Chicago Midway to Boise Turbulence Forecast

MDW → BOI · 1,444 miles · ~3h 23m

What to Expect

That Chicago Midway to Boise route offers a diverse aerial experience. Departing from Chicago, you might encounter some light chop over the Great Lakes; this is known as lake-effect turbulence and it's caused by cold air passing over the relatively warmer lake waters. As you head west, crossing the Ohio Valley, frontal turbulence can occur as you pass through weather fronts. Further along, over the Upper Midwest and Great Plains, anticipate the possibility of clear-air turbulence (CAT), which is often unexpected but generally not severe. Finally, as you approach Boise, the Northern Rockies can generate mountain wave turbulence; this is where the wind flows over the mountains, creating waves of air that can cause some bumpiness. These are all normal atmospheric phenomena, and pilots are very familiar with navigating them.

The Chicago Midway to Boise 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

• Lake-Effect Turbulence: The Great Lakes produce lake-effect convection and low-level wind shear from land-water temperature contrasts.
• Frontal Turbulence: The Ohio Valley is a preferred storm track where frontal boundaries and embedded convection create turbulence year-round.
• Clear-Air Turbulence (CAT): The Upper Midwest sits beneath frequent polar jet stream intrusions, producing clear-air turbulence at cruising altitudes.
• Mountain Wave Turbulence: The Northern Rockies generate powerful lee waves when Pacific fronts drive westerly flow across the high terrain.

When Is This Route Bumpiest?

For the smoothest possible ride, aim to fly this route in the summer, early fall, or fall. The atmosphere tends to be more stable during these months, reducing the likelihood of significant turbulence. Late fall, early winter, winter, spring, and early spring can be a bit bumpier. During these times, you're more likely to experience lake-effect turbulence off the Great Lakes, stronger frontal systems crossing the Ohio Valley, and more pronounced mountain wave activity over the Northern Rockies. Clear-air turbulence is possible year-round, but it's often more pronounced during the transitional seasons.

Tips for This Flight

If you're concerned about turbulence, booking a morning flight is generally a good idea, as the atmosphere tends to be more stable earlier in the day. Any turbulence you might encounter on this route typically feels like driving on a slightly bumpy road, not anything alarming. Choosing a seat over the wing can provide a more stable sensation, and staying well-hydrated can help you feel more comfortable. Remember to focus on your breathing, and know that the pilots are expertly trained to handle all types of weather conditions, ensuring a safe and smooth flight.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.