Some web pages at this site contain forms that permit retrieval of archived data. If these fields are left blank, the data retrieval program will use default values which are typically the current date and time with a 24-hour time step. Most graphic data displays are GIF image maps. After the image appears, check the ending date and time to make sure the data reflects the time period you requested. The correct image should then appear.
Some image maps contain links to other maps, data tables, web pages, etc.
Descriptive pop-up text boxes are provided to aid navigation. Some browsers may not be able to display text boxes but a mouse pointer will indicate when an image has subsequent links. You can test this pop-up feature by pointing at graphical links on this page like the logos below. When displaying rain maps for past events, you may note some bogus values exceeding 76-inches. Real-time map displays will generally launch a new browser window.