Jun 8, 2016 12:51 AM
NH1 First Alert Weather: Cooler days ahead
NH1 Chief Meteorologist
Wednesday a trough of cold air aloft will move into the region. At the surface northwesterly wind will set up as the cold air pushes into the area. Tightening surface pressure gradients will result in a few gusts to 20mph. Some morning sun will give way to building clouds by late morning and afternoon. A few afternoon showers may form, especially in the north where upslope will assist. But also there is a good chance of stronger storms across Southern New England during the afternoon as an energized vort max will slide down from the Great lakes and track just south of New England. This will give a better chance of storms south, but a few may clip southern New Hampshire in the afternoon. Isolated thunder and small hail is possible as steep lapse rates remain in place with cooler air aloft. Highs on Wednesday will be in the 60's to lwr 70's possibly closer to the MA border
Cyclonic flow will continue Wednesday night into Friday as slow moving upper low gradually shifts east. Bottom line for the period will be mostly cloudy skies with occasional showers...mainly in the mountains and foothills. Periodic breaks of sun, especially in the morning and late in the day. Temperatures will average well below normal with lows overnight ranging through the 40s. Highs on Thursday will only reach the mid 50s to mid 60s. Temperatures will moderate slightly on Friday as a narrow ridge of high pressure slowly builds in from the west and clouds begin to diminish in the afternoon. Expect upper 50s to mid 60s north and mid 60s to near 70 south.
High pressure will shift offshore on Saturday. Weak high pressure in place with partly sunny skies and much warmer temperatures in the 70's. Clouds will increase during the afternoon as another strong shortwave takes aim at the northeast Saturday night & Sunday. Cloudy skies during the day with highs in the mid -upper 60's. Strong shortwave digging southeast from Canada Saturday night will close off over New England on Sunday setting up another stretch of cool rainy weather Sunday and Monday. Sunday looking like a washout with low clouds...showers and areas of drizzle along with a refreshing wind off the water as low pressure crosses the area. Showers will linger into Sunday night as low pressure continues east into the maritimes.
The low will sit off the coast Monday, locking in the clouds along with periodic showers and cool temps in the lwr-mid 60's. The low could still remain parked off the coast right into Tuesday with more clouds and periodic showers. Some of our models are not quite as pessimistic, and have some brightening, breaking sun Monday afternoon into Tuesday. I am not quite ready to go there yet. This is a persistent trough which will dominate our weather here in the Northeast right through June 16th. Warming up will be difficult to do under this upper level circulation. We will have to wait until at least June 16th for the pattern to change and shift an allow more warmth to shift farther into the Northeast.