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Lesson 6.4 – Thunderstorms, Turbulence, Icing & Other Hazards
Hazardous weather can turn a routine flight into a dangerous situation very quickly. The most important rule for private pilots is simple: avoid thunderstorms by a wide margin. Understanding how these hazards form and what they can do will help you make better decisions.
Reference:
FAA Pilot’s Handbook of Aeronautical Knowledge (PHAK), Chapter 12 – Weather Theory
Aeronautical Information Manual (AIM), Chapter 7
Thunderstorms
Thunderstorms
Thunderstorms require three ingredients:
Sufficient moisture
Unstable air
A lifting force
Stages of a Thunderstorm:
Cumulus stage – Strong updrafts, growing cloud.
Mature stage – Updrafts and downdrafts exist together; this is the most dangerous stage (heavy rain, hail, turbulence, lightning, possible tornadoes).
Dissipating stage – Mostly downdrafts; rainfall decreases.
Critical Safety Point:
Do not fly into or under a thunderstorm. The hazards (extreme turbulence, hail, icing, wind shear, and lightning) can exceed the capabilities of any light aircraft. Give thunderstorms a wide berth — many instructors recommend at least 20 nautical miles.
Turbulence
Turbulence
Turbulence can occur in many situations:
Convective turbulence (from surface heating)
Mechanical turbulence (wind flowing over terrain or buildings)
Mountain wave turbulence
Clear air turbulence
Turbulence associated with fronts and thunderstorms
Always secure loose objects and keep passengers seated with seat belts fastened when turbulence is expected or encountered.
Icing
Icing
Aircraft icing requires two conditions:
Visible moisture (clouds or precipitation)
Temperatures at or below freezing
Types of icing:
Rime ice – Rough, milky, and brittle
Clear ice – Smooth, hard, and transparent (usually more dangerous)
Mixed ice – Combination of rime and clear
Icing reduces lift, increases drag and weight, and can affect the propeller, antennae, and pitot-static system. The best defense is to avoid icing conditions or exit them quickly.
Other Hazards
Other Hazards
Wind Shear – Sudden change in wind speed or direction; especially dangerous during takeoff and landing.
Microbursts – Intense, localized downdrafts associated with thunderstorms.
Fog – Can form rapidly when the temperature–dew point spread is small.
Dust storms / Haboobs and whiteouts – Can severely reduce visibility.
Key Points to Remember
Key Points to Remember
Never fly into or under a thunderstorm. Avoid them by a wide margin.
Thunderstorms need moisture, unstable air, and lifting — and they produce the most severe weather hazards light aircraft can encounter.
Icing requires visible moisture and freezing temperatures — avoid it or leave it quickly.
Turbulence, wind shear, and microbursts can occur with little warning; keep seat belts fastened.
Links:
Intro to Aviation & Airplanes
Airfoils, Lift & Angle of Attack
Stalls, Critical Angle of Attack & Spin Awareness
Primary Flight Controls & the Three Axis
Stability, Controllability & Adverse Yaw
Engine Instruments & System Monitoring
Pilot Certification & Privileges
Medical Certificates & BasicMed
Flight Rules (Part 91 Highlights)
Airport Marking, Signs, & Lighting
Traffic Patterns & Airport Operations
Special Use Airspace & Other Airspace Areas
Airport Facility Directory & Chart Reading
The Atmosphere & Atmospheric Pressure
Airmasses, Fronts & Weather Patterns
Thunderstorms, Turbulence, Icing & Other Hazards
Weather Reports, Forecasts & Charts
Common Weak Areas & How to Fix Them
Private Pilot Privileges & Limitations
Lesson 11.2
Currency Requirements
Medical Certification & Basic Med After the Check ride
Continuing Education & Proficiency
Engine Failure & Forced Landings
In-Flight Fires & Electrical Problems
System and Instrument Failures
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