St Louis Lambert International Airport turbulence forecast
St. Louis, United States
STL (St. Louis, United States) sits at 38.75°N, 90.37°W, 618 ft elevation — inland.
About STL
Major airport serving St. Louis, United States.
- Climate
- Mid-latitude continental — strong seasonal cycle
What to expect on departures
Computed from STL's geography and climate
St. Louis 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. Warm-season convection (June–August) drives the dominant turbulence pattern from STL — afternoon thunderstorm cells are routed around but their wake turbulence and gust fronts can still affect arrivals and departures.
Climbout notes
Climbout is usually unremarkable — most turbulence on flights from St. Louis occurs at cruise rather than immediately after takeoff.
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.
- Peak turbulence
- November–February (strong jet)
- Typically calmest
- May–September
Departing from STL?
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STL turbulence FAQ
Is turbulence common on flights from STL?
St Louis Lambert International Airport is best described as a mid-latitude jet-exposed hub. St.
When is turbulence worst for St. Louis 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.
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
More on St. Louis turbulence
Background reading on the factors that shape your flight.
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