Rain, rain, go away. National Weather Service radar can often provide an accurate projection of a storm’s trajectory, but it’s not great at capturing conditions on the ground. After Hurricane Irene, New York decided that wasn’t good enough. So now the Empire State is relying more on scattered atmospheric observation stations than on the big data of national forecasts to predict crucial factors like rainfall. Supply depots have been set up to respond to the information gathered by the new system, called a “mesonet,” and neighboring states can benefit from access to the findings.