San Francisco to Spokane Turbulence Forecast

SFO → GEG · 733 miles · ~1h 58m

What to Expect

The flight from San Francisco (SFO) to Spokane (GEG) is a relatively quick hop north, just under two hours. A good portion of it involves crossing some interesting geographic features that can contribute to turbulence. Soon after takeoff, you'll be flying over the Pacific Coast. This is where pilots often encounter clear-air turbulence, or CAT. CAT is caused by shifting air currents high in the atmosphere, even when the skies look perfectly clear. Later, you'll cross the Cascade Mountains. These can create something called mountain wave turbulence, which is caused by wind flowing over the peaks and creating waves in the air. Pilots are very familiar with both CAT and mountain wave turbulence. They constantly monitor weather conditions and use sophisticated tools to anticipate and navigate these areas, ensuring a safe and, as much as possible, comfortable flight.

The flight between San Francisco 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

• Clear-Air Turbulence (CAT): Pacific jet streaks arriving onshore drive upper-level clear-air turbulence along the West Coast.
• Mountain Wave Turbulence: The Cascades create lee waves and orographic turbulence, especially when Pacific weather systems push moist air over the range.

When Is This Route Bumpiest?

For the smoothest possible ride on this route, aim for the summer or early fall. The weather is typically more stable during these months, reducing the likelihood of both clear-air and mountain wave turbulence. Winter, early spring, and fall tend to be bumpier. During the colder months, stronger winds interacting with the Pacific Coast and the Cascades can generate more turbulence. This is a normal seasonal pattern, and pilots are well-prepared for it, but if you're concerned about bumps, a summer flight might be preferable.

Tips for This Flight

If you're feeling anxious, consider booking a morning flight, as the air tends to be calmer earlier in the day. Any turbulence you might encounter on this San Francisco to Spokane route is usually more like driving on a slightly bumpy road than anything alarming. To help stay relaxed, choose a seat over the wing, as this area tends to experience less motion. Remember to stay hydrated by drinking plenty of water before and during the flight, and focus on slow, deep breaths. With a little preparation, you can feel more at ease and enjoy the journey.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.