Tropical weather waxes and wanes
( CNN ) -- A second tropical storm emerged as a tropical depression formed and another dissipated Saturday morning, the National Hurricane Center said.
Tropical Storm Melissa, the 13th named storm of the season, carried 40 mph (65 kph) winds as it moved to the west near 3 mph (6 kph) around 5 a.m. ET, in the middle Atlantic, far from inhabited land, the hurricane center said.
Tropical Storm Karen also had 40 mph (65 kph) winds but was weakening, forecasters said. It was 590 miles (950 kilomters) east of the Windward Islands and was moving to the west-northwest near 12 mph (19 kph). It is likely to weaken into a tropical depression soon, forecasters said.
Tropical Depression 14-E formed a few hundred miles off the west coast of Mexico with winds of 35 mph (56 kph) and was moving away from North America.
Tropical Depression Lorenzo, the only one of the four systems to affect land, was expected to drop 4 to 7 inches of rain on Mexico during the day Saturday before dissipating overnight, according to the NHC. Its winds had diminished to 25 mph (35 kph), though at landfall Friday it was a hurricane with 80-mph winds.