What is it? Weather TL;DR is a simple weather forecast webapp using data from the weather.gov system. This was an experiment to see if I could write a simple webapp to tell me the current weather forecast in a compact and simple page. How do you use it? Usage it pretty simple. It will ask you if it is ok to use your location data. If you don’t agree then it presents a simple form where you can manually enter a latitude and longitude in decimal form.