Phoenix to Seattle Turbulence Forecast

PHX → SEA · 1,107 miles · ~2h 43m

What to Expect

Your Phoenix to Seattle flight, heading northwest for around 2 hours and 43 minutes, will likely have some turbulence, but nothing out of the ordinary. As you leave Phoenix, you'll cross the Mojave and Sonoran Deserts. This area is known for thermal turbulence, which is caused by warm air rising from the hot desert floor. Think of it like driving over a few speed bumps. Next, you’ll fly over the Cascade Mountains, where mountain wave turbulence can occur as wind flows over the peaks, creating atmospheric waves. Finally, as you approach Seattle and the Pacific Coast, you might experience clear-air turbulence (CAT), which is caused by wind shear at higher altitudes. Pilots are always monitoring conditions and adjusting altitude to find the smoothest ride possible.

The flight between Phoenix and Seattle 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

• Thermal Turbulence: Extreme desert heating generates strong thermal updrafts that cause low-to-mid-level turbulence, especially in summer afternoons.
• 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.

When Is This Route Bumpiest?

For the smoothest flight, aim for winter or fall. During these seasons, the desert heat is less intense, reducing thermal turbulence, and the mountain wave activity over the Cascades tends to be calmer. Summer and early spring are generally bumpier. The desert heat is strongest in summer, creating more thermal activity. In early spring, unsettled weather patterns can contribute to mountain wave and clear-air turbulence. However, it's important to remember that weather is variable, and even during bumpier seasons, many flights are perfectly smooth.

Tips for This Flight

If you're concerned about turbulence, booking a morning flight often results in a smoother experience, as the atmosphere tends to be more stable earlier in the day. Any turbulence you do encounter on this route is likely to feel like driving over small potholes in the road, and the plane is designed to handle it with no problems. Choosing a seat over the wing, closer to the plane's center of gravity, can also minimize the sensation of movement. Remember to stay hydrated and focus on slow, deep breaths to help you relax. Your pilots and flight crew are well-trained to handle any weather conditions and will always prioritize your safety and comfort.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.