On Thursday, scientists at NOAA’s Climate Prediction Center increased their prediction for the ongoing 2023 Atlantic hurricane season from a near-average season to one that's expected to be more active than normal.
Forecasters believe that current ocean and atmospheric conditions, such as record-warm Atlantic sea surface temperatures, are likely to counterbalance the usually limiting atmospheric conditions associated with the ongoing El Nino event.
NOAA forecasters have increased the likelihood of an above-normal Atlantic hurricane season to 60% (increased from the outlook issued in May, which predicted a 30% chance). The likelihood of near-normal activity has decreased to 25%, down from the 40% chances outlined in May's outlook. This new update gives the Atlantic a 15% chance of seeing a below-normal season.
NOAA’s update to the 2023 outlook now calls for 14-21 named storms (winds of 39 mph or greater), of which 6-11 could become hurricanes (winds of 74 mph or greater). Of those, 2-5 could become major hurricanes (winds of 111 mph or greater).
NOAA provides these ranges with 70% confidence. These updated ranges include five storms that have already formed this season.
El Nino conditions are currently being observed and there is a greater than 95% chance that El Nino will continue through the Northern Hemisphere winter, according to thelatest ENSO discussion from the Climate Prediction Center. El Nino usually results in atmospheric conditions that help to lessen tropical activity during the Atlantic hurricane season. So far, those limiting conditions have been slow to develop and climate scientists are forecasting that the associated impacts that tend to limit tropical cyclone activity may not be in place for much of the remaining hurricane season.
A below-normal wind shear forecast, slightly below-normal Atlantic trade winds and a near- or above-normal West African Monsoon were also key factors in shaping this updated seasonal forecast.
The Atlantic basin experienced an active start to the hurricane season with five storms that have reached at least tropical storm strength, including one hurricane already.
