Weather Quiz

A continuous line of thunderstorms, or squall line, may form along or ahead of the front. Squall lines present a serious hazard to pilots as squall type thunderstorms are intense and move quickly. Squalls can occur at any altitude - they are not unique to high- or low-altitude operations.

The propeller produces thrust in proportion to the mass of air being accelerated through the rotating blades. If the air is less dense, propeller efficiency is decreased.

Any convective SIGMET implies severe or greater turbulence, severe icing, and low-level wind shear. The forecast may be issued for any of the following; severe thunderstorms due to: 1. Surface winds greater than or equal to 50 knots, or 2. Hail at the surface greater than or equal to 3/4 inch in diameter, or 3. Tornadoes, embedded thunderstorms, lines of thunderstorms.

The difference between the existing lapse rate of a given mass of air and the adiabatic rates of cooling in upward moving air determines if the air is stable or unstable.

Unmanned aircraft often have limited performance and therefore in high wind conditions, it may consume more power to maintain position or other maneuvers than in calm air. If the wind is strong enough, the sUAS's performance might not be able to adequately counter the wind, making it difficult or impossible to fly back to you for recovery.