NOAA Image of the Day

GFS Weather Model Shows Hilary and Irwin Merging

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Created with total precipitable water data from the NOAA Global Forecast System weather model, this animation from NOAA View shows the dissipation of Tropical Storm Greg and the merging of Hurricanes Hilary and Irwin over the next week or so. (The animation runs from today, July 25, 2017, to August 1.) Watch as the hurricane on the far right (Hilary) moves up and around the central storm (Irwin), seemingly consuming it. This phenomenon is called a Fujiwhara effect. The NOAA Global Forecast System weather model is one of the most widely used numerical forecast models in the world. Updated every six hours, the GFS provides data in three-hour time increments on a variety of global weather variables, including atmospheric moisture, which in shown here by the areas of blueish-gray. It is important to note that, like any predictive model, the forecast accuracy decreases significantly the farther out the prediction extends. For the latest information on these storms in the east Pacific, visit NOAA's National Hurricane Center.

Courtesy of NOAA Environmental Visualization Laboratory