The Meteorological Service has issued a Severe Weather Alert for all parishes effective Sunday until Monday.
Tropical Storm Isaac is now located over the eastern Caribbean Sea and is forecast to move south of Jamaica on Sunday, as a tropical depression, producing significant rainfall activity across the island through to early next week.
A statement from the Meteorological Service said periods of showers and thunderstorms, which may be very heavy at times, are forecast to affect most parishes.
Rainfall totals of 50 to 100 millimetres are possible, as well as isolated amounts up to 150 millimetres, therefore, flash-flooding is likely over low-lying and flood-prone areas.
Fishers and other marine interests are advised to exercise extreme caution as sea conditions will deteriorate in the vicinity of showers, thunderstorms and strong gusty winds while Isaac moves over the waters south of Jamaica.
Meanwhile, emergency response agencies are on alert as the island braces for the possible effects of the tropical cyclone expected to pass south of Jamaica over the weekend.
Desmond Mckenzie, Minister of Local Government and Community Development, made the disclosure Thursday while speaking at a special sitting of the Trelawny Municipal Corporation.
Mr. Mckenzie said shelters will be activated, if necessary.
He also urged councillors to keep a close watch on flood-prone areas in their divisions.
Mr. Mckenzie announced that $115 million will be made available to municipal corporations to carry out emergency drain cleaning over the next few days.