Toronto airports: messy weather advisory from 14:00 – 23:59 today

Advisories from Porter and AC
Airports: YYZ, YTZ
Toronto, Billy Bishop Toronto City Airport, and Pearson
Event:
Flights may be impacted by forecasted snow and subsequent deicing and Air Traffic Control restrictions.

Air Canada and Air Canada Express advise that flights to, from or connecting through the airport(s) listed may be delayed or cancelled due to the event described.
When:
14:00 to 23:59, March 18, 2013

Air Canada has revised its ticketing policy for customers booked on affected flights to facilitate changes to bookings. Those customers wishing to make alternate travel arrangements can do so without penalty, space permitting, using our online rebooking tool: check your alternate travel options currently available; re-book yourself and check in before arriving at the airport.
http://www.aircanada.com/en/travelinfo/before/operation/index.html