AGL Knot Turbulence 
Plane and Pilot
NOVEMBER 27, 2024
Often, turbulence is the harbinger of mountain waves, not the ideal ceiling—and visibility unlimited—day. FAA weather charts can help for higher altitudes but when just a few thousand feet agl, they may be less useful. We experienced moderate turbulence even at our gate. I flew into that and the venturi effect that day.
Plane and Pilot
AUGUST 6, 2024
Also, from when I lived out West, there was the mountaintop clearance guideline—1,000 feet for every 10 knots of wind, with 30 knots meaning no-go. But if I was going VFR over strange territory, I would want lots more than 1,000 feet agl. The two considerations are turbulence and headwinds. And then there’s headwinds.
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Pilot Institute
MARCH 6, 2025
AGL Above Ground Level AGL is simply a way to tell the basis from which any given height or altitude is measured. Simply put, 400 feet AGL means that the 400 feet is measured from the underlying ground surface above the specific airspace. This is as opposed to other altitude measurements, such as AMSL or above mean sea level.
Air Facts
APRIL 24, 2024
But, with a frontal system approaching, the conditions were expected to worsen over the hours subsequent to our passing through, including the chance for moderate to severe turbulence. At first it was just gradually, then more decidedly, evolving into moderate turbulence. But the turbulence would continue to worsen. We weren’t.
Pilot Institute
MARCH 29, 2024
Fly at least 1,500 above ground level (AGL) to allow room for recovery in case you stall the aircraft. For a greater margin of safety, select an altitude that leaves you 1,500 feet AGL after recovery from a stall. Higher altitudes are also less prone to turbulence and have fewer birds. Target Altitude Pick a safe altitude.
Chess In the Air
JUNE 24, 2022
He only needed a glide ratio of 14:1 to reach the airfield to arrive at a typical pattern altitude of 1,000 ft AGL. At this point he still had an altitude of 8,275 ft MSL, i.e. 2,739 ft AGL. This is consistent with Rick’s report, which referenced 9 knots of wind. His altitude was 1339 AGL and his ground speed was 92 kts.
Pilot Institute
NOVEMBER 5, 2024
A sudden wind shift, a 10-knot or greater speed increase, a 45-degree or more direction change, or gusts exceeding limits may also cause a SPECI. This includes the wind direction in degrees and the wind speed in knots. Expect poor visibility, increased turbulence, and slippery runway surfaces.
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