From the National Weather Service:
The wall of blowing sand and dust first blasted into the eastern Oklahoma panhandle and far northwestern Oklahoma around 4 PM on April 14, 1935.
It raced to the south and southeast across the main body of Oklahoma that evening, accompanied by heavy blowing dust, winds of 40 MPH or more, and rapidly falling temperatures.
But the worst conditions were in the Oklahoma and Texas panhandles, where the rolling mass raced more toward the south-southwest - accompanied by a massive wall of blowing dust that resembled a land-based tsunami.
According to the reports, three little words rule life in the dust bowl – “if it rains.”
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