You can either select a city or enter the coordinates of your location. Next, you can either select a current storm, which uses the latest best track coordinates for the storm, or enter the coordinates for the storm yourself. (The latest best track coordinates for the storm come from the Automated Tropical Cyclone Forecasting System (ATCF), not from any advisory data that may be available for that system.) Please make sure that any coordinates you enter for you or the storm have a minus sign (-) for the Western and Southern hemispheres. Or, you can choose to instead use N or S and E or W. Don't know your coordinates? Find them here. You can learn more about this product here.