Which weather phenomena require immediate altitude adjustments or avoidance?

Which weather phenomena require immediate altitude adjustments or avoidance?

• A. Windshear and light rain at low altitude
• B. Visual meteorologic conditions
• C. Icing, thunderstorms, gust fronts, and low visibility
• D. Clear skies with light breeze

Answer: (C)

Facing weather that demands immediate altitude changes or avoidance comes down to conditions that can rapidly degrade aircraft performance or safety. Icing, thunderstorms, gust fronts, and low visibility create acute hazards: icing thickens the airfoil with ice, raising stall speed and reducing lift; thunderstorms bring violent turbulence, strong updrafts/downdrafts, hail, and lightning; gust fronts cause sudden, powerful wind shifts that can shove the airplane off its intended flight path or altitude; and low visibility erodes situational awareness and obstacle clearance, making safe flight at the current altitude unlikely. Because of these dangers, adjusting altitude promptly or steering clear of the area is the prudent course. The other options involve weather that is either generally safe (visual meteorologic conditions, clear skies with light breeze) or doesn't inherently require immediate altitude changes as a primary response.

Facing weather that demands immediate altitude changes or avoidance comes down to conditions that can rapidly degrade aircraft performance or safety. Icing, thunderstorms, gust fronts, and low visibility create acute hazards: icing thickens the airfoil with ice, raising stall speed and reducing lift; thunderstorms bring violent turbulence, strong updrafts/downdrafts, hail, and lightning; gust fronts cause sudden, powerful wind shifts that can shove the airplane off its intended flight path or altitude; and low visibility erodes situational awareness and obstacle clearance, making safe flight at the current altitude unlikely. Because of these dangers, adjusting altitude promptly or steering clear of the area is the prudent course.

The other options involve weather that is either generally safe (visual meteorologic conditions, clear skies with light breeze) or doesn't inherently require immediate altitude changes as a primary response.