Denver to Portland Maine Turbulence Forecast

DEN → PWM · 1,778 miles · ~4h 3m

What to Expect

That Denver to Portland, Maine, route is a real journey across the country, and it does cross a few zones known for turbulence. Right after takeoff from Denver, you might feel some bumps as you cross the Front Range; that's mountain wave turbulence, and it's common. Then, over the Great Plains and Upper Midwest, keep an eye out for clear-air turbulence, or CAT, which can happen even when the sky looks perfectly clear. As you approach the Great Lakes, there’s a chance of lake-effect turbulence, especially if it's a cooler time of year. Finally, as you fly over the Northern Appalachians and approach the Atlantic seaboard, you might encounter mechanical turbulence. All of these types are well-understood, normal weather patterns; pilots are prepared for them, and your flight will be monitored constantly.

Flights between Denver and Portland Maine pass along the Front Range, where the abrupt rise of the Colorado Rockies generates some of the strongest mountain wave turbulence in the continental U.S. Downdrafts east of the ridgeline can be intense, and rotor turbulence near the surface sometimes extends to cruising altitude during high-wind events.

Turbulence Factors on This Route

• Mountain Wave Turbulence: Strong westerly winds over the Front Range create oscillating waves that can produce sustained moderate turbulence at jet cruise levels.
• Clear-Air Turbulence (CAT): The jet stream frequently meanders over the Great Plains, producing wind shear and clear-air turbulence at cruising altitudes.
• Lake-Effect Turbulence: The Great Lakes produce lake-effect convection and low-level wind shear from land-water temperature contrasts.
• Mechanical Turbulence: The Northern Appalachians generate low-level mechanical turbulence during strong post-frontal northwest winds.

When Is This Route Bumpiest?

For the smoothest possible flight, aim for summer or early fall; these seasons tend to be much calmer over most of the route. Winter, early spring, late fall, and early winter can be bumpier, especially crossing the Front Range and the Great Lakes; these are prime times for mountain wave and lake-effect turbulence, respectively. Clear-air turbulence can happen any time of year, but is more common in the shoulder seasons.

Tips for This Flight

If possible, booking a morning flight can often lead to a smoother ride. Any turbulence you might encounter on this route is most likely to feel like driving on a slightly bumpy road or hitting a few small potholes. To stay comfortable, choose a seat over the wing, as it experiences less motion. Staying well-hydrated can also help you feel more relaxed; remember that the crew are trained to handle any situation, and they’re there to support you.

Get Your Forecast

Related Routes

See all routes from Denver or to Portland Maine.

More from Denver

More to Portland Maine

Forecasts based on NOAA HRRR and GFS atmospheric model data.