to the south early next week. This will provide dryand warmer conditions.
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1120 AM Update: Have lowered near term temperatures and raiseddewpoints in the areas with rain showers late this morning whichlooks to be just a tad slower in departing than previousforecast. This will delay daytime highs until mid/late afternoonwhen clearing arrives for the northwest. No other significantchanges to the forecast at this time.930 AM Update: Going forecast remains in good shape withadjustments mainly to near term temperatures/dewpoints. Rain hasjust about made its most northerly reach this hour with 12Z GYXRAOB showing dry airmass immediately to the north that will winout as the day goes on and offshore low pressure continues topull east. Clouds keeping temperatures cool with a gradual northto south clearing trend expected to begin this afternoon.615 AM Update...Have adjusted PoPs across southern NH and theimmediate coast of ME just a little bit here early this morningbased on latest trends in radar data. Otherwise, forecastremains on track, with the bulk of the showers in the southmoving offshore this morning.Previously...Weak low pressure near NYC early this morning will tracknortheastward along a stalled out SFC front as the morning andearly afternoon progresses. Weak lift and positive moistureadvection above the SFC front will allow for some of the showerscurrently over CT to move northeastward and affect southeasternNH and portions of coastal Maine this morning into the earlyafternoon hours. A few downpours will be possible with a rumbleof thunder or two not out of the question. Away from thesecoastal areas, we`ll just deal with some clouds withtemperatures rebounding to near 70F. There will be a short wavetrough moving across the region in the wake of the surface lowthis afternoon and this may aid in the development of someconvective showers this afternoon.
-- End Changed Discussion --&&.SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/...Skies clear out tonight with high pressure moving in. This willallow for some radiational cooling, especially in the farinterior where some patchy frost will be possible.Partly to mostly sunny skies are expected on Friday with a freshwest wind and highs reaching the 70s at many locations.&&.LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/...Overview: Mainly dry conditions and near seasonable temperatures areexpected through early next week before shower chances increasetowards mid-week as a frontal system approaches from the west.Impacts: Little to no major weather related impacts are expected.Forecast Details: Mainly clear skies on Friday night combinedwith weak flow may allow for good radiational coolingconditions. As such, blended in some MOS guidance to overnightlow temperature forecast. This places northern valleys into theupper 30s with low to middle 40s elsewhere. Some valley fogcould develop overnight as well.High pressure will continue to build over the area on Saturday andSaturday night as a weak sfc warm front lifts northward. Saturdaywill feature partly to mostly sunny skies and warm high temperaturesinto the 70s to near 80 degrees with lows into the 40s to lower 50s.Temperatures aloft warm some on Sunday with 850 mb temperaturesclimbing to around +12C. This combined with afternoon mixing willallow highs to reach the lower to middle 80s, although cooler alongthe coast and mtns. Sunday night will be comfortable with lows intothe 50s. Dry conditions and mild temperatures then look to continueon Monday and Tuesday before shower chances increase towards themiddle of next week as a frontal boundary approaches from thewest.&&.AVIATION /15Z THURSDAY THROUGH MONDAY/...Short Term...A period of MVFR cigs are possible this morning atKMHT/KPSM as low pressure passes to our S. Otherwise, mainlyVFR expected through Friday. Some valley fog possible at KHIEtonight.Long Term...VFR conditions will prevail Friday night throughMonday. The exception could be on Friday night into earlySaturday at KHIE and KLEB due to valley nighttime fog. Windswill be primarily out of the west- northwest at 10-15 kts,although a sea breeze could develop most days with windsbecoming southerly at KPSM, KPWM, and KRKD.&&.MARINE...Short Term...Low pressure passes just S of the waters today,but winds/seas stay below SCA criteria.Long Term....Winds and seas to remain below SCA thresholds ashigh pressure builds south of the waters. Some marine fog willbe possible at times, especially at night.&&.GYX WATCHES/WARNINGS/ADVISORIES...ME...None.NH...None.MARINE...None.&&$$NEAR TERM UPDATE...ARNOTT