Readback—September 2024

IFR Staff

Tuesday, September 03, 2024 at 05:00 AM ET

Verified

Key Takeaways:

Wind gusts are primarily defined by variations in wind velocity (10+ knots difference between lulls and peaks), are caused by turbulent flow due to thermal instability or friction, and can contribute to wind shear.
When issuing an IFR pop-up clearance, controllers are to confirm a pilot's IFR qualification; an emergency declaration is generally only necessary if a VFR pilot in IFR conditions cannot or refuses to fly VFR to an alternate airport.
GPS jamming incidents near airports, like the well-known case at Newark, stemmed from individual use of illegal jammers to avoid tracking, not necessarily a widespread common practice.
Descriptions for airport hot spots are located in specific sections of the Chart Supplement (before airport diagrams) and Terminal Procedure Publications, rather than directly on each airport's page.

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Wind Gusts?

I am trying to understand wind gusts, in particular those lower-level ones we encounter when we are landing or taking off. What is the actual cause of these? Are they sudden changes in the velocity of the wind (e.g. going rapidly from a 20-knot headwind to a 10-knot headwind and then back)? Or are they rapid changes in wind direction (e.g. going from a 20-knot headwind to 20-knot crosswind and then back)? Plus, do they always lead to lower-level wind shear problems?

—Elliot Perlman, Providence, Rhode Island