ST. JOHN'S, N.L. -- Residents in Newfoundland are being advised to prepare for the possibility of flooding and power outages today and Saturday.

Environment Canada has issued a rainfall warning for Newfoundland's north coast and the Avalon peninsula.

The province's emergency management agency says the rain could pass the 50-millimetre mark by Saturday morning.

Forecasters say the wet weather is the result of an air mass that moved over the region ahead of post-tropical storm Bertha.

The national weather agency has also issued a rainfall warning for the northern tip of New Brunswick.