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1979 Red River Valley tornado outbreak
The 1979 Red River Valley tornado outbreak was a tornado event that occurred on April 10, 1979 near the Red River Valley. It is noted for the F4 tornado that hit Wichita Falls, Texas and is commonly referred to as "Terrible Tuesday" by many meteorologists. Additional ones were reported across the Southern Plains as well as in the Mississippi River Valley on April 10-11, 1979.
==Formation of the tornadoes==
A deepening low pressure system formed in Colorado as a warm front lifted north pulling warm, moist, unstable air. There was strong upper level dynamics all coming together to produce strong tornado-producing supercells. In the early afternoon hours, three supercell thunderstorms formed. They moved northeastward, and as a trio spawned families of tornadoes. These supercells caused the most damaging tornadoes of the outbreak.
The first tornado formed near Crowell, Texas at around 3:05 p.m. About 35 minutes later, the first killer one of the outbreak ripped through Vernon and killed 11 people. Then the supercell spawned one that killed three people in Lawton, Oklahoma. The second supercell spawned one that moved .
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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