Are you ready for the weekend? Expect to shovel — a lot.

There is a serious snowstorm headed for the St. John's area Friday, with Environment Canada estimating that snowfall may exceed 30 centimetres between Friday and Saturday nights.

Environment Canada issued a blizzard warning at about 4 p.m. NT, warning of strong winds and near-zero visibility in snow and blowing snow.

Blizzard warnings are in effect for St. John's and the Avalon, and winter storm warnings have been issued for the Bonavista and Clarenville regions.

Blizzard warnings and winter storm watches issued by Environment Canada on Jan. 19

Environment Canada has issued winter storm watches and blizzard warnings for the eastern part of Newfoundland. (Courtesy Environment Canada)

"Right now we're thinking between 20 and 30, possibly more — some guidance is showing that it could be more than 30 [centimetres]," Environment Canada meteorologist Spencer Clements said Thursday morning.

"So you should be prepared for significant amounts and especially for the reduced visibility and blowing snow for most of the weekend," Clements told CBC's St. John's Morning Show.

Heavy snow and blowing snow on the Avalon Peninsula is expected to arrive late Friday afternoon and continue through the night while spreading west, accompanied by strong winds with gusts reaching 80 km/hr or higher.

By Saturday, winds are expected to strengthen to 100 km/hr.

"Travel is expected to become extremely hazardous due to the heavy snowfall and poor visibility. The strong winds may lead to power outages," Environment Canada wrote.

Snow expected to taper to flurries Saturday evening or overnight, and could persist through the day Sunday.

Winds are expected to gradually decrease Saturday night through early Sunday.

With files from the St. John's Morning Show