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John Homenuk

NYC Area Forecast: Freeze watches issued as coldest air of season arrives

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The coldest air of the Autumn so far is set to arrive in the Northeast US later tonight through Thursday, as a piece of the polar vortex swings through New England. The anomalously cold airmass will only deliver a parting shot, but it will be sufficient to temporarily usher in the coldest air of the season to date. Temperatures will fall into the 20’s and 30’s throughout the Northeast states, with wind chill values in the 20’s even in the NYC Area.

The National Weather Service has issued Freeze Watches and Freeze Warnings for parts of the interior that have not yet received a hard freeze or ended their 2018 growing season. Blustery winds are expected to preclude or inhibit the formation of frost, but wind chill values in the 20’s will create harsh conditions for any remaining vegetation.

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John Homenuk

PM Update: Freeze Warning in effect for many areas tonight

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On the heels of a strong cold front which moved through the area yesterday, cold air both aloft and at the surface has settled into the region today. This air is unseasonably cold, in fact, with mid level temperatures several degrees below normal and surface temperatures only topping out in the lower 50’s this afternoon in many locations throughout the area. The cold air aloft even aided in some snow and graupel showers throughout the area during the afternoon today.

Nevertheless, tonight will be a cold one. Forecast models are in good agreement on mid level temperatures falling to even colder levels tonight than they did today. At the 850mb level, for example, models suggest temperatures will fall to near -10 C later tonight. That is a value much more common in the middle of winter, and not often seen in late April.

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