Along with all the other unprecedented chaos experienced during 2020, the Atlantic hurricane season obliged with a record-setting campaign that featured 30 named storms, 13 of which turned into a hurricane. And six of those were of the major variety. So, what does 2021 hold? The season is already doling out its share of tropical punch. With that, Climatologist Phil Klotzbach and his Tropical Meteorology Project team at Colorado State University (CSU) have just upped the ante on their extended range forecast.
Back in April, the CSU researchers initially predicted another above-average Atlantic hurricane season with 17 named storms, eight of those to become hurricanes, and four to reach major hurricane strength. Their revised totals as of now stand at 20 named storms, nine to become hurricanes, and four of which to be major categories (3-5).
According to Klotzbach, the bump up in numbers is related to several factors playing out in the tropics. A portion of his latest report reads as follows: “Current neutral ENSO conditions are anticipated to persist for the next several months. Sea surface temperatures averaged across most of the tropical Atlantic are now near to slightly above normal, and most of the subtropical North Atlantic remains warmer than normal. Elsa’s development and intensification into a hurricane in the tropical Atlantic also typically portends an active season.”
The revised 2021 report also includes the probability of major hurricanes making landfall:
- 68% for the entire U.S. coastline (average for the last century is 52%)
- 43% for the U.S. East Coast including the Florida peninsula (average for the last century is 31%)
- 43% for the Gulf Coast from the Florida panhandle westward to Brownsville (average for the last century is 30%)
- 57% for the Caribbean (average for the last century is 42%)
The 2020 hurricane season had six landfalling Continental U.S. hurricanes, including Category 4 Hurricane Laura, which clobbered southwestern Louisiana.
The CSU team is scheduled to issue another hurricane season forecast update on August 5.