System in gulf may be 'spawn of Isaac'

You thought you had seen the last of Tropical Storm Isaac here? Not quite.

Meteorologists are keeping an eye on an area of low pressure in the Gulf of Mexico that may develop into a tropical system -- and we have Isaac, in part, to blame.

Right now, it's just a blob of clouds in the northern Gulf of Mexico. But the National Hurricane Center is giving the system -- dubbed Invest 90L for now -- a 40-percent chance of developing tropical characteristics in the next two days.

FOX 13 meteorologist Andy Johnson went back through the last few days' worth of national weather maps to explain how this system has its origins in Isaac, which brushed the Bay Area as a tropical storm and came ashore in Louisiana as a hurricane last week.

"If you tracked the center of low pressure connected with Isaac, Invest 90L would not be directly related," Andy explained in a detailed blog entry. "However, if you consider that the original moisture and thunderstorm complex associated with Invest 90L had its origins in Isaac, a case could be made that 90L had its origins with Isaac."

Either way, Invest 90L will probably mean increased rain chances for the Bay Area over the next few days.

"Eventually, the low is forecast to move northeast across the Florida Peninsula ahead of an approaching cold front over the weekend," Andy added.