Mass. Nor'easter: Hour-by-Hour Timeline of This Week's Big Winter Storm

This week's nor'easter is expected to be spread across three days, having started on Monday and continuing through Wednesday morning.

It's also expected to bring a wide range of potentially devastating impacts, including over 20 inches of snowfall, high winds that could cause widespread power outages, coastal flooding and potentially even blizzard conditions in some areas.

Here's a detailed look at the timing and potential impacts of this week's big winter storm:

When is it going to snow, and how long will the winter storm last?

Power outages likely, 70+ mph wind gusts possible

Coastal flooding, wave heights

How much is it going to snow in New England?

Snow map for Massachusetts

Northern New England snowfall totals

Southern New England snowfall totals