I'd like to understand how I can get both the forecast precipitation probability and volume. The reason is that I'd like to determine which days I can skip watering the lawn. So if the probability of rain is 90% but the volume is only 0.05 inches, I still want to water the lawn, but if the probability is 60% for a volume of 0.3 inches, I want to skip watering that day.
In the Weather device for the WUnderground plugin, I see Forecast Precipitation - Today; based on the source code, this looks like volume. Is that correct, and how do I find the probability value? Any help would be greatly appreciated.