Weak low pressure formed off the East Coast, but near New York City, it took the form of a north-south oriented trough. ( MORE: What To Do To Stay Safe In A Flash Flood)įirst, a slow-moving spin of low pressure aloft approached the Northeast from the Great Lakes, where it helped to wring out heavy rain in the upper Midwest earlier in the week.Ī deep plume of tropical moisture was then pulled northward from the western Caribbean Sea toward the Northeast. Why this happened: This was yet another case in which you don't need a tropical depression, storm or hurricane to produce flooding rain.
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