The Meteorological Service has upgraded the flash flood watch to a flash flood warning for low-lying and flood-prone areas of St Mary, Portland, St Thomas, Kingston, St Andrew, St Catherine, Clarendon, and Manchester.
The measure means flooding has been reported or will occur shortly.
Motorists and pedestrians should not attempt to cross flooded roadways or other low-lying areas as strong currents are likely.
Residents in low-lying areas should be on the alert for rising waters and be ready to move quickly to higher ground.
Meanwhile, the flash flood watch for low-lying and flood-prone areas of Hanover, St James, Trelawny, St Ann, St Elizabeth, and Westmoreland has been continued.
Both alerts will remain in place until 5:00 p.m. Saturday.