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Question

Difficulty: MediumAtmosphere and Weather

A weather station records a sudden meteorological transition characterized by rapidly building cumulonimbus clouds, brief but intense rain showers, a sharp drop in ambient air temperature, and a subsequent rise in barometric pressure. Which type of weather front has most likely passed over the station?

  1. A
    Warm front
  2. B
    Stationary front
  3. Cold frontAnswer
  4. D
    Evaporation fog zone

Answer

Cold front
A cold front forms when a dense cold air mass advances and wedges beneath a warmer, less dense air mass. The steep frontal slope forces the warm, humid air upward rapidly, leading to rapid adiabatic cooling, condensation, and the formation of towering cumulonimbus clouds. This rapid displacement causes brief, intense downpours followed by an immediate drop in surface temperature and an increase in barometric pressure as the denser air settles over the region.

Step-by-Step Solution

1
Analyze the cloud type and precipitation pattern
Cumulonimbus clouds and brief, heavy showers indicate strong vertical convective lifting rather than gentle stratiform ascent.
Towering vertical clouds require a steep lifting mechanism to rapidly force warm, buoyant air upward.
2
Evaluate the temperature and pressure changes after frontal passage
A sudden decrease in temperature combined with a rising barometric pressure indicates the arrival of a denser, colder air mass.
Cold air is denser than warm air, exerting higher atmospheric pressure at the surface as it replaces the displaced warm air mass.
3
Match the observed meteorological signatures to the corresponding frontal system
The combination of rapid convective uplift, heavy showers, a sharp temperature drop, and rising post-frontal pressure uniquely identifies a cold front.
Cold fronts are characterized by steep leading edges that produce rapid transitions and severe or convective weather.

Key Concept

Frontal Weather Systems and Cold Front Dynamics
Estimated Time:1m 0s
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Topics

Atmosphere and Weather

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