Some parts of mid-Missouri woke up to a thick layer of fog this morning, while some saw clear blue skies to start the day.
Why was that?
Well, for starters, we need to have an understanding as to why fog forms… and it’s many differing types. In general when we forecast fog, we look at how air temperatures drop during the night, in relation to the observed dew point (dew point is air temperature measurement at which water vapor will be able to condense). If the actual surface air temperature falls to the dew point, fog will begin to start forming.