Boise to Des Moines Turbulence Forecast

BOI → DSM · 1,153 miles · ~2h 48m

What to Expect

Flying east from Boise (BOI) to Des Moines (DSM) means crossing some interesting terrain that can affect the smoothness of your flight. Shortly after takeoff, your plane will be over the Northern Rockies, which are known for something called Mountain Wave Turbulence. This happens when strong winds high in the atmosphere flow over the mountains, creating waves of air similar to ripples in a stream. As the plane encounters these waves, you might feel some moderate bumps. Later in the flight, over the Great Plains, you might experience Clear-Air Turbulence (CAT). CAT is caused by colliding air currents at high altitudes and can occur even when the sky looks perfectly clear. Pilots are very familiar with both of these phenomena and use weather forecasts, pilot reports, and onboard radar to anticipate and navigate them safely. Think of it as driving on a road with occasional potholes; your skilled driver knows they're there and how to handle them.

The Boise 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?

The summer and fall months generally offer the smoothest flights on this route. The atmosphere tends to be more stable during these times, reducing the likelihood of both Mountain Wave Turbulence and Clear-Air Turbulence. Late fall, winter, early spring, and spring can be bumpier. During these seasons, stronger winds in the upper atmosphere interacting with the Rockies increase Mountain Wave Turbulence. Temperature differences in the atmosphere, common in the other seasons, contribute to Clear-Air Turbulence over the Plains.

Tips for This Flight

If you're concerned about turbulence, consider booking your flight for earlier in the day, as the atmosphere tends to be calmer in the mornings. Any turbulence you experience on this route is most likely to feel like driving over a series of small dips in the road or, at most, a brief roller coaster sensation. For added comfort, choose a seat over the wing, where the ride is typically less noticeable. Staying well-hydrated can also help you feel more relaxed. Remember, the pilots and crew are trained to handle these conditions, and your safety is their top priority. The flight will be over before you know it.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.