It didn’t rain at my house today. Did it rain at yours? I am sure we have all experienced this situation at one time or another, where we hear about the downpour that happened on the other side of town, while our lawn remains dry. So which forecast would be correct, the one that said rain or the one that didn’t? Welcome to the wonderful world of “PoP,” the meteorological abbreviation for “probability of precipitation.” It is seen by the public, as a percentage, meant to convey the chances that a specific location will see rain or not. Unfortunately, the PoP number is one of the most misunderstood numbers in weather – even among meteorologists. That is why you will never see them in any of my forecasts on TV. When the National Weather Service issues a forecast for the Spokane/Coeur d’Alene area, the two cities are usually part of a “forecast zone” that includes most of Spokane county, a small piece of Lincoln County in Washington, and about half of Kootenai county. A PoP is issued specifically for Spokane, another one for Coeur d’Alene, and then those numbers are averaged to produce a PoP for the entire forecast zone. According to the National Weather Service office in Peachtree City, Ga., here is the formula used to produce the “PoP”: