What feature is normally associated with the cumulus stage of a thunderstorm?

• A. Continuous updraft
• B. Downdraft predominance
• C. Gust fronts only
• D. No vertical motion

Answer: (A)

The main idea here is that the cumulus stage is driven by strong, continuous updrafts. Warm, moist air rises vigorously, and as it climbs, it cools and the water vapor condenses into visible cloud—producing a growing cumulus cloud. Since these updrafts keep the droplets aloft, rain hasn’t started in earnest yet, so you see a tall, developing cloud rather than a rain-dominated storm. This ongoing upward motion is what sets the cumulus stage apart.

As the storm progresses, downdrafts from precipitation start to form and eventually dominate in the mature and dissipating stages, bringing air down to the surface and often producing outflow gust fronts. That’s why other options don’t fit the cumulus stage: downdrafts predominate later, gust fronts are associated with the mature stage’s outflow, and there is real vertical motion during the buildup.