F6 and F5 tornadoes are rare. Especially F6.
High heat and humidity and an approching cold front can trigger disaster of terrifing levels, indeed.
If an F5 or F6 went through the Dallas Frt worth area, as can easily happen, thousands would be unable to escape death.
Early warning would only increase the danger, as people try to evacuate. But those that take strong shelter would have a chance to live.
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