For NYC, this is what the NAM 3k showed. Even if the amounts aren't correct, it should give an idea for tracking progress. The bulk of the snow is between midnight tonight and 7 PM Monday. The snow falling after that is light.
Sun 7pm: .4"
Sun 10pm: 2.0"
Mon 1am: 3.8"
Mon 4am: 5.4"
Mon 7am: 7.1"
Mon 10am: 9.7"
Mon 1pm: 14.5"
Mon 4pm: 17"
Mon 7pm: 18.6"
Mon 10pm: 19.6"
Tue 1am: 20.2"
Tue 4am: 20.7"
Tue 7am: 20.9"
Tue 10am: 21.2"