Still, scientists have uncovered key clues about how these powerful forces emerge from severe thunderstorms. Tornadoes don't just appear out of nowhere. They need the perfect storm to form. It starts ...

ESPECIALLY AFTER LAST YEAR’S TORNADO OUTBREAKS. SO LET’S START WITH OUR SURFACE WINDS MOVING ONE DIRECTION AT ONE SPEED, THEN ADDING STRONGER UPPER LEVEL WINDS. WE’LL WATCH THESE MOVE A ...