What Are The Spaghetti Models? Euro, GFS And AI Explained

Every hurricane season the same picture shows up on the news and in everybody’s group texts, a map of Florida with a dozen colored lines fanning out of the Gulf or the Atlantic, and most people know it’s called the “spaghetti models” but very few could tell you what each line is, which one to trust, or what the new AI model everyone keeps mentioning actually does differently. So I looked into it, because the timing of a forecast matters a lot more to your home insurance than most people realize, and I’ll explain why at the end.

What Are The Spaghetti Models?

Each strand of spaghetti is one computer model’s forecast of where the center of the storm will go, and they’re plotted on the same map so you can see where the models agree and where they split apart. When the lines bunch together the forecast is usually more confident, and when they fan out it means the models are reading the steering currents differently, so the path is genuinely uncertain. The National Hurricane Center doesn’t just pick one line, and its forecasters weigh all of them, along with satellite, aircraft and buoy data, to draw the official track and the cone you see on TV.

The Spaghetti Models Explained

There are dozens of models, but these are the ones that matter most and the ones people usually mean when they say “the European” or “the American”:

The American model (GFS, the Global Forecast System) - run by the U.S. government’s National Oceanic and Atmospheric Administration (NOAA), it’s a physics model, meaning a supercomputer takes current weather observations and solves the equations of how air, heat and moisture move, step by step into the future.
The European model (the ECMWF model) - run by the European Centre for Medium-Range Weather Forecasts, also a physics model working the same basic way, with its own methods and its own supercomputers.
Ensembles - both centers also run their model many times with slightly different starting conditions, and the spread of those runs shows how much the forecast could reasonably change, which is why some spaghetti plots have dozens of thin lines instead of a handful.
Google’s AI model (from Google DeepMind) - the new one, which learned from past weather instead of solving physics equations, explained in its own section below.
Europe’s AI model (AIFS) - the European Centre’s own AI model, in regular operation since February 2025, with an ensemble version since July 1, 2025.
America’s AI models (AIGFS and its ensemble versions) - NOAA put its own AI-driven global models into operation on December 17, 2025, citing better tropical tracks while using a fraction of the computing power.
The official National Hurricane Center forecast - not a model at all, but human forecasters blending everything above into the one track and cone that watches and warnings are based on.

What Is The New AI Hurricane Model?

The traditional models start from today’s weather and calculate forward using the laws of physics, which takes enormous supercomputer time, so there’s a limit to how many versions of a forecast can be run. The AI models skip the equations and instead learned, from decades of past weather, how the atmosphere tends to change from one moment to the next, so they still begin with the same real-world observations but produce a forecast in a fraction of the time and computing cost, and that means far more scenarios can be run to show the range of what a storm might do.

Google’s hurricane model, built by its DeepMind research lab, was trained on a reconstruction of decades of global weather plus a database of nearly 5,000 cyclones from the past 45 years, including each storm’s track, strength and size, and it produces 50 possible scenarios up to 15 days out. Google designed it to forecast a storm’s track and its strength in one system, which older approaches usually handled separately, and in Google’s own testing its five-day track forecasts landed on average about 87 miles (140 kilometers) closer to where storms actually went than the European ensemble did. It’s still an experimental model rather than an official forecast, so it feeds into the Hurricane Center’s forecast instead of replacing it.

Which Spaghetti Model Is Most Accurate?

No single model wins every storm or every year, and that’s exactly why the Hurricane Center blends them rather than following one, but recent seasons do have a clear standout. The 2025 season was the first time the National Hurricane Center used AI models in real-time operations, and in its season review it found Google’s model slightly beat the Hurricane Center’s own official forecast for the first three days, while James Franklin, the Hurricane Center’s former head of forecast verification, called it the best guidance forecasters saw all year. The European model and its ensemble were also among the stronger individual models in 2025, while the American GFS had a rough season for hurricane tracks, and the single best performer at every time period was actually a corrected blend of several models, which tells you why “average the good ones” usually beats betting on any one line.

So if you’re looking at a spaghetti plot, the honest answer is to pay the most attention to the official Hurricane Center cone, which already has the best models built into it, and treat any single line that wanders off on its own with some suspicion. The Hurricane Center’s own staff say plainly that none of the models are perfect and never will be, and forecasting how fast a storm strengthens, especially rapid intensification, is still the hardest part of the job for every model, AI or not.

How Many Days Ahead Can They Predict Where A Hurricane Will Hit?

This is the part that surprised me. According to the National Hurricane Center’s 2025 verification report, its track errors for the one to three day forecasts have been cut by roughly 75% over the past two decades, and in 2025 its average three-day forecast was off by about 85 nautical miles (about 98 regular miles), while the average five-day forecast was off by about 162 nautical miles (about 186 miles). The cone you see on TV runs out five days and is drawn so that the storm’s center stays inside it about two-thirds of the time, based on the Hurricane Center’s actual errors over the previous five years, which also means the center falls outside the cone about one time in three, and wind, rain and storm surge can reach well beyond the cone either way.

So in practical terms, by about five days out you’ll usually have a fair idea of whether your part of Florida is in play, by about three days out the track is typically within roughly 100 miles, and the formal alerts follow from there, with a hurricane watch posted about 48 hours before tropical-storm-force winds are expected and a hurricane warning about 36 hours before. That window is what gives people time to get shutters up, move the car, fill prescriptions and evacuate if they’re told to, and it’s a much bigger window than Floridians had a generation ago.

Can I Buy Homeowners Insurance When A Hurricane Is Coming?

Whether you call it home insurance or homeowners insurance, the policy you have when a storm shows up in the cone is almost certainly the policy you’ll have when it arrives, and that’s the real reason I wanted to write this. Once a named storm threatens Florida, insurance companies stop writing new homeowners policies and stop adding or increasing coverage until it passes, and the timing varies by company, because some stop the moment a watch or warning goes up anywhere in Florida while the storm is still far out, and others wait to see whether it shifts, so a better five-day forecast doesn’t buy you time to shop, it just tells you sooner that the window has already closed.

Your hurricane deductible - Florida law defines when hurricane coverage applies, beginning when the National Hurricane Center issues a hurricane warning for any part of Florida and ending 72 hours after the last hurricane watch or warning in the state ends (Fla. Stat. 627.4025), so it’s worth knowing what your hurricane deductible is before the season starts, not after.
Shutters and wind mitigation - the same prep the forecast gives you time for can also matter to your premium, because documented wind mitigation features can earn credits, and the roof-to-wall connection is usually the one worth looking at first, which we cover in our wind mitigation guide.

The best time to review your coverage is before June 1, when the season starts and nothing is spinning out in the water, because that’s when every option is still on the table and you can pick the best fit for your home on both coverage and price.

How Fast Can I Get Flood Insurance Before A Storm?

Homeowners insurance doesn’t cover flooding, and a flood policy through the National Flood Insurance Program typically has a 30-day waiting period before it takes effect, which is the number you’ll read everywhere. But here at The Insurance Man and Company, we also have several private flood insurance companies with much shorter waiting periods, for instance seven days or 14 days, and it varies by company, so just ask us.

Private flood insurance companies also stop writing new policies as a storm approaches, on the same varying timing, and at least one goes a step further and won’t cover flooding from a storm if the policy was bought while Florida was already under a tropical storm or hurricane watch for it, even after the waiting period has passed, so the time to buy flood insurance is well before anything is in the water. We explain the odds in Should I Buy Flood Insurance?

Written by Brian Lough, owner of The Insurance Man and Company in Sarasota, Florida. Licensed Florida insurance agent, license #P034754, with over 20 years in the business.

Last reviewed October 7, 2026

What Are The Spaghetti Models? The European, American And AI Models Explained