The Atlantic hurricane season ended Nov. 30 with a record-breaking 30 named storms. Thirteen of the storms became hurricanes, including six major hurricanes with winds greater than 111 mph. This is the fifth consecutive year with an above-average season. According to NOAA, this is due to a warm Atlantic sea surface and a stronger west African monsoon. Weak vertical wind shear combined with La Nina also made this extremely active hurricane season possible.