An important piece of information for meteorologists is the ratio of the amount of water vapor in the air to the amount of water vapor needed to reach saturation at a given temperature. This information enables meteorologists to better predict the weather. What is this piece of information called?

Explanation:

doppler radar, radiosondes, weather satellites, buoys and other instruments are fed into computerized NWS numerical forecast models. The models use equations, along with new and past weather data, to provide forecast guidance to our meteorologists

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