Toronto Pearson International Airport turbulence forecast
Toronto, Canada
YYZ (Toronto, Canada) sits at 43.68°N, 79.63°W, 569 ft elevation — coastal with the Appalachians nearby.
About YYZ
Canada's largest airport and major North American hub.
- Climate
- Mid-latitude maritime — variable, wind-driven weather
- Nearby terrain
- Appalachians
- Geography
- Coastal — marine-influenced airmass
What to expect on departures
Computed from YYZ's geography and climate
Toronto sits squarely under the mid-latitude jet, north of which most long-haul corridors run. Clear-air turbulence (CAT) at cruise is the most common source of bumps on departures from here, especially during December–February when the jet is at its strongest. The Appalachians sit upwind of YYZ on prevailing flow days, generating mountain-wave turbulence that can extend several hundred kilometres downwind at cruise level. The lee-wave risk is highest when December–February winds at FL300 cross the Appalachians at near-perpendicular angles. Warm-season convection (June–August) drives the dominant turbulence pattern from YYZ — afternoon thunderstorm cells are routed around but their wake turbulence and gust fronts can still affect arrivals and departures. YYZ's coastal position means departures often transit from the cool marine boundary layer into warmer continental air within minutes of takeoff — a brief but reliable bumpy transition on warm-season afternoons when the sea breeze is set up.
Climbout notes
Standard Instrument Departures (SIDs) often route around terrain; on strong-wind days, low-level turbulence in the lee of the hills is common in the first few thousand feet.
Turbulence conditions
Transatlantic routes cross the jet stream. Great Lakes weather effects can cause turbulence. Winter polar vortex events increase clear air turbulence on northern routes.
Seasonal pattern
Winter (December–February) brings the strongest jet-stream activity — that's when long-haul departures most often log clear-air turbulence at cruise. Summer (June–August) is peak thunderstorm season — convective turbulence is the dominant warm-season risk. Mountain-wave activity near the Appalachians peaks in the cold season when upper-level winds blow hardest across the range.
- Peak turbulence
- November–February (strong jet)
- Typically calmest
- May–September
Departing from YYZ?
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Popular routes from YYZ
YYZ turbulence FAQ
Is turbulence common on flights from YYZ?
Toronto Pearson International Airport is best described as a jet-stream + mountain-wave corridor. Toronto sits squarely under the mid-latitude jet, north of which most long-haul corridors run.
When is turbulence worst for Toronto flights?
Winter (December–February) brings the strongest jet-stream activity — that's when long-haul departures most often log clear-air turbulence at cruise. Peak turbulence window: November–February (strong jet). Typically calmest: May–September.
Does the terrain around Toronto affect turbulence?
Yes — the Appalachians lie close enough to generate mountain-wave turbulence on days with strong upper-level winds. These waves can propagate hundreds of kilometres downwind, so they sometimes affect cruise even after you've left the immediate area.
How accurate are Turbcast forecasts?
We combine live NOAA Aviation Weather Center data (PIREPs, SIGMETs, AIRMETs) with physics-based Ellrod and Richardson-number calculations derived from Open-Meteo pressure-level wind and temperature data. If a source is unavailable for a waypoint we show an em dash rather than invent a number.
Articles
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