Seattle to Raleigh-Durham Turbulence Forecast

SEA → RDU · 2,349 miles · ~5h 12m

What to Expect

Seattle to Raleigh-Durham is an eastbound flight that crosses a wide variety of geographic features, making for a mixed bag of potential turbulence. Shortly after takeoff, you might encounter mountain wave turbulence as you cross the Cascades. Once over the Pacific Coast, clear-air turbulence, or CAT, is possible. Further inland, you'll encounter the Northern Rockies where mountain waves could cause bumps. Crossing the Great Plains and the Upper Midwest, more CAT is possible. As you near your destination, there's potential for lake-effect turbulence near the Great Lakes, convective turbulence over the Mississippi Valley, and frontal turbulence over the Ohio Valley. Finally, the Southern Appalachians can cause mechanical turbulence. Each of these types of turbulence is well-understood, and pilots are trained to navigate them safely and smoothly.

The flight between Seattle and Raleigh-Durham passes over the Cascades, the volcanic mountain chain stretching from northern California through Washington. When moist Pacific air is forced up and over the Cascades, it creates both orographic turbulence and downstream wave activity. The terrain is especially steep near major volcanoes like Mount Rainier, amplifying the effect.

Turbulence Factors on This Route

• Mountain Wave Turbulence: The Cascades create lee waves and orographic turbulence, especially when Pacific weather systems push moist air over the range.
• Clear-Air Turbulence (CAT): Pacific jet streaks arriving onshore drive upper-level clear-air turbulence along the West Coast.
• 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.

When Is This Route Bumpiest?

The summer months offer the calmest flights along this route, with early fall also typically quite smooth. During these times, the air currents tend to be more stable over the plains and mountains, reducing the likelihood of significant turbulence. Fall, winter, early spring, and early summer tend to be the bumpiest times to fly this route due to stronger jet streams that cause CAT and increased storm activity that leads to convective turbulence. The mountains may also generate more wave turbulence during the colder months.

Tips for This Flight

Booking a morning flight can often lead to a smoother experience as the air is generally calmer earlier in the day. If you do experience turbulence, it often feels like driving over a bumpy road or a sudden dip. Choose a seat over the wing for a more stable ride, and remember to stay hydrated by drinking plenty of water before and during the flight. Deep, slow breaths can help you stay calm and relaxed, and know that the pilots are constantly monitoring conditions to ensure a safe flight.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.