St. Louis to Kona Turbulence Forecast

STL → KOA · 4,082 miles · ~8h 40m

What to Expect

The St. Louis to Kona route, while long, traverses several well-defined weather zones. Expect some bumps as you cross the Mississippi Valley, where convective turbulence can occur. Tornado Alley is next, with the potential for severe convective turbulence, especially during certain times of the year. As you move west over the Great Plains, you might encounter clear-air turbulence, a phenomenon pilots are well-versed in navigating. Crossing the Front Range and Central Rockies will likely mean some mountain wave turbulence, caused by wind flowing over the peaks. The Mojave and Sonoran Deserts can create thermal turbulence from rising hot air. More mountain wave turbulence is possible over the Sierra Nevada. Near the Pacific Coast, anticipate more clear-air turbulence. Finally, over the vast Pacific, be prepared for oceanic clear-air turbulence and the possibility of oceanic convection. These are all normal occurrences, and your flight crew is highly skilled at managing them.

Flights between St. Louis and Kona 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

• Convective Turbulence: The Mississippi Valley is a breeding ground for squall lines and mesoscale convective systems that produce widespread turbulence.
• Clear-Air Turbulence (CAT): The jet stream frequently meanders over the Great Plains, producing wind shear and clear-air turbulence at cruising altitudes.
• Mountain Wave Turbulence: Strong westerly winds over the Front Range create oscillating waves that can produce sustained moderate turbulence at jet cruise levels.
• Thermal Turbulence: Extreme desert heating generates strong thermal updrafts that cause low-to-mid-level turbulence, especially in summer afternoons.

When Is This Route Bumpiest?

For the smoothest flight, aim to travel in the fall, when the atmosphere is generally more stable over much of the route. Winter, summer and early fall are also more mild. Spring and early summer tend to be bumpier due to increased convective activity over the Mississippi Valley, Tornado Alley, and the Great Plains. Late summer can also be a bit rougher due to the lingering effects of these weather patterns, particularly as the air masses transition. Mountain wave turbulence can occur throughout the year, but is often more pronounced during periods of strong winds aloft.

Tips for This Flight

Booking a morning flight is often your best bet for a smoother ride, as the atmosphere tends to be calmer earlier in the day. Any turbulence you encounter on this route is most likely to feel like driving on a bumpy, unpaved road for a few minutes. Choosing a seat over the wing can offer a slightly more stable experience. Remember to stay hydrated throughout the flight and practice deep, slow breathing; know that your pilots are constantly monitoring conditions and working to ensure a safe and comfortable journey.

Get Your Forecast

Related Routes

See all routes from St. Louis or to Kona.

More from St. Louis

More to Kona

Forecasts based on NOAA HRRR and GFS atmospheric model data.