Both the River Forecast Centre and Environment Canada have issued weather warnings for the Sea to Sky corridor overnight and into tomorrow, Oct. 22.
Heavy rainfall and high winds are the result of a Pacific frontal system moving through the area tonight (Oct.21) warned Environment Canada.
"Heavy downpours can cause flash floods and water pooling on roads," states the release.
The River Forecast Centre issued a high streamflow advisory for the corridor as well.
"A Pacific storm is headed towards British Columbia and Washington State," states the Centre's warning.
"The storm is expected to bring heavy rain across the South Coast. Significant rainfall is expected for the North Shore Mountains, Howe Sound, and the Sea-to-Sky Corridor from Squamish to Whistler areas Tuesday night and throughout Wednesday. "Rainfall amounts up to 100 mm or more are currently forecast for these areas over the next 24 to 36 hours."
The heavy rain will increase streamflows and some flooding is to be expected warned the centre.
"Streamflows on the Stawamus River, Coquitlam River at Port Coquitlam, Seymour River below Orchid River and Squamish River near Brackendale may reach 2-year to 5-year flow levels.
"Similar conditions are expected on smaller, ungauged watersheds including Capilano River, Lynn Creek and watersheds along the Howe Sound-Squamish corridor."
The storm system is also bringing heavy winds tonight with gusts up to 70 km/h expected near Howe Sound.
"Loose objects may be tossed by the wind and cause injury or damage," states the warning from Environment Canada.
Forecasters also say that some of the moisture and wind from tropical storm Ana may help fuel the storm off the coast of the Northwest with more storms expected throughout the week.
While the valley may be getting walloped with rain, the alpine is expected to get up to 50 centimetres of snow by the end of day Saturday.
Email reports of severe weather to firstname.lastname@example.org or tweet with the hashtag #BCStorm.