Category 3 Hurricane Isaias closes in on the Florida Panhandle » Yale Climate Connections

by Irene Sans, Jeff Masters and Bob Henson, Yale Climate Connections
October 9, 2026

Preparations for the imminent arrival of Hurricane Isaias need to be rushed to completion along the Florida Panhandle and Alabama coast as the intensifying major hurricane closes in for a Friday-night landfall. Although significant weakening is expected in the few hours before landfall or shortly thereafter, such weakening may well come too late to limit wind damage, and a very damaging storm surge will occur regardless of any final-hours weakening. Isaias is also expected to bring significant flash flooding and a dangerous tornado outbreak, regardless of its landfall intensity.

At 2 p.m. EDT Friday, Isaias was located about 145 miles (235 km) south of Pensacola, Florida, headed north-northeast at 16 mph (26 km/h), with maximum sustained winds of 120 mph (195 km/h) and a central pressure of 959 mb. Wind shear was high (30-35 knots), and sea surface temperatures (SSTs) were record-warm, near 30 degrees Celsius (86 degrees Fahrenheit). On Friday morning, Isaias was passing over a Loop Current eddy in the Gulf with very warm waters that extended to great depth. This reservoir of heat energy was helping the hurricane intensify and resist the high wind shear besetting it. At 4:15 a.m. EDT Friday, Isaias brought sustained winds of 70 mph, gusting to 74 mph, to the Mississippi Canyon Rig offshore oil platform (at an altitude of 427 feet). As of 2 p.m. EDT Friday, the peak storm surge was 3.4 feet, observed in southeastern Louisiana at Shell Beach. The surge was causing moderate flooding there and was still rising.

Isaias was embedded in an increasingly dry atmosphere, with mid-level relative humidity at 50%. Satellite images from Friday afternoon and Hurricane Hunters data showed that Isaias was maintaining its intensity despite the dry air and wind shear. Isaias was upgraded to a Cat 3 on Friday morning, becoming the first major hurricane of the 2026 Atlantic hurricane season.

Major Atlantic hurricanes during a strong El Niño: a rare breed

Isaias has joined a rare cadre of Atlantic storms that became major hurricanes during strong El Niño conditions. Since records of NOAA’s Relative El Niño Index (RONI) began in 1950, only four years have seen “strong” El Niño conditions (defined as the RONI index reaching 1.5°C or higher) during July-August-September: 1965, 1997, 2015, and now 2026. Those years saw only four major hurricanes in the Atlantic, one per year, compared with the three major hurricanes expected in a typical Atlantic season based on 1991-2020 climatology.

Betsy 1965: Cat 4, 130 mph. Made landfall as a Cat 3 in the Florida Keys and Cat 4 in Louisiana.
Erika, 1997: Cat 3, 125 mph winds. No landfall.
Danny, 2015: Cat 3, 125 mph. No landfall.
Joaquin, 2015: Cat 4, 140 mph. Made a Cat 4 landfall in the Bahamas, and as a tropical storm in the Leeward Islands.
Isaias, 2026: Cat 3 so far. Landfall TBD.

Forecast for Isaias: A major hurricane threat to the central U.S. Gulf Coast

Hurricane Isaias will continue tracking mainly north as it approaches the central Gulf Coast of the United States. The system is expected to reach the western Florida Panhandle coast on Friday evening and could make landfall as a major Category 3 hurricane, or perhaps at Cat 2 strength depending on how quickly the expected weakening occurs.

The Air Force Reserve Hurricane Hunters confirmed surface winds of 120 mph (195 km/h) and a central pressure of 959 mb in Isaias on Friday morning. The strong wind shear we have been mentioning for the past four days has increased along the storm’s southwestern side. Up to now, this shear has been configured in a way that increases ventilation at the storm top, which can actually boost strengthening. An even stronger and more destructive shear pattern will likely begin affecting the storm late Friday afternoon, making it increasingly lopsided as it continues northward toward the Gulf Coast. Nevertheless, all forecasts suggest Isaias will likely remain a significant hurricane until landfall, potentially hitting as a Category 3 hurricane Friday evening.

After landfall, Isaias will begin to weaken in terms of maximum sustained winds. However, the hurricane will continue to produce several other hazards, including flash flooding, gusty winds, severe thunderstorms within its rainbands, with numerous tornadoes also possible (see below). These threats could persist well into Saturday morning, even after Isaias moves inland across the southeastern United States.

Strongest impacts and severe weather threat

Isaias is a particularly interesting storm because wind shear will make the system even more asymmetrical, concentrating much (more than usual) of its strongest weather on the right, or eastern, side of the storm. This means most convection, including the strongest thunderstorms, will affect parts of the Florida Panhandle, southern Alabama, and southwestern Georgia. The most significant storm surge is also expected along the Florida Panhandle and into the Big Bend region.

Areas west of the storm’s center could experience a negative storm surge, sometimes called a setdown, as offshore winds push water away from the coastline. This could temporarily lower water levels below normal. However, these conditions can change rapidly as the storm moves inland and wind directions shift.

As with any landfalling Atlantic hurricane, wind damage will be most severe in the eyewall on the right side of landfall. Isaias’s rapid forward speed will still carry damaging winds well inland. As Michael Lowry noted in his latest Substack post, as Isaias moves inland, it will transition into a much larger extratropical storm, and its expanding wind field will bring strong, long-duration gusty winds across the southeastern U.S., into the lower Tennessee Valley and southern Appalachians, this weekend. This will likely cause widespread downed trees and power outages throughout the region, with winds gusting over 60 mph, especially over inland Alabama on Saturday and across the mountains of North Georgia, eastern Tennessee, and western North Carolina.

Tornado threat: Friday afternoon through Saturday

The strongest winds will occur near and just to the right of the storm’s center. However, as the wind field expands and the system moves northward (eastern expansion is more likely due to wind shear), the tornado risk will increase across portions of the Florida Panhandle, southern Alabama, and southwestern Georgia. Near the surface, winds will generally blow from south to north across these areas. However, higher in the atmosphere, winds will predominantly come from the west-southwest. This change in wind direction and speed with height will create favorable conditions for rotation within some supercell thunderstorms that develop in Isaias’s rainbands.

Tornado-producing thunderstorms will become increasingly likely as Isaias approaches the coast and moves inland Friday evening into early Saturday morning. The tornado threat will likely continue through the first half of Saturday afternoon as the storm moves farther inland over Alabama. However, the threat will also persist across portions of the Florida Panhandle and Georgia.

Much of the Florida Panhandle, southern Georgia, and southeastern Alabama will likely be placed under a tornado watch this evening. (A tornado watch means that atmospheric conditions are favorable for tornadoes to develop. A tornado warning means radar has detected a tornado or a developing tornado, or someone has observed a tornado visually.)

Tornado risk will increase across the Florida Panhandle beginning Friday afternoon, then spread northward into southeastern Alabama and southwestern Georgia during the evening. According to the Storm Prediction Center, most of the stronger tornadoes are expected to be in the EF1 range (85-110 mph). Keep in mind that hurricane-induced outbreaks sometimes include a few stronger twisters as well. Two years ago, on October 8–9, 2024, a swarm of 46 tornadoes struck Florida south of the track of Hurricane Milton, including three that reached EF3 strength. Three other tropical cyclones that year helped generate at least one EF3-strength U.S. twister.

Heavy rainfall and flash flooding

Rainfall totals will likely be substantial across the Interstate 10 corridor, from the Tallahassee area westward toward Mobile, Alabama. The Weather Prediction Center has issued a Moderate Risk (level 4 out of 5) of excessive rainfall, indicating at least a 40% chance of flash flooding occurring within 25 miles of any given point. This risk covers much of the Florida Panhandle, extreme southwestern Georgia, and southern Alabama, particularly areas just east of Mobile. The rest of the Southeast will remain under a Slight Risk (level 3 out of 5) of excessive rainfall, meaning at least a 15% chance of flash flooding within 25 miles of any given point. The flash flood threat will continue through Monday morning as the storm pushes farther inland. Between 2 and 4 inches of rain are possible, with some isolated amounts up to 5 inches across the Southeast. The forecast calls for up to 15 inches of rain along the Florida Panhandle, southern Alabama, and southwestern Georgia.

Storm surge threat along the Florida Panhandle

As Isaias approaches land, significant storm surge is expected to affect the Florida Panhandle, particularly from Indian Pass westward to the Alabama–Florida border, beginning Friday afternoon and continuing through Friday evening. (Storm surge is the abnormal rise in seawater generated by a storm’s winds pushing water toward the coast; storm tide is the total water level from the combination of storm surge and the astronomical tide.)

Storm surge inundation is forecast to reach 6-9 feet above normally dry ground from the Alabama–Florida border eastward to Grayton Beach, Florida. Farther east, from Indian Pass through portions of the Florida Big Bend, storm surge inundation could reach 4-6 feet, with water levels potentially approaching five feet in some parts of the Big Bend region.

Keep in mind that the deepest water will generally occur along the immediate coastline and in low-lying areas where strong onshore winds push seawater inland.

Florida Panhandle/Alabama hurricane history

Since 2000, the Florida Panhandle/Alabama coast has suffered four hurricane landfalls (Fig. 5): one Cat 5 (Michael, 2018), two Cat 3s (Ivan, 2004 and Dennis, 2005) and one Cat 2 (Sally, 2020). The closest analog storm to Isaias’s coming landfall may well be Hurricane Sally, which hit Gulf Shores, Alabama, as a high-end Category 2 hurricane with 110 mph winds on Sep. 16, 2020. Wind gusts up to 100 mph and 20-30 inches of rainfall caused considerable flood and wind damage across Alabama, the Florida Panhandle, and into Georgia. Storm surge and heavy rainfall flooded many homes and businesses in downtown Pensacola, FL. Sally caused $9.3 billion in damage (2026 USD) and killed five. Sally is the costliest hurricane whose name has not been retired.

Rachel is likely to bring coastal flooding, heavy rains, and damaging wind gusts to Baja and the Southwest U.S.

On almost any other day this hurricane season, Tropical Storm Rachel in the eastern Pacific would have been the big story for the U.S., as a Tropical Storm Watch is up from the U.S./Mexico border to the San Diego-Orange County line, including San Diego, for the expected arrival of Rachel on Saturday night. This is only the second time a Tropical Storm Watch has ever been issued for any part of California. The only other one was on August 20, 2023, for Tropical Storm Hilary, which caused $900 million in U.S. damages. The simultaneous Tropical Storm Watch on the West Coast for Tropical Storm Rachel and the Hurricane Warning for Isaias on the Atlantic coast marks the first time NHC has ever issued watches/warnings simultaneously for both coasts.

Rachel had weakened to a 50-mph (85 km/h) tropical storm as of 11 a.m. EDT Friday, but has now turned northeast and is moving toward the California/Mexico border region. The combination of record-warm sea surface temperatures and atmospheric dynamics from the strong upper-level trough of low pressure along the West Coast will likely allow Rachel to remain a tropical storm until it makes landfall late Saturday, despite very dry air present at mid-levels of the atmosphere. In fact, as noted by Daniel Swain (see Bluesky post below), Rachel is actually expected to restrengthen into a strong tropical storm, with NHC predicting sustained winds around 65 mph at landfall because of the interaction with the upper-level trough.

Ocean temperatures of the coastal waters Rachel will be traversing are 5.5-7 degrees Celsius (10-13°F) above average — an astonishing and record-breaking anomaly — made possible by a combination of an extremely strong El Niño acting to reinforce a severe pre-existing marine heatwave amplified by climate change.

As explained by Daniel Swain, the European model ensemble now indicates about a 50% chance of wind gusts over 50mph in San Diego. Rachel’s strong winds could even cause a brief period of elevated-critical fire weather in the San Diego County mountains, as strong (offshore) winds may initially arrive prior to wetting rainfall along with some rain shadowing, and fuels are dry following recent record heat.

Coastal flooding is also a huge concern with the storm, as water levels are currently running about 18 inches higher than usual because of their record warmth. Damaging waves from Rachel have already caused coastal damage in southern California, and NHC is warning of the danger of moderate coastal flooding, with isolated major flooding.

Hurricane Simon predicted to reach Mexico’s Jalisco coast this weekend as a Cat 4 powerhouse

Residents across coastal Jalisco state in Mexico, including those in and around Puerto Vallarta, need to prepare now for strengthening Hurricane Simon. Already packing top sustained winds of 100 mph as of 11 a.m. EDT Friday, Simon is projected to rapidly intensify into a Category 4 hurricane by Saturday, and it would not be a shock to see Simon approaching Cat 5 strength. Much like Isaias, Simon is developing a compact inner core that can respond quickly to a very favorable environment. Wind shear will be light, mid-level relative humidity is quite high (around 75%), and Simon is traversing sea surface temperatures of around 30°C (86°F). This is more than warm enough to allow for rapid growth, even after the cool upwelling fostered by other recent Pacific hurricanes passing through the region.

The biggest forecast challenge with Simon is the angle at which it’s approaching the coast. Whereas Isaias is moving perpendicular to the Gulf coast, Simon is moving at a near-parallel angle to the Jalisco coast. As a result, only a slight eastward shift in Simon’s northward track could bring the center fully inland at close to peak strength, followed by rapid weakening. A slight westward shift could lead to a coast-scraping track near or just offshore, which would lead to more gradual weakening while inflicting hurricane conditions on an extended stretch of coastline all the way to Puerto Vallarta.

Regardless of the fine-scale details of the eventual track – which will be impossible to predict with razor-sharp certainty – residents should prepare for hurricane conditions to slam parts of northern Jalisco, including destructive winds and power outages. Areas farther southeast may experience major impacts as well, including torrential rains bringing the risk of life-threatening flash floods and mudslides. The NOAA/NWS Weather Prediction Center projected that the highest rainfall totals, perhaps in the range of 20-30 in (500-750 mm), could occur in a pocket along the central Michoacan coast. More widespread totals of 12-16 in (300-400 mm) can be expected along the northern Jalisco coast, perhaps up to Puerto Vallarta, and 6-12 in (150-300 mm) will likely fall well inland in both states as well as in coastal Nayarit state. The storm surge threat may be tempered somewhat by the angle of Simon’s approach, but huge surf and high swells will be another major threat.

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