The big weather news story today is the blanket of fog that was (and still is) draped across the nation from Washington D.C., all the way to Texas, down into Florida, cutting visibility in some parts to as low as 1/10th of a mile.So, what causes fog?
Well, fog is basically clouds on the ground. It is formed in the same way that clouds in the sky are formed. Moisture in the atmosphere condenses when the temperature and the dewpoint temperature collide, generating a close to, if not 100% relative humidity. In this case, radiation fog is what we see across the country. The surface was warmed throughout the day. Then, as the cooler air quickly moved in with the night and high pressure, fog formed.
Fog cuts visibility causing travel nightmares. You want to make certain and use low beams when facing fog, as high beams, reflect off the fog and actually hurt visibility. Also, it causes delays at airports for the sake of traffic management. Exercise extra caution during periods of dense fog.
Dense Fog Advisory
The warning from the National Weather Service, which has issued dense fog advisories for many areas is that during periods of dense fog, meaning fog in some areas cuts visibility to less than 1/4 of a mile, is that you should:
A DENSE FOG ADVISORY MEANS VISIBILITIES WILL FREQUENTLY BE REDUCED TO LESS THAN ONE QUARTER MILE. IF DRIVING...SLOW DOWN...USE YOUR HEADLIGHTS...AND LEAVE PLENTY OF DISTANCE AHEAD OF YOU.For details about your area, click on your region after following this map to the link.The dark grey areas denote areas with dense fog advisories issued by the National Weather Service.
Have a great day!