system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How does weather forecasting work?
gpt
Take a map. Split it up into a grid of squares. Get climate data for that square going back as far as you can. Take the date, the current conditions, and the climate data for that square and run it through a huge super computer. The super computer uses a ton of complicated math and statistics algorithms to compute a forecast. The percent chance of rain is the chances of there being precipitation somewhere in that square. The low temperature is based on the lowest forecasted dew point.