1. Too hot
  2. Heavy wind
  3. A buildup of dark clouds
  4. Lightning

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Answer: Option 3

They usually appear as swift-moving black clouds, often approaching from the northwest southwest, south or west at speeds of 25-35 knots. You can determine the distance of an approaching thunderstorm by counting the number of seconds between the lightning flash and the thunder clap, and dividing by five.

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