Hurricane updates: Everything you need to know to track a storm

A hurricane is spinning somewhere over warm water and suddenly your phone becomes an alphabet soup of NHC, GFS, Euro, 12Z, 18Z and spaghetti models.

Relax. Hurricane updates are much easier to understand once you know what all of those things actually mean.

The National Hurricane Center forecast should always be your starting point. The computer models help meteorologists understand what could happen, while the cone, watches and warnings tell us what the official forecast says and when it’s time to pay attention.

Here’s how to read all of it.

When do hurricane updates and the new cone come out?

For Atlantic tropical cyclones, the National Hurricane Center normally issues its complete forecast package every six hours.

While Florida is on Eastern Daylight Time, those full updates arrive at:

5 a.m. | 11 a.m. | 5 p.m. | 11 p.m.

After Florida returns to Eastern Standard Time, they arrive at:

4 a.m. | 10 a.m. | 4 p.m. | 10 p.m.

But those are not necessarily the only updates you’ll see.

As a storm threatens land and coastal watches or warnings are in effect, the National Hurricane Center generally issues intermediate public advisories every three hours. Those provide updated information between the regular six-hour forecast packages.

And if something important changes unexpectedly, the NHC doesn’t have to wait for the clock. A special advisory can be issued at any time to account for a significant change in the storm or its forecast.

Shorter Tropical Cyclone Updates can also be issued between advisories to communicate important new information. When a storm is close enough to land that its center can be reliably tracked by radar, these updates can even provide hourly position estimates.

So think of 5 and 11 as the backbone of the hurricane forecast schedule, not the only times you’ll hear from the National Hurricane Center.

If you’re staring at the cone at 9 a.m. wondering when the next complete forecast package is coming, you usually don’t need to refresh your phone every 90 seconds.

The next regularly scheduled full advisory is coming at 11.

But there’s something important that cone is not telling you.

What does the hurricane cone actually mean?

The hurricane cone shows the probable track of the center of the tropical cyclone, not the size of the storm and not the area that will experience impacts.

For the familiar operational 2026 cone, its width is based on NHC forecast errors from the previous five years. The circles used to construct it are sized so that two-thirds of historical official forecast errors would have fallen inside them.  

That’s why the cone gets wider farther into the future. We’re generally more certain about where the center will be tomorrow than where it will be five days from now.

Here’s the easiest way to remember it:

Think CENTER, not STORM.

A large hurricane can send tropical-storm-force winds, flooding rain, tornadoes and storm surge well beyond the cone.

And there’s a new wrinkle in 2026. NHC is also publishing an experimental cone that uses ellipses and separately accounts for errors in storm speed and direction. Unlike the operational cone’s two-thirds methodology, the experimental cone is designed around a 90% likely track area for the center. It’s being issued alongside the operational cone during the 2026 season.  

Whichever cone you’re looking at, the big lesson doesn’t change:

The edge of the cone is not the edge of the danger.

So how do you know when the danger to your location is becoming more serious?

What’s the difference between a hurricane watch and warning?

Here’s the easiest hurricane-season vocabulary lesson you’ll ever get:

WATCH = possible.

WARNING = expected.

A hurricane watch means hurricane conditions are possible in the specified area. It’s generally issued about 48 hours before the anticipated arrival of tropical-storm-force winds.

A hurricane warning means hurricane conditions are expected and is generally issued about 36 hours before tropical-storm-force winds are anticipated.  

Notice something interesting there?

The clock isn’t based on when the hurricane’s eye arrives. It’s based on when tropical-storm-force winds begin.

That’s because you don’t want to be on a ladder hanging hurricane shutters when 45-mph winds arrive.

Tropical storm watches and warnings work similarly. A watch means sustained winds of 39 to 73 mph are possible, generally within 48 hours. A warning means they’re expected within 36 hours.  

And wind isn’t the only hazard with its own warning system.

What is a storm surge watch or warning?

Wind gets a lot of attention during a hurricane, and for good reason. But in many locations, you can shelter from hurricane-force winds in a properly built structure.

Water is different.

Storm surge is the abnormal rise of water pushed toward the coast by a storm, above the normally expected tide. As a hurricane approaches, its winds can drive enormous amounts of ocean water toward shore, flooding coastal areas, bays, rivers and other vulnerable locations.

And that water can travel well beyond the beach.

That’s why evacuation orders in hurricane-prone areas are often driven by storm surge and flooding risk, not simply by the hurricane’s category or where the center of the cone is pointing.

A storm surge watch means there is a possibility of life-threatening inundation from rising water moving inland from the coastline, generally within 48 hours.

A storm surge warning means there is a danger of life-threatening inundation, generally within 36 hours.

The key phrase in both is life-threatening inundation.

If local emergency management officials tell your evacuation zone to leave because of storm surge, don’t use the forecast cone or the hurricane’s category as a reason to stay.

Your evacuation zone is based on your vulnerability to water, and local evacuation orders are the instructions that matter.

Wind may damage a house.

Storm surge can make the house an unsafe place to be at all.

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Don’t know your evacuation zone? 

Search for your county or city emergency management agency + “hurricane evacuation zone” and use the official government map to look up your address. Evacuation zones are established locally, so the correct tool will depend on where you live.

And don’t wait until a hurricane is approaching to find out. Know your zone now, then follow evacuation orders from local officials when a storm threatens.

You can also explore the National Hurricane Center’s Storm Surge Risk Maps to see the broader storm surge vulnerability along the U.S. Gulf and East coasts.

Just remember: A storm surge risk map is not an evacuation map. Your local evacuation zone and instructions from local emergency management officials are what matter when a storm threatens.

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What do 00Z, 06Z, 12Z and 18Z mean?

The Z stands for Zulu time, the weather world’s shorthand for Coordinated Universal Time, or UTC.

Weather doesn’t stop at state or national borders, so meteorologists around the world need one common clock. That’s UTC.

While Florida is on Eastern Daylight Time, we’re four hours behind UTC:

00Z = 8 p.m. the previous evening

06Z = 2 a.m.

12Z = 8 a.m.

18Z = 2 p.m.

Here’s the trick.

18Z is basically 18:00 on a 24-hour clock, or 6 p.m. Subtract Florida’s four-hour daylight-time difference and you get 2 p.m.

When Florida returns to Eastern Standard Time, we’re five hours behind UTC, so 18Z becomes 1 p.m.

Congratulations. You now speak a little meteorologist.

But why do you hear those same Z times whenever somebody starts talking about the GFS?

When do the GFS and Euro weather models update?

The American GFS, or Global Forecast System, has four main cycles each day: 00Z, 06Z, 12Z and 18Z.

But there’s a subtle point that’s worth knowing.

If 18Z is 2 p.m. in Florida during daylight time, that does not mean the complete 18Z model magically appears at 2 p.m.

That’s the model’s cycle or initialization time. The computer still has to process enormous amounts of information and produce the forecast, so the forecast hours become available afterward.

That’s why you’ll hear meteorologists say, “The new GFS is coming in.”

They’re literally watching the newest forecast populate.

The European Centre for Medium-Range Weather Forecasts produces the other household name: the ECMWF, which everyone simply calls the Euro.

For years you often heard the Euro described as a twice-daily model. That’s no longer the whole picture as ECMWF’s forecasting system has expanded its operational cycles and AI forecasting capabilities.

And the GFS and Euro have plenty of company.

What other hurricane models are there?

The GFS and Euro may get top billing, but meteorologists have a much larger toolbox.

You’ll also hear names such as the UKMET from the United Kingdom, Canada’s CMC, NOAA’s hurricane-specific HAFS-A and HAFS-B, the Navy’s NAVGEM, and COAMPS-TC, another system designed specifically for tropical cyclones.

And now there’s a new player at the table: artificial intelligence.

AI forecasting systems from organizations including Google DeepMind and ECMWF are becoming increasingly important. Rather than replacing every traditional physics-based model overnight, they’re giving forecasters another powerful way to examine possible atmospheric outcomes.

So why have all these models instead of building one giant supermodel and calling it a day?

Because predicting the atmosphere is ridiculously complicated.

Different models process observations differently. They can use different resolutions and mathematical approaches and handle thunderstorms, clouds, the ocean and other physical processes differently. Some forecast the entire planet while others concentrate computational power around tropical cyclones.

That means two very good models can look at essentially the same atmosphere and come up with different answers.

And that’s not necessarily bad news.

Model disagreement is information.

If reliable guidance is tightly clustered around one solution, confidence can increase. If the models scatter from Texas to Florida, Mother Nature is essentially telling us that the answer isn’t clear yet.

Which brings us to that map covered with colorful noodles.

What is a spaghetti model plot?

A spaghetti plot puts multiple forecast tracks on the same map so you can quickly see how much agreement or disagreement exists.

But here’s where social media gets into trouble.

Those lines are not necessarily a bunch of equally likely hurricane tracks.

Depending on the graphic, they might be completely different forecast models, members of one model’s ensemble system, or a mixture of guidance.

So one lonely line crossing your hometown doesn’t mean there is suddenly a hurricane forecast for your house.

The useful information is usually in the pattern.

A tightly clustered bundle suggests the guidance has relatively good agreement on the track. A giant plate of spaghetti spread across hundreds of miles tells you uncertainty is much greater.

But what’s an ensemble?

Why can one weather model have dozens of different tracks?

Because meteorologists know something important about the atmosphere:

We can never measure every inch of it perfectly.

An ensemble forecasting system runs a model many times with slightly different starting conditions or configurations. Think of it as asking the atmosphere the same question repeatedly while making tiny changes to what we think the atmosphere looks like right now.

If most of those simulations keep arriving at a similar answer, that’s useful.

If they scatter everywhere, that’s useful too.

It tells meteorologists that small differences in today’s atmosphere could produce very different outcomes several days from now.

That’s why those clouds of dots and tangled lines aren’t clutter.

They’re uncertainty made visible.

Which hurricane model should you trust?

Don’t pick a team.

There is no rule that says the Euro always beats the GFS, the GFS always beats the Euro, or an AI model that nailed the last storm will nail the next one.

Meteorologists look for trends, agreement and consistency. We compare deterministic models, ensembles, hurricane-specific guidance, observations, aircraft reconnaissance when available and the actual atmospheric setup.

Most importantly, the National Hurricane Center does the same thing with far more information and expertise than the person who just posted one scary model screenshot on Facebook.

So when a model suddenly shows a Category 4 hurricane hitting Florida seven days from now, remember:

One model run is interesting.

A trend is important.

Agreement builds confidence.

The National Hurricane Center forecast is official.

And once you understand that, hurricane updates start looking a lot less like alphabet soup and a lot more like a story slowly coming into focus.

The cone gets narrower. The spaghetti gets tighter. Watches become warnings.

And instead of chasing every colorful line across your phone, you’ll know which information actually matters.

Where should you get hurricane information?

With thousands of hurricane maps, model runs and social media posts flying around, where you get your information matters just as much as knowing how to read it.

Start with the  ⁠National Hurricane Center. This is the source for the official tropical cyclone forecast, including the cone, watches and warnings, forecast discussion, wind probabilities, storm surge information and key messages.

For what’s expected where you live, use your local  ⁠National Weather Service forecast office. Enter your city or ZIP code to see your local forecast, watches, warnings, radar and other hazard information.  

Want to nerd out on the computer models?  ⁠Tropical Tidbits is an excellent free resource. It provides visualizations of the GFS, Euro, ensembles, hurricane models and other forecast guidance. Just remember that model output is guidance, not an official forecast. Tropical Tidbits itself directs users to the National Hurricane Center for official tropical cyclone information.  

And that’s probably the most important rule in this entire guide:

Use models to understand the possibilities. Use trusted meteorologists to understand what they mean. Use the National Hurricane Center and National Weather Service for the official forecast, watches and warnings.

Even the NHC cautions against relying on one computer model. It says its official forecasts, which combine available model guidance with human forecaster expertise, have historically had smaller average errors than any individual model.  

During a hurricane, somebody will always have a scarier map, a farther-west model run or a screenshot with a giant red circle.

Before you share it, check the source.

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