This program can produce a relatively accurate forecast, with diminishing resolution further out, of the next 14 days of weather given the 3-hour, 12-hour, and 3-day trends. In order to use it, you will have to have a measuring barometer and recording barograph. It works offline; the Scratch project can be downloaded for basic weather prediction without the usage of a supercomputer. Mostly accurate for typical weather conditions. If you'd like to try this out for fun, open your weather app and find a chart of air pressure over time measured in hPa (hectopascals) or millibar; take from it your 3-hour, 12-hour, and 3-day trends and your current air pressure reading. See how accurate or inaccurate the program is to the actual weather predictions. NOTE: Results may vary depending on the interpretation of the barograph. It seems to me that the best results are given by taking it entirely literally; even if there is evidently a rise from a previous low, if the barometer reads lower today than it did 3 days ago, then the 3-day trend is still "FALLING" until the air pressure rises above its value 3 days ago. Thus, "RISING" and "FALLING" really signify "higher at all" and "lower at all"; "steady" is still according to the regular and visible definition.
