The well advertised cooler (read seasonal) air is moving in Tuesday night.  That much has been certain for quite some time now.  What has remained more elusive is the answer to the question “will the colder air come with snow”?  While there’s still no clear cut answer to that question, the long range weather maps started hinting at something today that I’d like to share. The image above shows jet stream level vorticity for this Saturday.  Vorticity is a measure […]