Jun 1, 2016 1:47 AM
NH1 Weather Insider with Joe Joyce: June 1, 2016
NH1 Chief Meteorologist
Fair weather is expected on Wednesday with high pressure in control. It should warm up pretty good during the morning and early afternoon hours with a good amount of sun. During the afternoon surface high pressure will build southwestward through the gulf of Maine and bring a backdoor front inland during the afternoon hours. This front will come with an increase of afternoon clouds. Highs will climb into the 70's inland, even near 80 in the western valleys. Cool ENE winds will keep it much cooler at the coast in the 60's to near 70. High pressure off the coast wrapping in the cooler onshore flow will result in rapid cooling on the coastal plain late in the afternoon and early evening. The low level cool air mass will spread inland overnight Wednesday night. The air mass should also moisten as the night wears on resulting in the development of low clouds and perhaps some fog and drizzle, especially at the coast overnight.
Overall, I am expecting temperatures to be near or below normal right through the middle of next week. Where did those 80's go? High temperatures in the 60's and 70's will be more likely over this time period with dewpoints in the 40s and 50s should keep many air conditioners from appearing in windows for at least one more week. Thursday will be one of the cooler days of the stretch. A cooler marine airmass will lie in place across New Hampshire with light ESE winds. Highs will be in the 60's inland, and cool raw 50's at the coast with cloudy to partly cloudy skies. Clouds will move back in Thursday night with an approaching warm front which could trigger a few pre dawn showers Friday. A warmer wind from the SSW will develop with highs back into the Lwr-mid 70's. A cold front will push through by the end of the day with more clouds and this will likely trigger a few more scattered showers. As is typical with many fronts in New England, it will be warmer behind the front as winds go offshore and downsloping northwest winds on Saturday bring temperatures into the 70s... possibly nearing the Lwr 80s in spots.
Saturday will be the pick of the weekend with weak high pressure and a light mild land breeze. A Cool onshore southeast flow returns on Sunday as high pressure shifts further east and a front moves east through the eastern Great Lakes. This will keep temperatures cool especially near the coast. To the north and west, temperatures may reach the mid 70s, but coastal locations will be lucky to reach the low 60s.
An upper level low moving through the Great Lakes will begin to generate an onshore easterly flow again over the region on Sunday, with rain arriving Sunday evening into Monday. Models still differ a bit on the timing of the rain, they are coming together on the timing, helping to narrow down the timing of heaviest rainfall to Sunday evening through Monday. It will take a few days for the upper low to fully exit the area so there could be some showers lingering through Tuesday with temperatures remaining a little cooler than normal for early June. In fact, temps could average below normal right through the middle of the month with only a few short-lived spurts of summer warmth thanks to a very persistent trough in place across the Northeast.