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No. That would be a severe thunderstorm watch. A severe thunderstorm warning means that a severe thunderstorm ha already formed.
Most of them are very small i guess, but the small severe thunderstorm can be very serious and deadly.
the most dangerous thunderstorm is severe thunderstorms
The air is very fast. Especially in a severe thunderstorm. The wind can go as fast as 100mph.
A cold front is more severe because it is steeper.