weather forecast 
noun
An analysis of the state of the weather in an area with an assessment of likely developments.The weather forecast is predicting heavy snowfall for Monday....
- The weather forecast predicts a sunny start on Sunday but showers arriving later in the day.
- This was inconsistent with the weather forecast and not typical of the local area.
Derivatives
weather forecaster
- A weather forecaster uses a three-dimensional map of the atmosphere, and calculates the temperature at which air will start to rise.
- In the background, a radio fizzed and the plummy tones of a weather forecaster announced: ‘There are warnings of heavy snow, prolonged rain and hazardous conditions right across the country in the next 24 hours.’
- Each weather forecaster seems to revel in it being the wettest October since whenever, or stressing how the temperatures are unusually high for this time of year and so on.
weather forecasting
- The use of radar and other instrumentation helps meteorologists track storms and study rainfall patterns, making weather forecasting more accurate.
- A scientist called Vilhelm Bjerknes, who lived in Norway around the turn of the century, was one of a group of experts who first formulated the problem of accurate weather forecasting in terms that we would recognise today.
- The 18th century saw many improvements and innovative ideas regarding weather forecasting.