🌧️ Rainfall Intensity: Marshall-Palmer Drop Spectrum, Radar Reflectivity and Rain-Gauge Sampling Lab

Pick a rain rate from drizzle to violent downpour and see the drop-size spectrum behind it: how many drops per second land in a rain gauge, how large they are, what a weather radar would report in dBZ, and how noisy a small gauge reading is. Closed-form results are checked against brute-force sums and a 200-gauge Monte Carlo experiment.