He urged Bostonians to take public transportation if possible, despite the slow start to the storm.
Locally heavy snow is expected as Winter Storm Orson is expected to undergo bombogenesis.
Sunshine graced the region Friday, following blizzard conditions that dropped a foot and a half of snow in New England and eastern NY.
A swath of snow will skirt along the leading edge of mild air across the Northeast through Saturday.
Heavy and blowing snow is expected Sunday night and Monday, with west winds increasing to 15 to 25 miles per hour Sunday night with gusts up to 35 miles per hour producing poor driving conditions, and potentially deep, snow-covered roads.
The Cape and Islands received just an inch of new snow, while north of Boston saw about 2.5 inches. The storm will taper off this afternoon, but if temperatures stay cold as expected, road conditions could remain slick through the evening.
Nearly 6,000 MA snow crews were out preparing for the storm, but it was hard to keep up and there is still considerable snow on the roads. There will be many impacts on Southern New England with this complex and powerful storm system.
A bigger, more widespread storm could bring more than that Saturday night into Monday morning, especially in Central New York.
The storm was expected to pack a punch, but it's not a nor'easter.
This storm will wind down Monday morning as it pulls into the Gulf of Maine. But heavy wind gusts will still result in widespread snowdrifts and some whiteout conditions.
Airlines cancelled more than 3,000 flights, winter storm warnings stretched from ME to New Jersey and salt trucks deployed across the region on Thursday as the season's most risky snow event rolled into the Northeast.
There's the potential for unsafe road conditions for the commute on Monday, as well as airline delays and cancellations. Snow, possibly mixing with sleet as after north as the I-84 corridor to all snow far northern CT throughout the afternoon and evening. Downwind of lakes Erie and Ontario, snowfall can be enhanced on the back edge of the storm.
NY and Philadelphia schools will reopen on Friday, officials said.
In New York City, the whiplash-like change in the weather between Wednesday and Thursday had snow teams preparing during record-high temperatures.