Which is a common first indicator of bad weather approaching?
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
The Correct answer and Explanation is:
The correct answer is A. A buildup of dark clouds.
Explanation
The buildup of dark clouds is a commonly recognized first indicator of approaching bad weather. This phenomenon occurs as warm, moist air rises into the atmosphere, cooling and condensing to form clouds. As this process continues, particularly when a low-pressure system is moving into the area, the clouds become increasingly dense and dark, indicating that precipitation is likely. These dark clouds are often stratocumulus or cumulonimbus clouds, which are associated with thunderstorms, heavy rain, or other severe weather conditions.
In meteorology, dark clouds often signal that the atmosphere is becoming unstable. When warm air rises, it creates an updraft, which can lead to the formation of cumulonimbus clouds, known for their towering structure and potential for severe weather events, including thunderstorms, hail, and tornadoes. The dark color of these clouds is primarily due to the presence of a significant amount of water droplets or ice crystals within them, which block sunlight.
Other options, while related to weather changes, do not serve as reliable first indicators of bad weather. For instance, B. A decrease in wind speed is typically not a direct indicator of approaching bad weather. In many cases, wind speeds may increase with the approach of storms due to the pressure differences created by weather systems.
C. A glassy sheen on the water surface can indicate calm before a storm but may not be a specific sign of bad weather.
D. The development of a fog bank can occur under various conditions and does not necessarily correlate with impending severe weather.
In summary, the buildup of dark clouds is the most reliable and observable first sign of deteriorating weather conditions, serving as a warning for impending storms or rain.