Tropical Storm Hanna strengthened slightly Friday as it moves toward the Texas coastline, threatening to bring heavy rain, rough waters and strong winds, all while another tropical storm continued to approach the Caribbean.
While the heat index is an effective tool for measuring what it feels like outside, it does not factor in sunlight, which is crucial for mid- and lower-latitudes.
The National Hurricane Center in Miami says Tropical Storm Gonzalo has formed the middle of the Atlantic Ocean. This sets a record for the earliest named seventh tropical storm of the Atlantic hurricane season.
The world could see annual global temperatures pass a key threshold for the first time in the coming five years, the U.N. weather agency said Thursday.