ROANOKE, Va. – Helene was a Category 4 major hurricane with maximum winds of 140 mph. However, this storm illustrated how ...

For a hurricane to form, two key conditions must be met: a weather disturbance, like a thunderstorm, that draws in warm surface air, and ocean water that is at least 80°F (27°C).

In the tropical Caribbean ... terrestrial ones. Weather systems can sometimes linger, producing persistent sunny and wind-free days, and providing the kinds of conditions that drive marine heat.

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