Why so much fog for so long?
The Dense Fog Advisory that the National Weather Service issued lasted until 10 a.m., but areas of fog were constant through midday.Fog is by definition a low cloud on the ground. But conditions have to be right to get fog for form.
We also need high moisture content in the air right at the surface. This measurement of moisture content in the atmosphere is called the dew point.When the air temperature and the dew point are the same, the atmosphere has 100% humidity content and often fog begins to form.So, why did the fog last nearly all morning?Almost all weather on Earth occurs in the lowest level of the atmosphere. This is called the troposphere.
Sometimes during fog events, the fog lasts because a temperature inversion has set up in the lowest levels of the troposphere.
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