-May 30, 6 A.M. East Coast

On the morning of May 30, rain began to fall from the Tidewater area of Virginia to New York. 

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The normal winds along the shores of the Middle and South Atlantic states are from south to west. But
such was the distribution of pressure over the Atlantic...that, on the morning of the 30th, the winds were blowing steadily from the south and east. (John Bach McMaster, The Johnstown Flood, 210 (1933.)