Nana expected to weaken as it moves across Atlantic
NEW: Nana expected to weaken to a tropical depression Monday
NEW: Nana's center is about 980 miles west of Cape Verde Islands Sunday night
Storm moving west-northwest near 8 mph; maximum sustained winds near 40 mph
(CNN) -- Tropical Storm Nana is expected to weaken after forming over the eastern Atlantic Sunday, the National Hurricane Center said Sunday.
Tropical Storm Nana is expected to weaken to a tropical depression by Monday.
At 11 p.m. ET, Nana's center was about 980 miles (1,580 kilometers) west of the Cape Verde Islands with maximum sustained winds near 40 mph.
The storm was expected to continue moving west-northwest near 8 mph for the next day or two as it loses strength.
"Nana is expected to weaken to a tropical depression Monday," the NHC said in its most recent advisory
A tropical storm has maximum sustained surface wind speeds from 39 mph to 73 mph. A tropical depression has maximum sustained surface wind speeds of 38 mph or less.
Elsewhere, tropical depression Odile degenerated to a remnant low about 20 miles southwest of Manzanillo, Mexico, the NHC said.
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Weakening Norbert dumps rain on Mexico, U.S.
Odile could still produce one to two inches of rain over portions of southern Mexico, even though it is expected to dissipate in the next day or so, the NHC said.
Earlier Sunday, tropical depression Norbert dissipated over the mountains of northern Mexico, the NHC said, after wreaking havoc in the southern Baja California peninsula on Saturday and dumping rain on mainland Mexico's Sonora coast early Sunday.
Norbert made landfall as a Category 2 storm near Puerto Charley on Baja's southwest coast Saturday, tearing off roofs and forcing hundreds of people to flee flooded homes.
The NHC predicted that remnants of Norbert could produce one to three inches of rain over portions of the southern high plains in the United States through Sunday night.
