Sep 21, 2015 11:40 PM
NH1 Weather Insider with Joe Joyce: September 22, 2015
NH1 Chief Meteorologist
Another cool start to the day with lows in the 40's, patchy dense fog and high-mid level clouds in place. A few colder spots in the NW valleys may even have some early morning frost to wake up to! An upper level trough in the eastern US is directing a flow of clouds up the east coast and into New England. While showers are not in the forecast, These high-mid level clouds will help to create a grey blanket across the sky during the morning. I do expect a thinning overcast during the afternoon with breaks of sun west to east. High pressure centered over Maine will be wrapping in a light NE flow off the water and supplying low level dry air. Water temps are in the mid 60's. The flow coming in off the ocean along with the thin overcast will help to keep temps in the 60's to near 70 Tuesday. Some filtered sunshine through a thinner overcast will be possible in the afternoon with temps closer to 70 degrees inland away from the cool onshore wind.
Skies will clear Tuesday night for another cool night in the 40's. Weak high pressure holds on for Wednesday. A NW land breeze develops which will help to make for a warmer day with highs in the mid 70's in the sunshine. But just as quickly as we warm up, another front will push through Wednesday night. Building high pressure will settle in from Canada, bringing a reinforcing shot of cooler, dry air with winds again shifting onshore with a cool wind off the water. It is a dry pleasant pattern of weather for the middle to end of the week. Plenty of sunshine with temps cooling from the midweek 70's into the 60's heading into the weekend.
A low will try to spin up the coastline during the weekend, but high pressure will remain strong over our heads. Temps will remain in the 60's this weekend with sunny to Partly sunny skies. If the low to our south gets closer to us, we could see more clouds by Monday. Either way, with a persistent onshore flow off the water, we will have to watch for some tricky low level clouds/moisture which can back in off the water from time to time this weekend. I expect a very nice, dry pleasant fall-feeling weekend for this first weekend of fall. The dry pattern will persist likely through the end of the month of September...with temps likely to hover near the normal for this time of year. No big warmth for the rest of the month, though October is showing signs of a return of the warmth! This could mean some very nice Indian Summer weather as temps will continue to cool on those clear calm nights, and frosty evening become more regular...