You can download 'real-world' weather data from the Internet and display the data in the flight simulation. Starting with Microsoft Flight Simulator 2000, you can use the Real-World Weather feature. The most recent data for some weather stations may be several hours old and may not include conditions at all altitudes. When the simulated weather changes, the weather may not match the current real world conditions. The simulated weather can also be modified by using the Dynamic Weather feature so that the simulated weather changes. You want to verify that you can connect to the Web site, that the Web site is running, and that you and your Internet service provider (ISP) have not cached the old data. If the simulated weather does not match the real world conditions, there are several possible causes that you can investigate. The Real-World Weather feature must retrieve data that is provided by another company from a Web site. This article describes the known issues with the Real-World Weather feature in Microsoft Flight Simulator.