The process of weather forecast

The weather forecast process of our city for one day is as follows: there was no forecast of heavy rain today yesterday, but it rained today. After the rainstorm in the morning, the meteorological observatory called: "rainstorm yellow signal: it may rain in the next 24 hours." At noon, the sun suddenly brightened. Not long after, the Meteorological Observatory called again: "The rainstorm yellow signal has been lifted." ! ! !