A slow-moving cold front is the culprit. It will not only bring heavy rains but possibly also thunderstorms in the afternoon. Total rainfall predictions range from 1-3 inches in places. The heaviest rain is expected to coincide with high tide.
With the ground already wet, small streams, rivers and brooks across the lower Hudson Valley might react quickly to heavy rain and overflow their banks, the NWS said.
Monitor forecasts and be prepared in case the Watch is upgraded to a Warning.