Hurricane Irma Spaghetti Models: Latest Tracks & Forecast

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South Florida Water Management District

A spaghetti model for Hurricane Irma as of September 5.

Where Hurricane Irma is heading depends, at times, on the model you’re looking at. Spaghetti models literally look like noodles on a map, and the latest ones late on September 5 were not good news for the Carolinas.

Some of the latest spaghetti plots show Hurricane Irma tracking along the east coast of Florida and then twisting north toward North and South Carolina and Georgia. See this spaghetti model from WTSP-TV. The model shows Irma tracking through Cuba and then up along the east coast of Florida and into Georgia. Weather.com, though, ran a spaghetti model for September 5 that made that less clear.

The South Florida Water Management District has an updated Hurricane Irma spaghetti model. Here’s what it showed as of 10:45 p.m. on September 5.

irma spaghetti model

Spaghetti model of Hurricane Irma.

What are spaghetti models? “Spaghetti models (also called spaghetti plots) is the nickname given to the computer models that show potential tropical cyclone paths. When shown together, the individual model tracks can somewhat resemble strands of spaghetti,” reports Cyclocane.

The site continues: “In short, it gives you a way to see where a tropical storm or hurricane may head. It can also give insight into whether the models are in agreement on the path of the storm (for instance, all models show Florida in the path of a hurricane) or if there is a wide differing opinion on where the storm may go. For instance, in the case of Tropical Storm Debby, the original NHC storm path had her going straight west to Texas, but if you viewed the spaghetti models at that time, you would have had a glimpse into just how uncertain Debby’s path was. Debby’s spaghetti models had her making landfall from anywhere from Texas to Florida to everywhere in between.”

You can see Cyclocane’s latest spaghetti models for Irma here. They also show the hurricane tracking northward to Georgia and the Carolinas, which is disputed by other models, which say Irma could track over the Gulf of Mexico or back to sea. The National Oceanic and Atmospheric Administration (NOAA) National Hurricane Center uses a cone forecast as its dominant model.

According to WYFF4, “So-called spaghetti models are various storm tracks predicted by computer systems built to make predictions based on historical data.” Explained The Washington Post: “Usually, each ‘strand of spaghetti’ is not representative of a unique model. Instead, the entire bowl of noodles is data churned out by the same weather model. Each noodle is called an ensemble member. When a weather model produces a forecast, it has to initialize the data, taking in current conditions to get an idea of what the atmosphere is already doing on a three-dimensional grid.” The Post notes that the models require estimates that are not always accurate.

The Post article has a September 5 spaghetti model also showing a track up the eastern coast of Florida and then into Georgia and the Carolinas.

Here are more of the latest Irma spaghetti models:

Some recent spaghetti models have Irma tracking north and possibly even missing Florida.

Weather.com notes that spaghetti models can have limitations. “Although most models show possible impacts, to present many models succinctly on a single chart, meteorologists generally produce spaghetti plots that usually only show the ‘where’ and a loose representation of ‘when’ for tropical systems,” the site reported. “To get to this level of brevity, meteorologists must only focus on the center point of a tropical system, which may or may not be accurate. We’ll get to more on that limitation later, but for now, let’s focus on the lack of impacts. These plots do not speak to whether a storm will bring rainfall, hurricane-force winds, surge, or other data; they just contain information about the storm’s future track.”

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