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Will KNYC hit the 40s 9/16 or 9/17


BrooklynSnow

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So I love the first feel of crisp fall temperature. And to my delight NWS is showing a potential low temp of around 50 this Friday and Saturday. What is the chance of KNYC really bottoming out at or below 50 this week?

Thursday Night: A slight chance of showers before midnight. Partly cloudy, with a low around 50. Chance of precipitation is 20%.

Friday Night: Mostly clear, with a low around 50.

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I'll guess No...The heat island effect is to strong...

the earliest and latest date the temperature dipped into the 40's...

earliest..........................................................

9/4/1872

9/4/1883

9/6/1888

9/6/1924

9/6/1963

latest date............................................................

10/20/2005

10/16/1955

10/16/1995

10/15/1898

10/15/1969

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Here are 3 setups in the last 30 years that produced record lows at NYC in September

The 1986 and 1990 setups had a colder airmass. 850 temps were near 0C ove NYC. 1993 was closer with 850s of 3-5C. I think 47 or so is possible. Not sure if Friday AM will be the colder morning. The GFS says so with a low of 48 but the gradient will be weaker Sat AM.

9/17/86 - 45

http://www.meteo.psu.edu/~gadomski/NARR/1986/us0917.php

9/18/90 - 44

http://www.meteo.psu.edu/~gadomski/NARR/1990/us0918.php

9/20/93 - 44

http://www.meteo.psu.edu/~gadomski/NARR/1993/us0920.php

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It may particular away from the coast and urban areas. Just seems like getting the cities to drop is like pulling teeth this time of year. I expect to see some quite large anomalies between the far NW burbs and EWR/NYC, Could be a situation where the cities hover around 60 late tomorrow night while its already in the 40s well north and west. But both the NAM and GFS show pretty large temperature drops in the neighborhood of 20 degrees or so between 18z and 0z tomorrow.

The airmass is already producing record lows in the upper Midwest. We'll see if that holds as it progresses east.

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