The chance of storms decreases as one moves southeastward as secondary low pressure takes over. Therefore, some interior areas, especially central and northern NH may see a few strong storms before frontal passage. Deep layer shear is projected to be 35 to 40 kt or so. Depending on frontal timing, building instability should be sufficient for thunderstorms. The cold front passes across the forecast area from NW to SE on Wednesday with some guidance indicating the possibility of low development along the front. This should allow for a relatively mild nigh with low level southwesterlies in place. High pressure will gradually slide offshore Tuesday night as a cold front approaches from the northwest. Little change to the going forecast during the extended period as latest deterministic and ensemble output remain largely unchanged. But inland, more widespread low to mid 70s look likely as sunshine prevails and the airmass in place gradually modifies. High pressure remains centered over Atlantic Canada, allowing for an onshore flow to keep the coastline cooler again. Tomorrow overall looks to be similar to today, but a few degrees warmer. Closer to the coast and through the urban areas, temperatures look to remain closer to 40 overnight. Temperatures look most likely to fall to 32 in the cool spots, but look unlikely to go much cooler due to the recent rainfall. Typical sheltered valleys are most likely to see the frost, with northern zones likely to see the most widespread frost. The ridge axis looks to cross through during the overnight hours, allowing for winds to die off and skies to remain clear. The dry airmass in place tonight will allow the threat for frost across a larger area tonight. Short Term - 6pm This Evening Through 6pm Tuesday The only exception may be along the south and east facing sides of the mountains through central New Hampshire, where upslope flow combining with daytime heating may lead to a few scattered showers this afternoon. Otherwise the weather conditions look quiet today as high pressure builds in from the north. This wind direction gradually shifts to east, keeping the coastline mainly in the 50s to low 60s today, while interior locations warm into the upper 60s to low 70s. A cold front passes through this morning, with drier air arriving on a northeasterly breeze.
#Noaa marine forecast bar harbor maine update#
The frost advisory was also dropped with this update as temperatures warm up for the day. The next chance of showers and perhaps some thunderstorms will be on Wednesday as a cold front moves through, followed by high pressure to close out the week.ħ:20AM Nudged the winds up a little bit for the frontal passage this morning, but otherwise no major changes with this update as the forecast remains on track. High pressure builds in from the north today in the wake of a cold front, setting up another dry period of weather early this week with seasonable high temperatures and cool overnight lows.
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