Ottawa and Gatineau received almost 25 centimetres of snow leading to an arduous morning commute and a winter wonderland in the capital.

The winter storm landed overnight and into Wednesday morning bringing with it the first significant snowfall of the season in eastern Ontario and western Quebec.

The storm is the result of a low-pressure system from the Gulf of Mexico.

Car slides into Gatineau River

A woman was rescued and taken to hospital after her vehicle slid into the Gatineau RIver. She suffered hypothermia, police said. (Geneviève Garon/Radio-Canada)

Driving conditions deteriorated after snow began around 7 p.m. ET Tuesday.

Motorists should be prepared for hazardous winter driving conditions due to very low visibility in snow and local blowing snow and rapidly accumulating snow on untreated roads. Travel plans should be adjusted accordingly.

CBC Ottawa climatologist Ian Black also said people should shovel Wednesday as the wet snow would freeze overnight.

Snow causes serious Quebec crashes

Ottawa police reported 29 crashes between 5:30 a.m. and 9 a.m., but no major incidents. In western Quebec, an armoured truck overturned early Wednesday morning, sending one to hospital and injuring two others, and a car slid into the Gatineau River at about 7:18 a.m., sending a woman to hospital with hypothermia.

She has since been released from hospital.

Tree down on Gladstone Avenue

The heavy snowfall early Wednesday knocked a tree down on hydro wires along Gladstone Avenue near Bayswater Avenue. (Stu Mills/CBC)

A tree also fell on Gladstone Avenue near Bayswater Avenue forcing a road closure and the re-routing of the Route 14 bus.

All school buses in eastern Ontario boards were cancelled, while only the Commission scolaire des Draveurs cancelled buses for those living north of Highway 50.

The MacDonald-Cartier International Airport had few cancellations and passengers should check their flight status before heading to the airport, a spokesperson said.

All driving tests in Ottawa were also cancelled due to the weather.