Kona to Birmingham Turbulence Forecast

KOA → BHM · 4,308 miles · ~9h 7m

What to Expect

Okay, let's look at what to expect on your Kona to Birmingham flight. At 4308 miles heading northeast, it's a long one, and it crosses a variety of weather systems. Right after takeoff, you'll be over the open Pacific, which can have what's called Oceanic Clear-Air Turbulence, basically invisible bumps, and Oceanic Convection, the same kind of bumps you'd feel boating on a windy lake. As you cross the Mojave and Sonoran Deserts, expect some Thermal Turbulence, like driving on a washboard because of the hot air rising off the ground. Then you'll fly over the Southern Rockies, which can cause Mountain Wave Turbulence, like hitting a few small speed bumps. Later, you'll pass over Tornado Alley, where thunderstorms can stir up Severe Convective Turbulence; these are easily avoided with radar. Finally, you'll cross the Ozark Plateau, the Mississippi Valley, and the Southeast Interior, which can each have their own Convective Turbulence, like hitting potholes on a newly paved road. Pilots are trained to handle these conditions all the time.

The Kona to Birmingham route passes over the Southern Rockies in New Mexico and southern Colorado. While somewhat lower than the peaks to the north, these mountains still produce notable mountain wave turbulence, particularly when strong southwesterly winds aloft align perpendicular to the ridgeline.

Turbulence Factors on This Route

• Oceanic Clear-Air Turbulence: Transoceanic jet stream crossings produce extended stretches of clear-air turbulence over the open Pacific.
• Oceanic Convection: Isolated thunderstorms over warm Pacific waters can develop away from radar coverage, catching flights off guard.
• Thermal Turbulence: Extreme desert heating generates strong thermal updrafts that cause low-to-mid-level turbulence, especially in summer afternoons.
• Mountain Wave Turbulence: The Southern Rockies produce lee waves when southwesterly upper-level winds flow across the terrain.

When Is This Route Bumpiest?

For the smoothest flight, try to book your trip during the spring or early summer. Fall can also be relatively calm, especially late fall. Winter, late summer, summer, and late winter tend to be the bumpiest seasons for this route. This is because winter brings more frequent storms over the Pacific and the Rockies. Late summer, summer, and late winter cause more thermal activity over the deserts and convective activity across the southeast United States. In the end, keep in mind that weather is always changing.

Tips for This Flight

If possible, try to book a morning flight, as the air is often calmer then. Any turbulence you experience on this route will most likely feel like driving on a slightly bumpy road or, at most, hitting a series of small potholes. Stay well-hydrated before and during the flight, as that can help with any anxiety. Consider a seat over the wing, which tends to experience less motion. Remember that the pilots are highly skilled at navigating these conditions, and modern aircraft are built to withstand far more turbulence than you'll likely encounter; you're in good hands.

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Forecasts based on NOAA HRRR and GFS atmospheric model data.