The National Weather Service says Phillipsburg, Andover, Washington Township in Morris County and Lebanon have received more than 5 inches of rain within a 12-hour period.
Flood warnings are posted along parts of the Passaic, Raritan, Rockaway, Pequannock, Millstone, Ramapo and Wanaque rivers.
Major flooding is forecast for the Passaic River at Little Falls.
Forecasters predict moderate flooding for the Millstone River at Blackwells Mills, the Raritan River at Manville and Bound Brook, and the Wanaque River at Wanaque Dam.
