Probability of Precipitation (PoP) is the likelihood that measurable rain falls at this exact location. A 40% chance doesn't mean it rains 40% of the time — it means a 4-in-10 chance you'll see any rain at all. Each bar covers a full clock hour starting from the next complete hour. The 60-min sparkline above covers right now, minute by minute. Learn more — NOAA ↗