Get ready for a very wet weekend across B.C.'s South Coast, as we tap into subtropical moisture, says CBC meteorologist Johanna Wagstaffe.

After a generally dry Friday for Vancouver, the heavy rain will start after midnight as a Pacific storm helps direct the hose of an atmospheric river right into Vancouver Island.

Rainfall warnings are already in place for western Vancouver Island for 100 to 120 millimetres, and in Howe Sound for 50 to 70 millimetres through Saturday. There is a special weather statement for the rest of the South Coast for close to 50 millimetres for Vancouver through to Saturday night.

Heavy rain will continue for Vancouver through Saturday before tapering off Sunday afternoon. High snow levels and locally windy conditions will also accompany the heavy rain, and avalanche danger remains high for much of the province.

By Sunday afternoon the plume of moisture will sink south, and we may even get to end the soggy weekend off with some late Sunday sunshine (which of course will be out an hour longer, thanks to daylight saving time).

Watch Johanna's video outlook in the player above, and catch her full forecast on CBC News Vancouver at 5 and 6.

Calm before Pineapple Express brings subtropical rain