Tropical Storm Erin has formed on a path toward the Caribbean and is expected to strengthen to a hurricane later in the week as it passes by Puerto Rico. Most models forecast the storm turning upward into the Atlantic Ocean, but a few see the storm continuing onward to the U.S. mainland.

The National Hurricane Center says Tropical Storm Erin is making its way west across the Atlantic Ocean – but with the storm still thousands of miles from the U.S. coast, FOX 13 meteorologists say it's still too soon to pinpoint its eventual path.

Erin was a tropical storm in the North Atlantic Ocean late Monday Eastern time, the National Hurricane Center said in its latest advisory.