Delays are expected at Toronto Pearson International (CYYZ) today. All times on this page are displayed in local time for Toronto Pearson International .
| Risk | Beginning | Ending | Details |
| Medium | 6:00 AM on 4/9 | 9:00 AM on 4/9 | More information |
| Medium | 1:00 PM on 4/9 | 5:00 PM on 4/9 | More information |
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Medium Probability of Delays Between 6:00 AM on 4/9 AND 9:00 AM on 4/9
During this time period the airport expects to experience mist which will cause a medium likelihood that flights will experience delays.
Here is a look at what the forecast conditions are and what is required for normal operation:
| Normal | Forecast | |
| Conditions | None | Mist, rain |
| Visibility | Greater than 2 | 10 |
| Wind | Less than 11.8 MPH | 14.1 MPH gusting to 25.9 MPH |
| Clouds | Higher than 1,000 | Overcast at 5,000 |
Medium Probability of Delays Between 1:00 PM on 4/9 AND 5:00 PM on 4/9
During this time period the airport expects to experience thunderstorms and mist which will cause a medium likelihood that flights will experience delays.
Thunderstorms are potentially deadly for aircraft, mainly because of the unpredictable and severe winds that are associated with these storms. That wind causes a significant risk to landing aircraft and so airports will typically close during thunderstorms.
Lightning can also cause a hazard to ground staff, so airports may decide to stop servicing aircraft on the ground during these storms and for a period of time after they have passed.
Here is a look at what the forecast conditions are and what is required for normal operation:
| Normal | Forecast | |
| Conditions | None | Mist, thunderstorms, rain |
| Visibility | Greater than 2 | 10 |
| Wind | Less than 11.8 MPH | 17.6 MPH gusting to 29.4 MPH |
| Clouds | Higher than 1,000 | Overcast at 3,000 |