Seattle to Kona Turbulence Forecast

SEA → KOA · 2,689 miles · ~5h 53m

What to Expect

The Seattle to Kona route presents a few common turbulence scenarios, but nothing pilots aren't prepared for. Immediately after takeoff from Seattle, you might encounter Mountain Wave Turbulence as you cross the Cascades, caused by air flowing over the mountains. As you head southwest over the Pacific Coast, be prepared for Clear-Air Turbulence (CAT), which is often found at higher altitudes. The majority of your flight will be over the open Pacific Ocean, where you could experience Oceanic Clear-Air Turbulence, similar to CAT but influenced by oceanic weather patterns. Finally, Oceanic Convection can create bumps as warm air rises from the ocean surface; pilots use onboard radar to navigate around this. Remember, these are standard conditions, and pilots are highly trained to manage them, prioritizing passenger safety and comfort.

The flight between Seattle and Kona passes over the Cascades, the volcanic mountain chain stretching from northern California through Washington. When moist Pacific air is forced up and over the Cascades, it creates both orographic turbulence and downstream wave activity. The terrain is especially steep near major volcanoes like Mount Rainier, amplifying the effect.

Turbulence Factors on This Route

• Mountain Wave Turbulence: The Cascades create lee waves and orographic turbulence, especially when Pacific weather systems push moist air over the range.
• Clear-Air Turbulence (CAT): Pacific jet streaks arriving onshore drive upper-level clear-air turbulence along the West Coast.
• Oceanic Convection: Isolated thunderstorms over warm Pacific waters can develop away from radar coverage, catching flights off guard.

When Is This Route Bumpiest?

For the smoothest flight, aim to travel during the summer or early fall. The atmosphere tends to be more stable over the Pacific during these months, reducing the chances of significant turbulence. In contrast, late summer, fall, winter, and early spring tend to be bumpier. This is because the jet stream is stronger and more active, leading to increased Clear-Air Turbulence. Also, stronger winds over the Cascades can amplify Mountain Wave Turbulence during the cooler months.

Tips for This Flight

Booking a morning flight often leads to a smoother experience since the atmosphere is typically more stable earlier in the day. If you do experience turbulence, it's most likely to feel like driving on a bumpy, unpaved road for a few minutes. To stay comfortable, choose a seat over the wing; it's the most stable part of the plane. Remember to stay hydrated and practice deep, slow breathing. The crew is there to assist you, and turbulence is a normal part of flying, not a sign of danger.

Get Your Forecast

Related Routes

See all routes from Seattle or to Kona.

More from Seattle

More to Kona

Forecasts based on NOAA HRRR and GFS atmospheric model data.