They used historical data. Written weather references go back hundreds of years - long before computers were invented.
Weather is predicted at the scene of were it happens, or at a weather station.
Weather cannot be controlled, only predicted (imperfectly).
storm watching and weather radar
rain
The forecaster predicted the weather for the whole week
maybe it depands on the weather
I do not have real-time or historical weather data. You can check the predicted weather forecast for Frederick, MD on October 22, 2011 by looking at archived weather reports or using a historical weather database.
The weather for the 2012 German Grand Prix is predicted to be rainy with a chance of clouds.
Can't prevent them but they are predicted by weather observations. This is called meteorology. Tornados can be predicted but what can't be predicted is how they move or where they will go next.
when you get off your lazy butt when you get off your lazy butt
before the thunderstorm
Supercells and other types of weather cannot be predicted to that degree.