Portland Maine to Salt Lake City Turbulence Forecast

PWM → SLC · 2,119 miles · ~4h 44m

What to Expect

Your Portland, Maine, to Salt Lake City flight will take you over a variety of terrain, each with its own potential for turbulence. Initially, you'll cross the Atlantic Seaboard, an area sometimes prone to clear-air turbulence or CAT, which is caused by shifting air currents at high altitudes. Then, you'll encounter the Northern Appalachians, where mechanical turbulence can occur as wind interacts with the mountains. As you continue west over the Great Lakes, be aware of potential lake-effect turbulence, especially if there's a big temperature difference between the air and water. The Upper Midwest and the Great Plains can also experience clear-air turbulence. Finally, as you approach Salt Lake City, you'll fly over the Central Rockies, where mountain wave turbulence, caused by air flowing over the mountains, is possible. Pilots are trained to anticipate and handle all these conditions routinely, adjusting altitude or course as needed.

Between Portland Maine and Salt Lake City, the flight path crosses the Central Rockies of Colorado and Utah. This area is one of the most turbulence-prone zones in the U.S., with mountain wave activity reported on more than half of winter days. Waves can propagate far downstream, meaning turbulence may begin well before or after the visible peaks.

Turbulence Factors on This Route

• Clear-Air Turbulence (CAT): The Atlantic coast jet stream and land-sea temperature contrasts create frequent clear-air turbulence at cruising altitude.
• Mechanical Turbulence: The Northern Appalachians generate low-level mechanical turbulence during strong post-frontal northwest winds.
• Lake-Effect Turbulence: The Great Lakes produce lake-effect convection and low-level wind shear from land-water temperature contrasts.
• Mountain Wave Turbulence: The Central Rockies produce frequent, sometimes severe, mountain waves that can extend 100+ miles downstream.

When Is This Route Bumpiest?

For the smoothest flight, aim for the summer or early fall. During these months, the conditions that cause turbulence over the Great Lakes and Rockies are typically calmer, and clear-air turbulence tends to be less frequent. Winter, late fall, early winter, and early spring tend to be bumpier times to fly this route. The combination of stronger jet streams contributing to clear-air turbulence, greater temperature differences over the Great Lakes, and more pronounced mountain wave effects over the Rockies can lead to a rockier ride.

Tips for This Flight

If you're concerned about turbulence, booking a morning flight often leads to smoother conditions. Any turbulence you encounter on this route will likely feel like driving on a bumpy road or a series of gentle jolts. To enhance your comfort, consider choosing a seat over the wing, as this area of the plane experiences less motion. Staying hydrated can also help you feel more relaxed. Remember that turbulence is a normal part of flying, and the pilots are always monitoring conditions to ensure a safe flight.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.