Frederic, Ivan, Sally, Opal and Zeta: What Alabama Hurricane History Says About Isaias

MOBILE, Ala. — Hurricane Isaias is bearing down on a coastline that knows hurricanes well. From the catastrophic surge of Frederic in 1979 to the slow-moving deluge of Sally in 2020, Alabama hurricane history offers a set of hard-earned lessons about what a storm like Isaias can do, both on the beaches and hundreds of miles inland.

No past storm is a perfect match. But forecasters and emergency managers often point to earlier hurricanes to help residents understand the range of threats in a forecast, and Isaias carries several of them at once: damaging wind, life-threatening storm surge in Mobile Bay, flooding rain and the possibility of tornadoes well away from the coast.

Where Isaias stands

Isaias strengthened into a Category 2 hurricane over the Gulf on Thursday, Oct. 8. As of the National Hurricane Center’s 4 p.m. advisory, it had maximum sustained winds of 100 mph and a minimum central pressure of 975 millibars, and it was moving northeast at about 12 mph. Forecasters expected additional strengthening overnight before the storm turns north toward the northern Gulf Coast, with landfall expected late Friday or early Saturday. Hurricane and storm surge warnings are in effect for coastal Alabama.

On the Saffir-Simpson Hurricane Wind Scale, a Category 2 storm has sustained winds of 96 to 110 mph, and storms of Category 3 or higher are considered major hurricanes. The scale measures wind only, however. Storm surge, rainfall flooding and tornadoes can be deadly regardless of a storm’s category, which is one reason the history below matters.

The hurricane center has forecast 5 to 7 feet of potential storm surge in Mobile Bay. After landfall, Isaias is expected to move quickly north and may expand its wind field as it interacts with another weather system. The National Weather Service office in Birmingham is forecasting wind gusts of 40 to 50 mph across parts of Central Alabama, 2 to 4 inches of rain with locally higher amounts, possible flash flooding, and the chance of isolated tornadoes Saturday.

Isaias is also something of a historical oddity in its own right. It is the first hurricane of the 2026 Atlantic season, and it formed just one day short of tying the record for the latest date the season’s first hurricane has developed, a mark set on Oct. 8, 1905.

Five Alabama storms in particular help put the forecast in context.

Frederic and Ivan: the power of a major hurricane on the coast

Hurricane Frederic (1979). For many longtime residents of Mobile and Baldwin counties, Frederic remains the benchmark. The storm made landfall on Sept. 12, 1979, as a Category 4 hurricane, and the National Weather Service in Mobile reports that its center crossed the western end of Dauphin Island before driving devastating winds and surge into the Mobile Bay region.

Wind gusts reached 100 to 145 mph in parts of the area. Surge reached 12 to 15 feet along the Gulf beaches and 8 to 10 feet in northern Mobile Bay. Fallen trees blocked roads and brought down thousands of power lines, and some Mobile County communities were without electricity for as long as five weeks. Frederic then moved north along the Alabama-Mississippi line, causing more wind damage inland.

Frederic was considerably stronger than Isaias is forecast to be. Its relevance is geographic: it shows how vulnerable the communities ringing Mobile Bay are when a hurricane’s surge is funneled up the bay, and why the current surge forecast of 5 to 7 feet is being taken seriously even though it is well below Frederic’s levels.

Hurricane Ivan (2004). Ivan came ashore just west of Gulf Shores on Sept. 16, 2004, as a Category 3 hurricane with maximum sustained winds of 120 mph. The weather service in Mobile documented extensive destruction across Baldwin County and the western Florida Panhandle, where a historic storm surge and destructive winds damaged homes, businesses and coastal infrastructure.

Ivan’s damage did not stop at the beach. It knocked down trees and power lines across a wide area as it moved inland. Like Frederic, Ivan was stronger than Isaias is expected to be at landfall, but it remains a vivid reminder of how exposed Alabama’s barrier islands and beach communities are to wind and water.

Sally: the danger of a slow storm

Hurricane Sally (2020). Sally made landfall near Gulf Shores on Sept. 16, 2020, 16 years to the day after Ivan, as a Category 2 hurricane with maximum sustained winds of 105 mph. That makes it, on paper, the closest match to Isaias’s current intensity.

What set Sally apart was its crawl. According to the weather service in Mobile, Sally was moving at less than 5 mph when it reached the coast. That slow pace dragged out hurricane-force winds, surge and torrential rain over coastal Alabama and the western Florida Panhandle. Some locations recorded more than 20 inches of rain, and surge reached 7 to 9 feet above ground level in parts of southeastern Baldwin County and nearby bays and sounds. Thousands of coastal structures flooded as surge combined with the extraordinary rainfall.

Isaias is expected to behave very differently. Forecasters say it will accelerate as it approaches land, which could shorten the period of heavy rain compared with Sally. That same faster motion, however, could carry stronger winds farther inland. Sally’s rainfall totals should not be read as a forecast for Isaias, but its flooding remains a lesson in how quickly water can become the deadliest part of a hurricane.

Opal and Zeta: when the wind travels inland

Hurricane Opal (1995). Opal made landfall near Pensacola Beach on Oct. 4, 1995, as a Category 3 hurricane and then raced north-northeast across Alabama. The weather service in Birmingham reports that Opal caused damage in virtually every county in the state.

Its winds toppled trees and power lines and damaged buildings, leaving about 2.6 million people in Alabama without electricity, some for more than a week. Gusts reached 48 mph in Birmingham, 49 mph in Calera, 46 mph in Tuscaloosa and 63 mph at Montgomery’s Dannelly Field. Opal also produced nine short-lived tornadoes, mostly near and east of its center.

Opal may be one of the most useful comparisons for Isaias’s inland impacts. The 40 to 50 mph gusts now forecast for Central Alabama are in the same range as several of the gusts recorded during Opal, and Opal showed how a fast-moving storm can cause problems far from where it came ashore. That does not mean Isaias will repeat Opal’s statewide damage; the eventual track, wind field and intensity will determine that.

Hurricane Zeta (2020). Zeta made landfall in southeastern Louisiana on Oct. 28, 2020, then raced northeast into Alabama. Despite increasing wind shear and less favorable conditions, its rapid forward speed allowed it to keep considerable strength as it crossed the state.

The weather service in Birmingham reported widespread gusts of 40 to 50 mph, with some locations seeing gusts of 50 to 70 mph. The wind brought down trees and power lines across southwestern, south-central and east-central Alabama, and Alabama Power documented at least 494,000 outages statewide. Rainfall generally ranged from 2 to 5 inches. No tornadoes were documented with Zeta in Central Alabama; the wind did the damage.

Like Zeta, Isaias is expected to speed up as it moves inland and interacts with another weather system. The forecast gusts for Central Alabama are similar to what Zeta produced, which is why forecasters warn that a weakening storm can still cause substantial damage far from the Gulf.

What history tells us, and what it doesn’t

Taken together, the five storms illustrate different hazards. Frederic and Ivan showed what a powerful hurricane can do to the Alabama coast. Sally showed the destructive potential of prolonged rain and coastal flooding. Opal and Zeta showed that a hurricane does not need to stay at hurricane strength to cause widespread damage well inland.

The point of the comparison is not that Isaias will become another Frederic, Ivan, Sally, Opal or Zeta. It is that Alabama has already experienced each of the hazards now in the forecast. A shift in the track could change which communities see the strongest winds, the heaviest rain or the greatest tornado risk, and forecasters caution against focusing on the exact centerline of the forecast.

For residents along the coast, the main concerns are dangerous wind, storm surge and flooding. Farther inland, downed trees, power outages, heavy rain and possible tornadoes could become the primary threats. Emergency managers have urged people across southwest Alabama to finish preparations before conditions deteriorate Friday:

• Know whether you live in a storm surge evacuation zone, and follow any evacuation orders from local officials.
• Prepare for extended power outages with water, nonperishable food, medications, flashlights, batteries and charged phones.
• Secure outdoor furniture and other loose items that can become projectiles.
• Have more than one way to receive warnings, including phone alerts and a NOAA Weather Radio, especially for tornado warnings overnight.
• Never drive or walk through flooded roads, and run generators only outdoors, away from windows and doors.

The latest advisories are available from the National Hurricane Center at nhc.noaa.gov and from National Weather Service offices in Mobile and Birmingham at weather.gov. Local evacuation, shelter and closure information is available from the Mobile County and Baldwin County emergency management agencies.