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A. Sudden drop in temperature
B. Increased wind speed
C. The sound of distant thunder
D. The formation of dark clouds
Correct Answer: D.
The formation of dark clouds
The earliest indicator of an approaching thunderstorm is usually the formation of dark clouds, especially cumulonimbus clouds. These towering clouds signal upward air movement and moisture accumulation that signify the incoming thunderstorm.
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A. A sudden drop in temperature - This may occur after the storm approaches or passes, not as the first indicator.
B. Increased wind speed - This typically follows cloud formation, especially when the storm is close. It's an early indicator, but not the earliest one.
C. The sound of distant thunder - Thunder can only be heard after lightning has already occurred, making it a later sign than cloud formation.
When warm, moist air rises upwards, it cools down fast, resulting in the moisture condensing into tiny droplets. This makes the cloud dense and makes it blocks the sunlight. This way, the cloud appears dark.
It varies depending on various factors, but usually, you have 30 minutes after dark clouds appear before a thunderstorm starts.
Not typically. Thunder results from lightning, which forms in cumulonimbus clouds — the same dark clouds associated with storms.
No, it isn’t safe to be outside when dark clouds are forming. The low visibility and incoming storm can create a hazardous environment. Especially the lightning strikes that make the situation even worse.
Weather apps can indeed predict thunderstorms before dark clouds form. They use satellite and weather data to predict thunderstorms before the dark clouds even form.
There are quite a few signs besides dark clouds that suggest an incoming storm. These include high wind speed, pressure drops, and distant thunder and lightning flashes are common indicators of the storm.