Answer
Scientists use a device called Barometer.
Explanation:
My scientific explanation is that they collect and share data to help improve forecasts. Some of the tools they use include barometers that measure air pressure, anemometers that measure wind speed, Doppler radar stations to monitor the movement of weather fronts, and psychrometers to measure relative humidity. Weather forecasting or meteorology relies on a huge data collection network. This network includes land-based weather stations, weather balloons, and weather satellites. Weather forecasters also use data from offshore buoys and ships operating at sea.
By the way this is physics.
