Otto is packing maximum sustained winds of 75 mph and moving west-northwest at 5 mph.
The storm located in the southwestern Caribbean is expected to bring heavy rain to Central America this week. The storm is no threat to Florida and is expected to move into the Pacific Ocean.
Outer rain bands from Otto are expected to produce rainfall accumulations of 3 to 6 inches across portions of central and western Panama and southeastern Costa Rica through Wednesday, with isolated totals upwards of 10 to 15 inches across the higher terrain.
The National Hurricanes Center said these rains could result in life-threatening flash floods and mud slides.
Additional heavy rainfall may move into portions of Costa Rica Wednesday night into Thursday as the system approaches the coast.