GATLINBURG, Tenn. -

A forecast for heavy rain has Smokies rangers cautioning visitors to be wary around mountain streams.   

The National Weather Service said a nearly stationary frontal boundary and a strong upper-level trough will bring copious moisture from the Gulf into the southern Appalachians over the Fourth of July and the weekend.    

Showers and thunderstorms will become more widespread by Wednesday night with persistent and sometimes heavy rainfall bringing on the possibility of flooding.    

In the Great Smoky Mountains National Park, Acting Chief Ranger Steve Kloster encourages all visitors to be extremely cautious around rivers as conditions can change unpredictably.          

A park visitor from Ontario, Canada, died in March when his kayak capsized in the Little River.