How weather actually works — authored from the National Weather Service’s public-domain training materials. The atmosphere and its layers, pressure and wind (highs, lows, and why wind spirals), humidity and dew point (and why dew point beats relative humidity for “how muggy”), cloud types and what each foretells, stability and thunderstorms, fronts and mid-latitude systems, tornadoes and hurricanes (structure, safety, the real risk factors), winter weather (why freezing rain is the dangerous one), reading forecasts and radar (what “70% chance of rain” actually means), climate versus weather, and optical phenomena (rainbows, halos). Every explanation names the mechanism, corrects the folk belief, and leaves a rule. For weather watchers, storm spotters, pilots, and the permanently curious.