Severe weather safety tips tornadoes tornadoes can produce winds greater than 300 mph, and can travel across the ground at up to 60 mph They can develop any time of day, any month of the year, but are most common in the afternoon and evening, and in the spring and fall Tornadoes are most common across the great plains and gulf states regions of the us More tornadoes occur in the united. ($15.00 each, plus $2.95 shipping and handling). Home conference overview tessa store become a conference sponsor donate contact us
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