AGL Ceiling Wind Shear 
Pilot Institute
NOVEMBER 5, 2024
Cloud ceilings below 1,500 feet or cumulonimbus clouds can trigger a SPECI. 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. Thunderstorms can also bring wind shear and lightning. A2992 : Altimeter setting of 29.92
Air Facts
APRIL 24, 2024
We had light winds, good visibility, full cloud cover, and ample ceiling heights. What was changing, however, wasn’t the visibility, or ceiling heights, or wind—at least not perceivably. Then, descending through just a few hundred feet AGL, and a few hundred yards from the end of the runway, the turbulence diminished.
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