Shannon Airport turbulence forecast
Shannon, Ireland
SNN (Shannon, Ireland) sits at 52.70°N, 8.92°W, 46 ft elevation — coastal.
About SNN
Major airport serving Shannon, Ireland.
- Climate
- Subpolar — long winters, short cool summers
- Geography
- Coastal — marine-influenced airmass
What to expect on departures
Computed from SNN's geography and climate
The jet stream meanders across this latitude seasonally — SNN sees its strongest CAT exposure in December–February, when the polar jet pushes equatorward and routes intersect it more often. June-onwards departures climb into cleaner upper-level flow. SNN'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
Climbout typically transitions from cool marine air to warmer continental air — a brief bumpy layer near the boundary is normal on summer afternoons.
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.
- Peak turbulence
- November–February (strong jet)
- Typically calmest
- May–September
Departing from SNN?
Get a live turbulence forecast for any flight out of Shannon Airport — departure airport already filled in. Free, no signup.
SNN turbulence FAQ
Is turbulence common on flights from SNN?
Shannon Airport is best described as a high-latitude airport. The jet stream meanders across this latitude seasonally — SNN sees its strongest CAT exposure in December–February, when the polar jet pushes equatorward and routes intersect it more often.
When is turbulence worst for Shannon 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.
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