Published: Sep 14, 2010 9:57 PM EDT
Updated: Sep 14, 2010 6:57 PM EDT

MIAMI (AP) - Tropical Storm Karl has formed formed in the Gulf of Mexico, heading on a path that's expected to take it over the Yucatan Peninsula.

Forecasters say the storm has maximum sustained winds of about 40 mph (65 kph) and is located about 270 miles (435 kph) east of Chetumal, Mexico. It's moving west-northwest at 15 mph (24 kph).

Mexico's government has issued a tropical storm warning for the peninsula from Chetumal northward to Cabo Catoche. Parts of Belize are under a tropical storm watch.