Jun 27, 2016 11:41 PM

NH1 First Alert Weather: Scattered Showers/T'Storms Ahead

NH1 Chief Meteorologist

More clouds in the forecast for Tuesday with the risk of a few scattered pop up showers in the afternoon. A more humid day with highs in the 70's and a few lower 80's. A short wave will be digging into the Northeast from the Great Lakes. This will direct a cold front towards New England. It appears that thunderstorms will initiate during the afternoon over...and possibly assisted by elevated heat source of...the higher terrain. Vermont and Northern New Hampshire will likely be first to see thunderstorms develop later in the day. Wind fields are generally from the SW and parallel to the boundary...so despite modest amount of moisture in the air, training echoes may lead to some locally heavy rainfall and maybe isolated flooding. The atmosphere will be favoring loosely organized clusters of storms with occasional bowing structures. This will mean these storms which develop Tuesday night will have the potential to become severe and be accompanied with some gusty winds as they move through late Tuesday night and early Wednesday morning.

Showers and isolated thunderstorms continue through Tuesday night, however they should weaken with time. Patchy fog may redevelop during the overnight hours. Storm total rainfall appears to around a half inch near the coast and upto an inch in the far north. This will not put much of a dent in the drought which is moderate over the mountains and portions of southern NH and NE MA.

The slow moving cold front and associated trough aloft will continue to cross the region Wednesday. Models indicate quite a bit of instability developing Wednesday afternoon across the area enhanced by daytime heating. Greatest threat of strong storms will be across New Hampshire. Showers and thunderstorms should come to an end Wednesday evening as the trough swings east.

Drier and more stable air moves into the region for Thursday and Friday with a weak disturbance moving through the region Friday night into Saturday as another upper level trough swings east. This will bring scattered showers to the region overnight Friday night into early Saturday.

An upper level trough will remain over the region through Monday. With cool air aloft and strong sunshine, expect clouds to build and increase each afternoon...generally sunny to partly sunny skies with highs in the Lwr-mid 80's. 70's at the coast. More clouds will be possible especially in the mountains where an afternoon shower is possible Saturday through Monday. Breezy winds from the NW are likely for July 4th with low humidity with highs near 83-85 degrees.


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