For the North Atlantic...Caribbean Sea and the Gulf of Mexico: The National Hurricane Center is issuing advisories on Hurricane Humberto, located less than 700 miles west-southwest of Bermuda. 1. A small low pressure system located about 1200 miles east of the Lesser Antilles continues to produce disorganized showers and thunderstorms. Environmental conditions are expected to be conducive for the formation of a tropical depression during the next day or so while the system moves slowly northwestward to west-northwestward. * Formation chance through 48 hours...high...70 percent. * Formation chance through 5 days...high...90 percent.