Active Season Ahead: NOAA’s updated Atlantic hurricane season forecast

The Weather Authority

The Atlantic Hurricane Season went silent after Hurricane Elsa in early July, but that quiet period likely comes to an end soon.


NOAA GOES-East satellite image of Hurricane Elsa as it moves up Florida’s west coast on July 6, 2021. (NOAA)

NOAA’s latest Atlantic Hurricane Season Outlook (released on August 4th) outlines what could be a substantial ‘upswing’ in tropical cyclone development in the Atlantic basin through the rest of the season.

“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). This updated outlook includes the 5 named storms that have formed so far, with Hurricane Elsa becoming the earliest 5th named storm on record.”

NOAA’s August 4th update

A record setting season so far…

Hurricane Elsa developed early for an ‘E’ storm: the earliest fifth storm on record.

The five storms thus far (Ana, Bill, Claudette, Danny and Elsa) already produced above-average ‘Accumulated Cyclone Energy’ in the Atlantic.

As of this writing on August 4th, the global ‘drivers’ are lining up in such a way to expect a sharp increase in tropical storm or hurricane development over the next 4-6 weeks: right in line with ‘normal’ expectations around the peak of hurricane season.

What does this mean for Alabama and the nearby Gulf Coast?

In short: it means nothing specifically, yet.

Last year, Hurricane Sally made a direct hit on Baldwin County: landfall at Gulf Shores at 4:45 AM on September 16th (almost exactly 16 years after Category Three Hurricane Ivan hit the exact same spot).

Hurricane Zeta, a Category Three at landfall in Louisiana hit Alabama hard as the storm’s core moved northeast across the state.

Climatology tells us the return period for a hurricane is around nine to eleven years on the Alabama, Mississippi and Northwest Florida Gulf Coast.

Return period for a hurricane (wind greater than 74 MPH)

The return period for a major hurricane is longer: between two and three decades.

So while the law of averages tells us the odds are against a repeat of a Sally, Zeta – or even an Ivan or Katrina – in the 2021 season, we have to remember that averages are the middle of extremes.

For example, the return period on a hurricane near Lake Charles, Louisiana is 14 years. Hurricane Laura hit as a strong Category Four last August; Hurricane Delta came into the same area forty-one days later.

The lesson here? ‘Normal’ isn’t always reality.

Looking for the rest of the forecast? It’s always online at WHNT.com/Weather and in the “Daily Forecast” section on Live Alert 19!

-Jason
Connect with me!
Facebook
Twitter (@simpsonwhnt)

Copyright 2021 Nexstar Media Inc. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Click Here To Send Us Your Photo