A hur­ri­cane warn­ing was issued Sun­day for Puer­to Rico and the north­ern Coast of the Domini­can Repub­lic as Trop­i­cal Storm Irene dumped heavy rain in the Caribbean.

The storm could hit south­ern Flori­da by the end of the week.

Fore­cast­ers at the U.S. Nation­al Hur­ri­cane Cen­ter in Mia­mi said Irene could become a hur­ri­cane by Mon­day. On Sun­day, the storm had max­i­mum sus­tained winds of 50 mph (80 kph) and was mov­ing west-north­west at 20 mph (32 kph). Sus­tained winds must reach 74 mph (119 kph) for the storm to become a hurricane.

The warn­ing in the Domini­can Repub­lic stretch­es from its bor­der with Haiti in the south to Cabo Frances Viejo on the north coast.

Mean­while, a hur­ri­cane watch has been issued for the U.S. Vir­gin Islands. A trop­i­cal storm warn­ing is in effect for Haiti, the U.S. Vir­gin Islands and oth­er islands.

Irene was 235 miles (378 kilo­me­ters) east-south­east of Ponce, Puer­to Rico. It was expect­ed to pass near Puer­to Rico some­time late Sun­day or ear­ly Monday.

Trop­i­cal storm warn­ings have been issued for the U.S. Vir­gin islands as well as a host of near­by islands.

Irene could bring dan­ger­ous storm surge to the coasts of Puer­to Rico and the Domini­can Republic.

Also Sun­day, Har­vey trekked west­ward across south­east­ern Mex­i­co with heavy rains. Recent­ly down­grad­ed to a trop­i­cal depres­sion, Har­vey was locat­ed at about 125 miles (201 kilo­me­ters) east-south­east of Coatza­coal­cos, Mexico.