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Swell Models and Forecast Charts



*click chart to view animation

South America Wave Heights

The FNMOC is another version of the THE SIGNIFICANT SWELL HEIGHT FORECAST charts, which shows us a full 7-day forecast of SWELL/SEA HEIGHTS occurring in smaller scale maps, giving us a tighter resolution. With some slightly different tweaking to get a better view of a smaller area the FNMOC model works the same way the bigger models work… using a wind model to determine surface wind speeds and then doing the math; processing the duration, intensity, as well as the path/track of those winds, and then crunching out a numerical picture of how big the seas will be anywhere in the assigned (nested) area. Again these models use colorized maps to show sea-heights and the movement of the storm tracks.

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South America Wave Periods

Again the FNMOC is a smaller, more focused version of the swell-period forecast charts that you can see globally, by ocean, regionally, and sub-regionally. They track swell in swell period form as the energy moves away from the storm source. This tracking, particularly at this tighter resolution allows you to see how the incoming swell moves through the region…and in cases like Southern California or Central America, you can see how it may take a swell an extra day to move completely from Central America to Southern Mexico. Again this is a good tool to use in tandem with other models…using the wave heights, sea-level-pressure, and swell period forecast models you can paint a very vivid picture on how a swell will be affecting your favorite breaks.

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South America Precipitation

Yet another swell tighter resolution version of the sea-level-pressure chart…still gives you the 7-day forecast but since the FNMOC charts we are normally using, are targeted at the tropical regions, it gives us more of a heads up on potential tropical storms. If we see a tightly wound ball of low-pressure, and lots of green-to-red/purple colors swirling around the low, there is a good chance at some intense rainfall, thunderstorms, which generally indicate we could see some deeper convection and potentially a tropical storm forming in the region.

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South America Winds

This chart looks very much like the COAMPS model but don’t mistake them for each other. The FNMOC wind-stream forecast model shows the surface winds, and even pulls out areas where the winds get intense by using color blobs and wind flow with those same directional areas. The main difference is that the COAMPS uses a grid that creates a point every 10-meters while the FNMOC model, to save processing power, has grid points as far as 10-15 miles apart…it makes for less “dialed in” focus that you see on the COAMPS but it saves a lot of time crunching the numbers and will update faster and more often throughout the day.

South America East Coast Surf Regions