What are the five warning signs that a tornado may occur?

Five warning signs that a tornado may occur include dark, greenish skies, large, low-lying clouds, hail or heavy rain followed by sudden calmness, loud, continuous roar or rumble similar to a freight train, and a visible rotating, horizontal cloud base. Additionally, a noticeable increase in wind speed and swirling debris can also indicate a tornado’s approach. It’s crucial to remain vigilant during severe weather conditions and seek shelter if these signs are observed.