Build your own Raspberry Pi tornado warning system: 
At 4:30 in the afternoon on November 15, 1989, an F4 tornado ripped through Huntsville, Alabama killing 21 people. It could have been much worse save for the quick thinking of the people running the after-school program at Jones Valley Elementary. They took the children under the stairs as soon as the power went out. They survived, though the top floor was torn from the building. A mother out front who had come to pick up her child was among the 21 casualties.
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