This is probably because of either poor sensor coverage, or a stale (old) forecast. Many weather services do not issue 'nowcasts' that constantly update with th

This is probably because of either poor sensor coverage, or a stale (old) forecast. Many weather services do not issue 'nowcasts' that constantly update with the latest weather observations (it's a hard and interesting problem), but rather a single forecast say 4x a day as the latest Numerical Weather Prediction model run comes in. Fwiw, I agree with your bemusement and scorn - it's not good enough! (I say this as someone who has had roles where I issued these 'always stale' forecasts)