Tropical Storm Isaac is on its way

By Frank Lenzi Published: Aug 24, 2012 at 7:47 AM PDT Last Updated: Aug 27, 2012 at 11:51 AM PDT
Tropical Storm Isaac is on its way
This NOAA satellite image taken Thursday, August 23, 2012 at 01:45 PM EDT shows Tropical Storm Isaac is now located about 165 miles south of San Juan, Puerto Rico. (AP PHOTO/WEATHER UNDERGROUND)

Tropical Storm Isaac will cross Haiti and the Dominican Republic today and Cuba tomorrow.

ABC'S Aaron Katersky is in Tampa, Florida, where the Republican National Convention begins next week. He tells us the organizers are keeping a close eye out for the hurricane.