According the the National Hurricane Center, Tropical Storm Flossie could strengthen into a hurricane as early as Monday.

Tropical Storm Flossie has strengthened off Mexico's southwestern Pacific coast. The weather system reached maximum sustained winds of 65 mph on Monday, moving northwest and is centered about 170 miles southwest of Zihuatanejo.

Unrelated to the tropical storms, much of the U.S. Midwest and East faced rounds of severe thunderstorms packing strong winds and hail and raising flooding concerns Sunday and Monday. AccuWeather meteorologists said hot and humid air will clash with an advancing cool air boundary into early week causing thunderstorms to erupt, some of them severe.