NH1 Weather Insider For Thursday July 23, 2015
Our weather may appear to be a bit repetitive, because it is! But the devil is in the details! Thursday will be fine day over all. Comfortable air, low humidity, temperatures in the 70's to near 80 by the afternoon. But just like Wednesday, abundant morning sunshine will give way to building afternoon clouds with the risk of a spotty afternoon shower. The reason for this is an upper low which lies across the border in Canada with a deep trough in place across the Northeast. The upper low is supplying cooler air aloft and instability. With the daytime heating, the warmer air rises into the cooler air, cools and condenses forming clouds and garden variety widely scattered showers during the afternoon hours. As the sun gets lower in the sky, the clouds break, the showers diminish and then we do it all over again!
The upper low will control our weather through the end of the week. In fact, a backdoor front will push through Maine and into New Hampshire Friday. NW winds aloft will flow over a developing NE wind at the surface. Surface convergence could develop along this front which could trigger scattered afternoon showers and thunderstorms. Because of the cooler air aloft, any storms will likely come with hail and the potential for some heavier downpours. It looks like New Hampshire has a good chance at least of seeing a few storms. This front will wash out over us Friday night . Saturday morning could start off with some clouds, along with a cool onshore wind from the east which will keep the beaches in the Lwr 70's, with warmer temperatures inland. Weak high pressure will be in place so skies should remain partly sunny for most of the day.
A warm front slides towards New England Saturday night and Sunday Morning. There could be a few showers along with this front Sunday morning along with mostly cloudy skies. A cold front will push will take until Sunday night to push through, but will likely be a trigger for more scattered showers or thunderstorms during the afternoon. Another weak front will arrive Monday which will likely trigger another round of PM Thunderstorms, then we should be off to the races with warming temperatures into the 80's next week. Still the risk of periodic showers and thunderstorms will persist on and off through the week. Very typical summer weather.