This picture is how I envision some of your reactions to the snowflakes in the forecast :)
The system of interesting is located over Canada...where very few weather balloon launches take place. So the data is limited---but not absent for the models. The energy will dive toward West Viirgina Friday night...then transfer energy to a coastal low that will become a Nor'easter for Maine and far eastern Canada over the weekend. We will be on the edge of this whole process.
The video covers the latest models and yes....a look at accumulation maps.
Halloween history can be found below.
Snow: We have actually recorded a TRACE of snow ON Halloween 3 times in our recorded history.
1930 1954 1993
The 1993 trace of snow followed a clipper that produced 1-3" of snow the day before on the 30th. Most of that melted on Halloween Day in the city but many areas still had some snow still on the ground---but it remained cold certainly with wind chills in the 20s Halloween evening.
Cold: Coldest nighttime temperature: 26° way back in 1887.
Coldest afternoon temperature: 40° way back in 1874.
Warm: Warmest afternoon: 84° back in 1950. (notice I didn't say "way back" for those of you alive then)
Wettest: 1.68" back in 1941.
I also looked up the Halloween weather since the year 2000:
2013--- 70° Windy. We had a severe thunderstorm risk that day. Most of the storms arrived that night. Here was the SPC outlook Halloween evening and the eventual storm reports that took place:
2012--- Cool but dry. High 54°. In the 40s during Trick-or-Treat
2011-- 64° Windy evening. Big snowstorm impacting areas to our east through New York.
2010-- 67° Fairly Pleasant.
2009-- 54° Dry. Cool evening.
2008-- 71° Dry. Warm evening.
2007-- 73° Dry. Warm evening.
2006--- 65° Drizzle toward evening.
2005-- 72° Dry. Warm evening.
2004--- 66° Dry. Warm evening.
2003-- 78°. Dry. Very Warm evening.
2002-- 48° . Dry. Cool evening.
2001-- 72°. Dry. Warm evening.
2000--- 73° Dry. Warm evening.
So is this cool/wintry system a sign of a cold winter coming our way? No. One system cannot determine that.
November is looking very active as the subtropical jet looks to highly influence the lower 48. This means several low pressures---some strong. Patterns like that lead to warm weather...thunderstorms...with 1-2 day cold snaps behind the fronts. Then back to warm again. In other words---it looks busy for us.