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Oct 13, 2015 12:05 AM

NH1 Weather Insider with Joe Joyce: October 13, 2015

NH1 Chief Meteorologist

As we know, all good things must come to an end. This late summer warmth is eventually going to go bye-bye. Still even on this Tuesday, we will still have some mild air to enjoy. Clouds are converging upon us today with clouds tracking up the coast during the morning. These clouds will give us a passing threat of a shower or two during the morning-midday. Winds will be shifting to the SW, so any breaks of sun during the afternoon would spike temps back into the Lwr 70's in southern NH. A cold front will sweep through at the end of the day, and may trigger another brief passing shower sometime around 5-7 PM.

Westerly breezes behind the front will make for a fairly pleasant Wednesday with partly sunny skies and highs a bit cooler in the mid 60's. Clouds will build in the afternoon along another approaching cold front which may trigger another passing isolated shower. Breezy NW winds will usher in cooler air into New Hampshire for Thursday with mostly sunny skies and highs in the 50's near 60. More clouds may be in the mountains.

It will be a series of fronts which will be sliding through the Northeast that will continue to break down the milder air and direct cooler air into the Northeast this weekend. So it will not be surprise when another cold front arrives on Friday with more clouds and an even better chances at showers pushing through. Behind this cold front, breezy NW winds will direct the coldest air so far this season as highs will be in the Lwr-mid 50's Saturday, with wind chills feeling in the 40's. Another story will be the colder air aloft. Above 1500 feet, it will be cold enough for snow. Any available moisture or lift in the atmosphere will be able to trigger snow showers in the mountains in Northern VT and NH, especially Saturday and Saturday night. No accumulations are expected.

A deep upper level trough will be right over us this weekend keeping the cold right over us. The combination of a departing low from Friday, along with building high pressure to our south and west, will make for a funneling of air from Canada right inot New Hampshire. Saturday night will be a widespread frost and freeze with most locations falling below 32 for several hours marking the official end to any growing season that was left. This will be a killing frost no doubt. Sunday morning at dawn will have a winter-like feel. Temps will rebound with plenty of sunshine, but not by much. Highs will remain in the 40's on Sunday with wind chills feeling in the 30's! Temperatures will quickly moderate to more normal levels by next week...starting October 20th, once high pressure shifts off the coast and SW winds return.


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