Aweather station predicts that warm, humid air will pass over much cooler land during the early morning hours. which precaution should the weather station give to residents who are driving to work that morning?

When the air is humid it means that the air is already saturated with water vapor and that air is no longer capable of holding additional water vapor. This means that the next step should be precipitation (or rain, snow, etc). Therefore, the residents should be warn of the precipitation and be advised to bring protective devices such as umbrellas, raincoats, etc. 

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