Tropical Storm Oscar expected to form soon; Nadine still going

A fifteenth tropical depression of the Atlantic hurricane season has formed in the middle of the ocean, but forecasters don't expect it to survive long.

The depression could become Tropical Storm Oscar over the next day or so. The forecast cone is taking it toward the northeast and the African coast, according to the National Hurricane Center.

But forecaster's initial public advisory on the storm says it isn't expected to last long. 

Tropical Storm Nadine is meanwhile moving northward and expected to become a post-tropical cyclone by Thursday or Friday. That would be for a second time, but the storm isn't expected to regenerate this time as it did a week ago. It is expected to swipe past the Azores for a second time, dropping a couple of inches of rain.

Nadine has been an active storm for 21 days and counting as of Wednesday. That ranks the storm as the fifth-longest-lived in the Atlantic since 1851, according to the Weather Underground's Jeff Masters.

The Atlantic hurricane season is on pace to be the quietest since 2009, when there were 11 named storms. But it is already busier than an average season, which sees a dozen named storms.

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