FAA Flight Instructor Airplane (FIA)Weather and Weather ServicesHard
A flight instructor explains that a fast-moving, narrow band of active thunderstorms can develop 50 to 300 miles ahead of an approaching cold front, sometimes forming with little apparent relationship to the front's actual position. What is this line of thunderstorms called?
- AA stationary front
- BA dry line
- CAn occluded front
- DPrefrontal (squall line) thunderstorms
Show answer & explanationAnswer & explanation
Correct answer: D. Prefrontal (squall line) thunderstorms
A squall line is a narrow band of active thunderstorms that often forms ahead of a cold front in the warm, unstable air mass. Squall lines can produce some of the most severe weather, including large hail, damaging winds, and tornadoes, and may develop independently of the front's exact position.
Why the other options are wrong
- A. A stationary front shows little to no movement and does not describe this fast-moving line of storms.
- B. A dry line separates moist and dry air masses, typically in the southern Plains, and is not the same as a squall line.
- C. An occluded front is formed when a fast cold front overtakes a slower warm front, unrelated to this prefrontal band.
Squall Line
A narrow, fast-moving band of active thunderstorms, often forming ahead of a cold front, capable of producing severe weather.
- Can form 50-300 miles ahead of the actual cold front
- Often produces severe turbulence, hail, and damaging straight-line winds
- Can develop with little apparent relationship to the front's position
Memory trick: Squall line sneaks ahead of the front like a scout squad of severe storms