Hurricane Isaias and Southwest Florida: What to Expect

Everything forecast-related on this page is as of National Hurricane Center Advisory 4, issued at 11 AM EDT (10 AM CDT) Wednesday, October 7, plus the NWS Tampa Bay products out at that time. Several of those were written earlier in the morning, and each is labeled with its own time. This page was first written on the 5 AM advisory and has been updated. NHC's next full advisory is at 5 PM EDT, with an intermediate update at 2 PM, and the track has already shifted between packages, so check the time on this page against the clock. The live numbers are on our tropics tracker, which mirrors NHC and updates through the day.

This is not an official forecast. It is a local reading of the official one: what the NHC track usually means for Lemon Bay, Charlotte Harbor and the beaches from Venice to Fort Myers, and what to keep an eye on. For decisions about your home, your boat or your family, use NHC, NWS Tampa Bay and your county emergency management office.

What changed at 11 AM, and what didn't

For southwest Florida, not much. On the Advisory 4 track the center's closest approach to Englewood is about 340 miles, within 10 miles of where the 5 AM forecast had it. NHC nudged the track a little east again, but the shift shows up in where Isaias reaches the northern Gulf coast, not in how close it comes to us. Tampa, Venice, Punta Gorda and Fort Myers are still missing from NHC's wind probability table.

The big change is on the northern Gulf coast, where NHC issued the first watches for Isaias: a hurricane watch from Bay St. Louis, Mississippi, to Indian Pass, Florida; a storm surge watch from the mouth of the Mississippi River to Yankeetown, Florida; and tropical storm watches from the Jefferson/Plaquemines Parish line in Louisiana to west of Bay St. Louis, and from east of Indian Pass to the Aucilla River. None of them covers Sarasota, Charlotte or Lee counties. The nearest is the storm surge watch, which ends at Yankeetown in Levy County, about 145 miles north of Stump Pass.

NWS Tampa Bay's local statement for Isaias, issued at 11:23 AM, reads the same way from Ruskin. It puts coastal Levy County under the storm surge watch, with up to 4 feet of surge possible from the Suwannee River to Yankeetown, and flags the possibility of locally hazardous surge with limited impacts along the Citrus, Hernando and Pasco coasts. Elsewhere across west-central and southwest Florida it expects little to no surge impact, and it says there are currently no concerns about tropical-storm-force winds in its area.

If you have family, a boat or a camp on the Panhandle or the Alabama and Mississippi coast, our Pensacola-to-Mobile page covers the watch area in detail.

Where Isaias is and where NHC expects it to go

At 11 AM EDT Wednesday an Air Force Reserve Hurricane Hunter aircraft placed Isaias in the southwestern Gulf, about 260 miles west-northwest of Progreso, Mexico. Maximum sustained winds had increased to 45 mph, pressure had fallen to 1000 mb, and it was moving east-northeast at 8 mph. NHC's discussion says the center was re-forming a little to the north, closer to the storm's mid-level circulation, a change that could help it strengthen quickly.

NHC expects a turn to the northeast and then north on Thursday and Friday, with the storm picking up speed, passing north of the Yucatan on Thursday and approaching the northern Gulf coast by Friday afternoon. The forecast still calls for rapid strengthening: a hurricane by Thursday and a peak of 110 mph, a Category 2, over the central Gulf at 8 AM EDT Friday, then 105 mph at 8 PM EDT Friday about 75 miles off the coast south of Pensacola. Wind shear is forecast to increase near landfall, but the discussion says it isn't certain how fast the winds will come down, and that Isaias should be growing in size as it nears the coast. On our reading of the forecast points, the track line crosses the coast near the Alabama-Florida line, between Mobile Bay and Pensacola, late Friday night: before midnight Central time, shortly after midnight Eastern.

NHC's key messages call for a strong hurricane approaching the northern Gulf coast on Friday, with the risk of life-threatening storm surge along portions of that coast and of damaging hurricane-force winds over the Florida Panhandle, southern Alabama and Mississippi. Nothing in the advisory or the key messages is aimed at southwest Florida.

How close it gets to us

On the Advisory 4 track, Isaias makes its closest approach to Englewood around 2:30 PM EDT Friday, when the center is forecast to be out over the central Gulf near 28.0 North, 87.8 West as a Category 2 hurricane of about 105 mph. That is roughly 340 miles west of Stump Pass and about 375 miles west of Fort Myers. For comparison, Idalia in 2023 and Helene in 2024 both passed within about 145 to 160 miles of Englewood at our latitude.

At that distance the core of the storm stays far away. NHC forecasts tropical-storm-force winds to reach out 120 to 140 nautical miles (roughly 140 to 160 statute miles) on the storm's east side through Friday, which leaves something like 180 to 200 miles of open Gulf between the edge of those winds and our beaches. NHC's wind speed probability table makes the same point: it only lists places with at least a 3 percent chance of sustained 39 mph winds, and on Advisory 4 the only Florida peninsula location on it is Cedar Key, at 4 percent. Tampa, Venice, Punta Gorda and Fort Myers are not on the list at all.

That is the honest headline for this coast as of late Wednesday morning. The real question for us is not wind at the center but what the east side of a large, strengthening hurricane does to weather hundreds of miles away, and whether the track keeps drifting east.

Why a storm this far west still reaches us

Hurricanes are lopsided. In a storm moving north up the Gulf, the east side is where the deep tropical moisture is being drawn in off the Caribbean and the southern Gulf, and that side sits right over the Florida peninsula. Isaias already fits the pattern: NHC's 11 AM discussion describes a large area of deep convection near and northeast of the center, and says the storm should be growing in size as it approaches the northern Gulf coast because of its interaction with a trough.

We are also starting from a wet place. NWS Tampa Bay's forecast discussion, written just after midnight Wednesday with its key messages refreshed at 10:16 AM, has a front stalling over the central Florida peninsula with a deep plume of tropical moisture over the Gulf and Florida, and calls for numerous to widespread showers and scattered storms for the next several days whether or not Isaias were there. As Isaias lifts north on Friday, that front gets pulled back north and the flow over us turns southeasterly, then southerly by Saturday. That shift is the mechanism that turns Isaias's outer bands loose on this coast.

What it likely means here, Thursday through the weekend

This is what the NWS Tampa Bay forecast and the Advisory 4 track add up to for Englewood, Boca Grande, Charlotte Harbor, Venice and the Fort Myers coast. NWS Tampa Bay itself describes quite a bit of uncertainty starting Friday, depending on how strong Isaias gets and exactly where it goes, so read these as the likely shape of the next few days, not a promise. The marine numbers come from its coastal waters forecast issued at 3:16 AM Wednesday, the latest available at 11 AM.

• Rain, now through Saturday. Already a wet pattern Wednesday and Thursday from the stalled front. Friday and Saturday bring numerous to widespread showers and scattered thunderstorms as Isaias's bands rotate in. NWS expects locally heavy rain, minor flooding of urban and low-lying areas, and the highest totals near the coast. Bands can dump heavy rain fast and then clear out, so a dry hour is not the end of it.
• Wind turning and building. For the coastal waters from Bonita Beach to Englewood, NWS has light, shifting wind through Thursday, east 10 to 15 knots late Thursday night, southeast 10 to 15 knots Friday, east 15 to 20 knots Friday night, and southeast 20 to 25 knots Saturday, turning south Sunday afternoon. North of the stalled front, over the central and northern waters, the wind is northeast to east and stronger. Gusts in and near the bands will run well above the background wind.
• Rough water and a small-craft problem. NWS Tampa Bay expects hazardous conditions for small boats through the rest of the week, with small craft advisory conditions likely late in the week. Seas from Bonita Beach to Englewood stay around a foot or two through Thursday night and 2 to 3 feet Friday, then build after midnight Friday night to 4 to 6 feet, occasionally 8, with a southwest swell running 11 to 12 seconds, and hold there Saturday with rough water in the bays. From Englewood north to Tarpon Springs, Saturday's forecast is 5 to 7 feet, occasionally 9. NWS expects winds and seas to ease gradually over the weekend. No marine advisories were in effect for our waters late Wednesday morning.
• Rip currents. NWS says dangerous rip currents may develop along area beaches late Thursday night and Friday as the swell arrives. Its 3:16 AM surf zone forecast still had a low risk through Thursday for the Sarasota, Charlotte and Lee county beaches, so watch for that to change in later issuances. Manasota Key, Englewood Beach, Boca Grande and Venice all face the open Gulf. If the surf zone forecast goes to high risk, stay out of the water, and that goes double for anyone who isn't a strong swimmer.
• Isolated tornadoes and waterspouts. Possible in the stronger bands Friday into Saturday. More on this below.
• Drier behind it. NWS expects drier air and lower dew points early next week once Isaias is gone and high pressure builds in.

Tornadoes in the outer bands

This is the hazard that catches people out on a storm like this, because it does not need the center to be anywhere near you. The National Weather Service's description of tropical tornadoes is plain about it: they most often form in thunderstorms embedded in rain bands well away from the center, and the majority occur in the right-front quadrant of the storm, where wind shear and instability are best. With Isaias moving north up the central Gulf, the Florida peninsula is on its right side.

Milton in October 2024 is the extreme recent example of what a Gulf hurricane's outer bands can do to the peninsula. NHC's report counts 45 tornadoes across southern and central Florida on October 9, the day Milton came ashore, including the deadly EF-3 near Fort Pierce and Vero Beach on the Atlantic coast, a long way from where the center landed on Siesta Key. That was a much stronger storm coming straight at us, so it is not a forecast for Isaias. It is the reason not to dismiss tornado warnings just because the storm is headed somewhere else.

Tropical tornadoes are usually weak and short-lived, they move fast with the bands, and they are often wrapped in heavy rain, so you will rarely see one coming. Leave Wireless Emergency Alerts switched on in your phone settings, keep a weather radio or a loud alert app on overnight Friday, and know which interior room you would use. On the water, a waterspout from a tropical band is a reason to already be at the dock.

Water levels in Lemon Bay and Charlotte Harbor

As of late Wednesday morning, nobody is forecasting storm surge for our coast. NHC's new storm surge watch stops at Yankeetown, about 145 miles north of Stump Pass, and the southernmost stretch in its surge forecast is the Aucilla River to Yankeetown, at 2 to 4 feet above ground. NWS Tampa Bay's 11:23 AM local statement expects little to no surge impact across west-central and southwest Florida outside the Levy, Citrus, Hernando and Pasco coasts, and there were no coastal flood watches or advisories in Sarasota, Charlotte or Lee counties. Still, there are two things worth knowing if you live or keep a boat on the water here.

First, the wind direction. A south or southwest wind is the one that pushes Gulf water into Charlotte Harbor, Lemon Bay and Pine Island Sound and holds it there. NWS Tampa Bay's coastal waters forecast has our wind southeast at 20 to 25 knots on Saturday, which runs more along this coast than straight into it, turning south on Sunday as Isaias moves away. At this distance and these wind speeds, that should mean at most water running a bit higher than predicted rather than anything dangerous, but if the track shifts east, a south or southwest wind with more behind it is exactly how this coast floods. Our storm surge explainer covers why.

Second, the moon. The new moon is October 10, so the tides are building toward their monthly spring-tide peak right as Isaias passes. NOAA's predictions for the Englewood station in Lemon Bay put the high tides Friday through Sunday at around 1 to 2 AM and again in the early-to-mid afternoon. The after-midnight high runs a little higher each night, and from Saturday on it is the higher of the two. If water is going to push into low streets, docks or seawalls, that overnight high is the one to watch. Our tide pages carry the NOAA predictions for each station.

What past Gulf storms did here

Three recent hurricanes tracked up the Gulf to the Big Bend or the Panhandle, and all three still reached this coast. None is a perfect match for Isaias, and the differences matter as much as the similarities.

Michael, 2018, is the closest match for distance. Its center was roughly 250 miles west of Englewood at our latitude on the way to its Category 5 landfall near Mexico Beach. NHC's report found 2 to 4 feet of surge inundation above ground from Hernando County south to the Tampa Bay area, and the storm surge watch ran south to Anna Maria Island.

Idalia, 2023, passed about 145 miles west of us and came ashore near Keaton Beach. Its tropical-storm-force winds reached out 180 nautical miles on the southeast side at landfall, and NHC measured 3 to 5 feet of inundation from Chassahowitzka down to Englewood, including Tampa Bay, and 2 to 4 feet from Englewood to Naples, including Charlotte Harbor. A swath of 4 to 8 inches of rain fell over southwest and west-central Florida from its trailing bands.

Helene, 2024, passed about 155 miles west and made landfall as a Category 4 southwest of Perry. It was an enormous storm, and NHC found 4 to 6 feet of inundation from Venice to south of Englewood, and 3 to 5 feet from south of Englewood to Bonita Beach, including Charlotte Harbor. The St. Petersburg tide gauge set a record dating to 1947.

The lesson is not that Isaias will do the same. On Advisory 4 it is forecast to pass considerably farther away than Idalia or Helene, about 340 miles out, with a smaller wind field than Helene had. The lesson is that distance from the center is not the number that protects you on this coast. Size, track and the direction the wind blows across our shallow water decide it, and a modest eastward shift changes all three.

The track can still move, and it keeps nudging east

NHC called its track confidence below average at 5 AM. Advisory 4 doesn't repeat that phrase, but the guidance it describes is still split: the AI-based models generally on the east side of the envelope and the traditional physics-based models on the west. NHC nudged its forecast a bit east again, though not as far east as its corrected consensus aid (HCCA) or the Google DeepMind ensemble mean. The discussion also notes that many of the stronger solutions sit on the eastern half of the guidance and move faster, which is part of why NHC posted watches along so much coastline. So far these eastward nudges have moved where Isaias comes ashore more than how close it passes to us.

Remember what the cone is. It is built so that the storm's center stays inside it about two thirds of the time, judged on the last five years of NHC's own errors. That leaves one time in three outside it, and the cone says nothing about how wide the storm is. An eastward shift of a hundred miles would put the center about as close to us as Michael came, and getting to Idalia or Helene distances would take nearly twice that. That is not the forecast. It is the reason to check each new advisory through Thursday rather than deciding on Wednesday that this one is a miss.

What to do today

• Look up your evacuation zone now, while it's quiet. Florida's emergency management division puts it plainly: the greatest threat to life from a hurricane is storm surge flooding, and zones are drawn around that threat, not around wind.
• Sign up for your county's alerts: Alert Charlotte, Alert Sarasota County, or Lee County's alerts through its emergency management page.
• Boats: plan to be off the open Gulf from Thursday night through the weekend; NWS has seas building to 4 to 6 feet, occasionally 8, by early Saturday. If yours lives on a lift, raise it, strap it and pull the canvas. At a fixed dock, leave enough slack in the lines for higher water. Our boat prep guide has the full checklist.
• Bring in or tie down anything that can fly: patio furniture, kayaks, paddleboards, trash cans. Squall-line gusts in the bands are what move them.
• Clear gutters and the storm drain in front of your house. Heavy rain arriving at high tide is when low streets flood.
• Charge phones and battery packs, and leave emergency alerts on overnight Friday for tornado warnings.
• Stay out of the Gulf from Thursday night into the weekend if NWS posts a high rip current risk, even if the beach looks fine from the parking lot.
• Never drive through water over the road. You cannot see how deep it is or whether the shoulder underneath has washed out.
• Check back after the 5 PM and 11 PM EDT advisories tonight and the 5 AM and 11 AM advisories Thursday. If Sarasota, Charlotte or Lee counties start showing up in NHC's watches, warnings or wind probabilities, the plan changes.

Where to get the official word

NHC owns the track, intensity, watches and warnings. NWS Tampa Bay in Ruskin owns everything local: tornado warnings, flood advisories, marine and beach forecasts for Sarasota, Charlotte and Lee counties. Your county emergency management office owns evacuations and shelters. When they say something different from an app, including this one, they are right.