Question

Which is a common first indicator of an approaching thunderstorm?

a. A buildup of dark clouds
b. A decrease in wind speed
c. A glassy sheen on the water surface
d. The development of a fog bank

Answer 1

A buildup of dark clouds is a common first indicator of an approaching thunderstorm, often accompanied by increasing wind and thunder as the storm draws near.

Step-by-step explanation:

The common first indicator of an approaching thunderstorm is a buildup of dark clouds. These clouds often appear as towering, ominous formations, typically of a deep grey or black color, signaling that the atmosphere is becoming unstable and that precipitation is likely. As the storm approaches, you may also observe other signs such as increased wind speeds, thunder, and lightning.

Descriptions of the changing sky and weather conditions in various texts illustrate the darkening of the sky and the increase in wind speed as heralds of an impending storm. For instance, a bank of purple and black clouds, with a low, rumbling sound of thunder, indicates that a storm is likely on its way. Atmospheric changes, such as a sudden decrease in barometric pressure, can lead to severe weather events, including thunderstorms.