FAA Private Pilot Airplane (PAR)Weather Theory and ServicesMedium
A pilot's weather briefing warns of a squall line developing ahead of an approaching fast-moving cold front. What hazard is most characteristic of a squall line?
- ASteady, light rain spread evenly over a broad area
- BWidespread stratus clouds producing light continuous icing
- CA narrow band of active, often severe thunderstorms forming ahead of the front
- DFog formation concentrated along coastal regions
Show answer & explanationAnswer & explanation
Correct answer: C. A narrow band of active, often severe thunderstorms forming ahead of the front
A squall line is a narrow band of active, often severe thunderstorms that can form ahead of a fast-moving cold front, presenting hazards such as severe turbulence, hail, and strong wind shear.
Why the other options are wrong
- A. Squall lines produce intense, not steady light, precipitation.
- B. Stratus clouds with light icing describe stable weather, not the convective nature of a squall line.
- D. Fog is unrelated to the dynamic, convective nature of squall lines.
Squall Line
A narrow band of active thunderstorms, often forming ahead of and parallel to a fast-moving cold front, capable of producing severe turbulence, hail, and damaging winds.
- Often develops 50-300 miles ahead of the actual cold front
- Can produce more severe weather than the front itself
- Associated with severe wind shear and tornado potential
Memory trick: Squall line = a 'wall' of storms marching ahead of the front