FAA Private Pilot Airplane (PAR)Weather Theory and ServicesHard
A pilot flying near a developing thunderstorm notices very heavy rain, frequent lightning, and strong gusty surface winds spreading outward from the storm, along with both updrafts and downdrafts occurring simultaneously within the cell. Which stage of the thunderstorm life cycle is this?
- ADissipating stage
- BMature stage
- CCumulus stage
- DTowering cumulus stage without precipitation
Show answer & explanationAnswer & explanation
Correct answer: B. Mature stage
The mature stage is marked by the onset of precipitation reaching the surface, the coexistence of strong updrafts and downdrafts, heavy rain, lightning, and gusty surface winds from the downdraft outflow (gust front). This is the most hazardous stage of a thunderstorm's life cycle.
Why the other options are wrong
- A. The dissipating stage is dominated by downdrafts only, with rain tapering off.
- C. The cumulus stage features only updrafts and no precipitation, prior to the storm maturing.
- D. Towering cumulus without precipitation describes an earlier growth phase, not full maturity.
Thunderstorm Life Cycle - Mature Stage
The mature stage of a thunderstorm is characterized by simultaneous strong updrafts and downdrafts, heavy precipitation, lightning, and gusty outflow winds, making it the most hazardous phase for aviation.
- Cumulus stage: updrafts only, no precipitation
- Mature stage: updrafts + downdrafts, heavy rain, lightning, gust front
- Dissipating stage: downdrafts dominate, precipitation decreases
- Gust front from mature stage can cause severe low-level wind shear
Memory trick: Cumulus builds, Mature roars, Dissipating fades