Spokane to Des Moines Turbulence Forecast

GEG → DSM · 1,242 miles · ~2h 59m

What to Expect

Your flight from Spokane to Des Moines crosses a variety of terrains, so let's talk about what that means for potential turbulence. Departing Spokane, you'll first encounter the Northern Rockies. This area is known for mountain wave turbulence, which is caused by air flowing over the mountains; think of it like water rippling over rocks in a stream. As you continue east over the Great Plains and into the Upper Midwest, you might experience clear-air turbulence, or CAT. CAT is caused by differences in air pressure and wind speed at high altitudes, and it can occur even when the sky looks perfectly clear. Remember, pilots are well-versed in navigating these common atmospheric conditions, and they use sophisticated tools to monitor and avoid significant turbulence whenever possible.

The Spokane to Des Moines route crosses the Northern Rockies, a rugged expanse of high peaks in Montana, Idaho, and Wyoming. Mountain wave turbulence is frequent here, especially when Pacific storm systems push strong winds over the Continental Divide. Pilots often report moderate chop between 30,000 and 40,000 feet over this region.

Turbulence Factors on This Route

• Mountain Wave Turbulence: The Northern Rockies generate powerful lee waves when Pacific fronts drive westerly flow across the high terrain.
• Clear-Air Turbulence (CAT): The jet stream frequently meanders over the Great Plains, producing wind shear and clear-air turbulence at cruising altitudes.

When Is This Route Bumpiest?

For the smoothest possible flight, aim for summer or early fall. During these months, the atmosphere tends to be more stable, reducing the likelihood of both mountain wave turbulence over the Rockies and clear-air turbulence across the plains. Late fall, winter, early spring, and spring tend to be bumpier. During these seasons, stronger winds and greater temperature differences create more atmospheric instability, increasing the chance of encountering turbulence, especially as air moves over the mountains.

Tips for This Flight

If you're concerned about turbulence, booking your flight for the morning is often a good strategy, as the atmosphere tends to be calmer earlier in the day. Any turbulence you do experience on this route will likely feel like driving on a bumpy, slightly rutted dirt road. To help stay comfortable, choose a seat over the wing; this area experiences less motion. Staying hydrated and practicing deep, slow breathing exercises can also help manage any anxiety and make your flight more pleasant. Remember, the pilots and crew are there to ensure a safe and comfortable journey, and they're well-prepared to handle any conditions you might encounter.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.