Oct 19, 2016 12:03 AM

NH1 First Alert Weather: Soak Up the Mild Air, Cooler Air to Return

NH1 Chief Meteorologist

What a difference a day makes! After being stuck in the clouds, cool onshore winds with 50's all of Tuesday, A warmer west wind will blow this Wednesday. A cold front is pushing through early this morning. A few clouds may linger in the morning hours across southern New Hampshire, but any clouds will be clearing and giving way to to increasing sunshine. West winds combined with warm air loft will allow the downslope flow to warm the area quite nicely for Oct 19, with highs in the 70s outside the mountains, and in the mid to upper 60s in the hills. We could see a run to near 80 in the Merrimack valley. Any morning clouds in the mountains will dissipate by midday with mainly sunny skies everywhere. Should be enough flow persisting into the night to prevent full cooling, so lows will still be above normal, in the upper 30s N to mid to upper 40s in the south, but definitely cooler than previous nights.

High pressure moving into the Canadian Maritimes and low pressure developing over the Ohio Valley will begin an onshore easterly flow over much of New England on Thursday while high level cloud cover moves in from the southwest. Thursday will start off with some sunshine, but it will fade to increasing clouds with highs in the 50's and Lwr 60's. A deep upper level trough will begin to dig in from the Great Lakes and steer in increasing cloud cover and the risk for showers later in the day especially in the north and west. A warm front tries to lift north across the area Thursday night into Friday, though the flow will still be onshore for most of the region, holding temperatures in the 50's & 60s with abundant cloud cover. By this time, the onshore flow could even lead to areas of drizzle developing near the coast while the more persistent rain lifts north into Canada

We will have to watch for a surface low tracking through northern New England before merging forces with a weak tropical low racing northward off the East coast. On Friday, low pressure moving into northern New England from the west joins forces with low pressure moving north off the East coast, spreading rain through the region. With the tropical connection here, it is possible that some of the rain could be heavy though flooding is unlikely. The resulting low will then pull northward into the Canadian maritimes as a deepening low. It will take the showers along with it this weekend. We could see some lingering showers mainly in the mountains, which may eventually transition to snow showers as the cold continues to pour in Saturday evening. Cooler gusty NW winds along with a sharp upper level trough firmly in place across the Northeast through the weekend and into next week will direct and reinforce cooler than normal air into the region. By next Monday, highs will only be in the 40's/ Nighttime lows will be in the 20s and Lwr 30s...so frosty mornings can be expected....but the wind may play a factor any widespread frosts.

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