Rainfall Totals shows how much rain has actually fallen on any spot on the map - across the past 1, 3, 12, 24, or 48 hours, measured by weather radar. It is not a forecast and not a satellite estimate; the meteorological name for this kind of data is QPE, or Quantitative Precipitation Estimation. If you have ever wanted to know whether last night’s storm dumped 5 mm or 50 mm on your street, open Map Layers and tap Rainfall Totals (QPE) under Extended Tools.