Why does rainfall on the radar (one hour total and storm total) not match up with what has actually fallen?
The rainfall depicted on the radar maps are estimates of what the radar’s precipitation algorithms (computer programs) have accumulated. These are not always accurate estimations, particularly beyond about fifty miles from the radar site in the Santa Cruz Mountains. Because the earth surface curves away from the radar, and the because the radar beam scans at a little bit above horizontal, the radar beam is scanning a progressively higher altitudes above the surface as it moves away from the radar site. This causes the beam to scan above the precipitating cloud as it moves farther away. So, be aware that precipitation estimates from the radar ofter underestimate rainfall, particularly at locations more than 50 miles from the radar site. back to questions • How do I read those numbers at the bottom of the Zone Forecasts that look like this: SAN FRANCISCO 64 52 68 / 30 0 0 SAN JOSE 67 53 67 / 30 0 0 The numbers preceding the “/” are the temperature forecasts corresponding to the periods i
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- Why does rainfall on the radar (one hour total and storm total) not match up with what has actually fallen?
