tomorrow.io is a $350M unicorn using "Opportunistic Sensing" (cellular microwave links, IoT sensors, LEO satellites) to deliver hyper-local weather forecasts at 500×500m resolution and 1–15 minute updates—far sharper than traditional 10×10km grids. The startup converts real-time micro-climate data into actionable B2B SaaS alerts for enterprises (airlines, delivery/rideshare, construction, logistics) that can directly affect profit/loss: airlines optimize de-icing and landing schedules; ride-sharing adjusts surge pricing before rain arrives; construction firms halt concrete pours. Physics-informed AI enables 0–2 hour "nowcasting" that turns meteorological numbers into time-critical business decisions. Partners include DoorDash, Uber, Grab, JetBlue, Delta, and NASA.