Officials in Nova Scotia are warning drivers to be careful about flash freezing as rapidly dropping temperatures turn Thursday morning's rain into sheets of ice.

"We're asking people to please, just take extra time to get where you're going, reduce your speed and use extra caution when on the roads," said Pam Menchenton, a spokeswoman for the provincial Department of Transportation and Infrastructure Renewal.

"Even though a road that was wet an hour ago may freeze suddenly and so a wet road may actually now be a slippery road."

Menchenton said provincial crews were salting the roads but the drop in temperature meant the roads were freezing as soon as the salt was put down.

Crews are now putting sand on the roads to provide traction but it's taking "longer than usual" because of the difficult conditions, she said.

Nova Scotians woke up to a racket of heavy rain and wind Thursday morning that threatens to freeze over.

Between 30 to 50 millimetres of rain was expected in the Halifax area with blowing snow, ice pellets and freezing rain in northern parts of the province.

Flooding Dartmouth General

The CBC's Craig Paisley wades through the water where a street is blocked off due to flooding by the Dartmouth General Hospital. (CBC)

More than 2,000 Nova Scotia Power customers were in the dark in Dartmouth on Thursday morning, but power was restored by 8 a.m. AT. Hundreds in Amherst also got their power back later on Thursday.

A section of Pleasant Street was closed near the Dartmouth General Hospital due to flooding.

Marine Atlantic decided to keep its vessels in port in both North Sydney and Port Aux Basques, N.L.

CBC meteorologist Peter Coade said the rain will gradually clear overnight taking its mix of snow, ice pellets, rain and freezing rain to Newfoundland.

The work week will end on a sunny note, but another disturbance threatens the weekend with flurries and rain.