The National Weather Service in Honolulu said just after 8 a.m., radar showed an area of heavy rain had moved southwest into the lower sections of Hawaii Volcanoes National Park. Excessive rainfall may lead to flash flooding in urban areas such as Roanoke and Martinsville, and along creeks, streams an low-lying areas.
The storm is expected to start clearing out by Monday afternoon. Flash flood watches are in effect for Sullivan County until 8 p.m. and Orange County until 6 p.m. Wind advisories also have been issued for Sullivan and Ulster counties. Rapidly rising flood waters may inundate roadways quickly.
Traveling can be impacted due to torrential downpours and potential flooding as the storms move through, according to the NWS.
Flash flood watches are scheduled to begin between midnight and 2 a.m. for parts of Camden, Gloucester, Hunterdon, Mercer, Middlesex, Morris, Burlington, Somerset, Sussex, Warren, Essex, Bergen, Union and Hudson.
Temperatures are expected to rise to the 55 to 65 degree range this morning for most areas, but the southern Poconos will stay in the 40s.
The rain is being blamed for a series of motor vehicle accidents around the region.