A storm system from the U.S. is expected to pound Atlantic Canada overnight.

Atlantic Canada will get hit by more rain and snow Monday as a storm system moves up the East Coast from the U.S.

Environment Canada is predicting a storm surge in P.E.I., strong winds on the Newfoundland coast, rain in Halifax and up to 60 centimetres of snow in the hardest-hit areas of New Brunswick.

Conditions will deteriorate as the storm moves over Nova Scotia to lie over the Gulf of St. Lawrence on Monday.

"Monday, expect travel chaos if you're planning on trying to get around through the Maritimes," as well as Newfoundland and Labrador, said CBC meteorologist Michelle Leslie.

P.E.I. could get up to 30 centimetres and the storm surge "will combine with large tides to give higher-than-normal water levels," Environment Canada said.

Storm surge warnings have been issued for areas along the Northumberland Strait from Malagash, N.S., north along the New Brunswick coastline to the Acadian Peninsula, and the north side of P.E.I., especially the western half.

Nova Scotia will get rain and snow Monday along the coast. The province could get 15 to 20 centimetres of snow and the storm could continue until Tuesday.

The combined rain and snow "will make things a bit messy," said Doug Mercer, a meteorologist for Environment Canada's Storm Prediction Centre in Dartmouth, N.S.

Ramona Jennex of the province's Emergency Management Office said "this could be our first real taste of winter this year."

New Brunswick is facing "a significant storm" with heavy snow in most areas and blizzard conditions in the northwest, the provincial Emergency Measures Organization said Sunday.

There will be near-zero visibility in some areas and snowfalls of 30 to 60 centimetres in the hardest-hit regions.

Flooding, rapidly rising water levels in streams and rivers, coastal erosion and power outages are all possible, the EMO said.

The storm caused havoc Sunday in the American South and forced hundreds of flight cancellations in the U.S. Northeast, Washington, D.C., Baltimore, Chicago and the Carolinas.

Wind gusts in Newfoundland's southwest will reach near 100 km/h on Monday morning and peak near 150 km/h in the afternoon, Environment Canada said.

Winds gusting to 100 km/h are also expected along much of the west and east coasts of Newfoundland.

Throughout December, the Atlantic region has been devastated by unusually heavy rainfall, strong winds and coastal storm surges.

Roads and bridges have suffered serious damage, homes were flooded, fishing gear destroyed and some wharves and boardwalks pounded to bits.

Officials have said the damage could total tens of millions of dollars.