Seattle to Spokane Turbulence Forecast

SEA → GEG · 223 miles · ~57m

What to Expect

Your upcoming flight from Seattle to Spokane is a quick hop east across Washington State, but it does cross some interesting terrain that can influence turbulence. Shortly after takeoff, you'll be flying over the Cascade Mountains, which are known for creating what's called Mountain Wave Turbulence. This happens when strong winds blow across the mountains and create waves in the air, much like waves in the ocean, causing some bumpiness. Later in the flight, as you approach Spokane, there's a possibility of encountering Clear-Air Turbulence, or CAT, especially closer to the Pacific Coast. CAT can occur even when the sky looks perfectly clear; it's often caused by wind shear at higher altitudes. Pilots are very familiar with these patterns and use weather forecasts and reports from other aircraft to navigate them safely. It's all a normal part of flying this route.

The flight between Seattle and Spokane 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.

When Is This Route Bumpiest?

For the smoothest possible ride on this route, aim for the summer or early fall. During these months, the winds tend to be calmer, reducing the likelihood of both Mountain Wave Turbulence over the Cascades and Clear-Air Turbulence. Conversely, fall, winter, and early spring can be a bit bumpier. Stronger winds during these seasons increase the chance of mountain waves forming as air passes over the Cascades, and jet stream activity can contribute to clear-air turbulence, especially near the coast.

Tips for This Flight

If you're concerned about turbulence, booking a morning flight is often your best bet because the air tends to be calmer earlier in the day. Any turbulence you might experience on this route is most likely to feel like driving on a road with a few potholes, rather than anything dramatic. For extra comfort, consider choosing a seat over the wing, as this area tends to experience less motion during turbulence. Remember to stay hydrated and take slow, deep breaths; focusing on your breathing can really help you feel more relaxed. The pilots and crew are well-trained to handle any situation, and they'll do everything they can to ensure a safe and comfortable flight.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.