With five named storms on the books already this year, forecasters are continuing to call for an above-average Atlantic hurricane season as conditions remain ripe for storm development.
“After a record-setting start, the 2021 Atlantic hurricane season does not show any signs of relenting as it enters the peak months ahead,” said Rick Spinrad, Ph.D., NOAA administrator, in releasing the agencies annual mid-season update. “NOAA will continue to provide the science and services that are foundational to keeping communities prepared for any threatening storm.”
The latest outlook reflects that the number of expected named storms (winds of 39 mph or greater) is 15-21, including 7-10 hurricanes (winds of 74 mph or greater), of which 3-5 could become major hurricanes (Category 3, 4, or 5 with winds 111 mph or greater). The updated outlook includes the 5 named storms that have formed so far, with Hurricane Elsa becoming the earliest 5th named storm on record.
NOAA scientists predict that the likelihood of an above-normal 2021 Atlantic hurricane season is 65%. There is a 25% chance of a near-normal season and a 10% chance of a below-normal season.
“A mix of competing oceanic and atmospheric conditions generally favor above-average activity for the remainder of the Atlantic hurricane season, including the potential return of La Nina in the months ahead,” said Matthew Rosencrans, lead seasonal hurricane forecaster at NOAA’s Climate Prediction Center.
Atlantic sea surface temperatures are not expected to be as warm as they were during last year’s record-breaking season, however, reduced vertical wind shear and an enhanced west Africa monsoon all contribute to the current conditions that can increase seasonal hurricane activity, says NOAA. These conditions are set against the backdrop of the ongoing warm phase of the Atlantic Multi-Decadal Oscillation, which has been favoring more active hurricane seasons since 1995.
NOAA’s update to the 2021 outlook covers the entire six-month hurricane season, which ends November 30, 2021.
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