Maximum Snowfall: Lk. Ontario: 12" (Ontario); Lk. Erie: 6" (Perrysburg)

Duration: 18 Hours +/-

Prime Feature: Frigid northwest flow with multiple bands and convergence.

Lake Flake Scale: ** 2 Flakes

The constant flow of arctic air continued to produce lake snows as we closed out the third week of the month. A short wave dropped southeast in the flow...and intensified the activity Monday evening (20^th). The flow was west northwest at first...with the multiple bands focusing more into a single band along the south shore of Lake Ontario from Orleans county east across northern Monroe and Wayne counties. The typical convergence band set up with northerly flow along the lakeshore and westerly flow just a few miles inland. The heaviest snow fell early Tuesday morning in the Webster-Ontario area. This caused considerable problems in the morning commute for portions of the Rochester metro area. Locally heavy snow fell also across Orleans county. The activity broke up by midday Tuesday as a mesolow set up near Rochester, disrupting the activity. Just narrow multiple banded snow showers continued later Tuesday and into Tuesday night.

Off Lake Erie...persistent WNW flow kept multiple bands across northeast Chautauqua and northern Cattaraugus counties. Accumulations were generally 2 to 6 inches over the period. This too, weakened Tuesday night.

Here are some representative amounts ....