FAA Private Pilot Helicopter (PRH)WeatherHard
A pilot notices that a fast-moving cold front is approaching the departure airport. Which set of weather changes should the pilot expect as the front passes?
- AAn abrupt wind shift, a sharp temperature drop, and a narrow band of showers or thunderstorms with possible turbulence
- BClearing skies with no wind change and steadily falling barometric pressure
- CIncreasing cirrus and altostratus clouds over 24 hours with no significant wind change
- DGradual wind shift, steady light rain, and slowly rising temperatures
Show answer & explanationAnswer & explanation
Correct answer: A. An abrupt wind shift, a sharp temperature drop, and a narrow band of showers or thunderstorms with possible turbulence
Fast-moving cold fronts are characterized by a narrow band of intense weather including cumulonimbus clouds, heavy showers or thunderstorms, and turbulence, followed by an abrupt wind shift (typically clockwise in the Northern Hemisphere) and a rapid temperature drop as colder air replaces warmer air.
Why the other options are wrong
- B. Cold front passage is typically accompanied by rising, not falling, pressure after passage, along with wind changes.
- C. Gradual buildup of cirrus and altostratus over many hours describes a warm front's approach, not a fast-moving cold front.
- D. Gradual wind shifts, steady light rain, and warming are characteristic of a warm front, not a cold front.
Cold Front Passage
A cold front occurs where advancing cold air undercuts and lifts warmer air, producing a narrow zone of intense, often severe weather followed by a rapid temperature drop and wind shift.
- Fast-moving fronts produce narrow bands of cumulonimbus, showers, and possible thunderstorms
- Abrupt wind shift, often clockwise, occurs at passage in the Northern Hemisphere
- Temperature drops sharply and pressure typically rises after passage
- Turbulence and gusty surface winds are common near and behind the front
Memory trick: Cold front = 'Cold and Quick' — sharp change, sudden shift, short but violent