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Toronto and much of the Greater Toronto Area are getting hit with another winter storm today, as Environment Canada warns up to 40 centimetres of snow could fall before the system moves out tonight.

The storm arrives just over a week after the region’s last severe snowfall, which shut down schools, closed highways and triggered hundreds of collisions.

Environment Canada’s rare orange winter storm warning is an alert the agency reserves for severe weather that is likely to cause significant damage or health impacts as travel could quickly deteriorate.

CP24 will have live, continuous coverage as the storm moves across the GTA, including real-time traffic conditions, transit impacts and updated snowfall totals.

HERE IS THE LATEST:

Snowfall amounts of 20 to 40 cmPeak snowfall rates of 5 to 7 cm per hour.Wind gusts of up to 50 km/h.

FULL FORECAST: For a look at the hour-by-hour forecast, including snowfall totals, click here

Follow along here for live updates.

10:30 a.m. – Mississauga services impacted

The City of Mississauga says all libraries are closed today, and community centres and arenas will close at 12 p.m.

City Hall and city office buildings are also closed, and all programs and rentals have been cancelled.

The Paramount Fine Foods Centre will remain open for the Scotties Tournament of Hearts.

Transit riders are warned that MiWay buses may experience delays or cancellations due to the storm.

Outdoor rinks will remain closed until conditions are safe to reopen.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

10:20 a.m. – Ramp closure on Highway 407

The OPP says the eastbound transfer ramp from Highway 407 to Highway 404 in Markham is fully closed due to a “jackknifed tractor-trailer.”

Drivers are being advised to “plan alternate routes” as crews work to clear the ramp

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

10:10 a.m. – Highway 401 westbound lane blocked

The OPP says three center lanes of Highway 401 westbound at Weston Road in North York are currently blocked also due to a “jackknifed tractor-trailer.”

Motorists are bypassing the incident using the far right and far left lanes.

Officers are urging drivers to slow down and exercise caution when approaching the area as crews work to clear the blockage.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

10:00 a.m. – Vaughan winter operations update

Vaughan city officials say that community centres and libraries are open today despite the hazardous weather.

City crews say salting operations are underway city-wide to keep roads and walkways passable as the storm continues.

Officials advise residents to exercise caution and check updates before heading out.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

9:50 a.m. – Hamilton city facilities closing early

Hamilton says all city facilities, including arenas, community centres, and the Gage Park Greenhouse, will close at noon today due to the storm.

All museums in the city are also closed.

The emergency Warming Centre at Bennetto Community Centre will remain open for residents in need of shelter from the cold.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

9:40 a.m. – Toronto Zoo closed

The Toronto Zoo says it will be closed today due to the severe winter storm.

Officials say the closure is a precaution for the safety and wellbeing of animals, staff, volunteers, and visitors.

The zoo encourages the public to follow its social media channels for updates on operations and reopening.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

9:30 a.m. – 48 TTC stops out of service

The TTC says storm conditions have forced 48 transit stops across the city out of service as snow and ice continue to build up.

For more real-time TTC service impacts check here.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

9:20 a.m. – 5 to 7 cm of snow per hour

Environment Canada is now warning that snowfall rates could intensify dramatically as the core of the storm moves into the region.

Forecasters say parts of Toronto and the GTA could now see snow falling at rates of 5 to 7 centimetres per hour, a pace that can quickly overwhelm road crews and make travel extremely dangerous.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

9 a.m. – Warming centres open

In response to the storm, the City of Toronto is reminding residents that warming centres are open for those who need it.

Warming centres are currently operating at:

81 Elizabeth St.885 Scarborough Golf Club Rd.136 Spadina Rd.349 George St. 12 Holmes Ave.

The city has also opened surge warming sites, which activate when temperatures hit specific thresholds. The first surge site is open at Jimmie Simpson Recreation Centre at 870 Queen St. E., while a second surge site is operating at Cecil Community Centre at 58 Cecil St.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

8:50 a.m. – Toronto recreation programs cancelled

In an update posted to social media, the City of Toronto says all recreation programs at school locations are cancelled today due to weather conditions.

The city added, “programs at city pools will be available on Sunday morning. We will continue to monitor and adjust services, as required.”

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

8:40 a.m. – TTC service disrupted

The TTC says several routes are already being impacted by deteriorating weather conditions across the city.

On the 54 Lawrence East route, there is no service between Rouge Hill GO Station Loop at Lawrence Avenue East and Starspray Loop at Lawrence Avenue East due to weather conditions.

Meanwhile, the 42 Cummer bus is detouring via Leslie Street, Finch Avenue East and Bayview Avenue as crews deal with storm-related impacts.

For more real-time TTC service impacts check here.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

8:35 a.m. – UP Express reduces service frequency

The UP Express says trains will run every 30 minutes instead of every 15 minutes as a result of the winter storm.

The reduced service schedule will be in effect today and tomorrow, as crews deal with weather-related impacts across the network.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

8:30 a.m. – All Toronto libraires closed

Toronto Public Library says it is shutting down all branches for the day as weather conditions continue to deteriorate across the city.

“Due to deteriorating weather conditions, all library branches will be closed today,” the library said in a statement posted to social media.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

8 a.m. – Toronto’s salt trucks already deployed

City tracking data shows many salt trucks particularly in Scarborough were deployed overnight, with a majority of major streets in those areas already treated within the past four hours.

On the city’s live plowing and salting map, green lines indicate roads treated less than four hours ago, yellow lines show roads treated four to eight hours ago, and red lines mark streets that were last serviced eight to 12 hours ago.

Salt map toronto

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

7:30 a.m. – When will things pick up?

The worst of the storm is still ahead for Toronto and the GTA, according to Environment Canada’s hourly forecast.

Forecasters say heavy periods of snow are expected to begin around 10 a.m., with a 100 per cent likelihood of precipitation once the main system moves in.

As conditions deteriorate, wind chills will make it feel closer to –20 C, with winds gusting up to 50 km/h, raising the risk of blowing snow and rapidly worsening visibility across the region.

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

7 a.m. – Flights cancelled at Pearson Airport

Flight disruptions are rapidly mounting at Toronto Pearson International Airport as the winter storm moves into the region.

As of 7 a.m., only 40 per cent of departing flights are operating on time, while 3 per cent are delayed and 57 per cent are cancelled, according to airport data.

Arrivals are being hit even harder. Just 32 per cent of incoming flights are landing on schedule, while 8 per cent are delayed and 60 per cent have been cancelled.

flights at pearson

–Jermaine Wilson, Multi-Platform Writer for CTV News Toronto & CP24

6 a.m. – Orange storm warning over Toronto

Environment Canada says the storm is expected to bring 20 to 40 centimetres of snow, with locally higher amounts possible in some parts of the GTA.

Experts say winds could gust up to 50 km/h, further reducing visibility as a band of lake-effect snow from Lake Ontario will move across the region.

“Widespread snow associated with an approaching system will develop later this morning,” official said. “As this occurs… locations affected by lake enhancement will receive the highest snowfall amounts.”

Environment Canada warns visibility could be “suddenly reduced to near zero” at times in blowing snow, making travel hazardous or, in some cases, impossible.

This is a developing news story, more details to come…