It's the fog season of the valley
It's the fog season of the valley
It is autumn in the Northern Hemisphere, which means that many people who live in mountainous areas are waking up in valleys full of fog.
As the nights lengthen with the season, the environment has more time to cool off and get closer to the dew point-The temperature at which the air becomes saturated and the water vapor condenses in fog. Since cold air is denser than hot air, it sinks and drains into the valleys, which means that the fog first develops there. Many valleys also have rivers and streams, which amplifies the process by providing a ready supply of water vapor.
the Radiometer visible for infrared images (VIIRS) on the Suomi NPP satellite captured a glimpse of this process in operation in the West Virginia mountains on October 24, 2018. The sensor acquired the night image at approximately 2 am, when the fog had filled many valleys of the Cumberland mountains.
On the other side of North America, a steep part of British Columbia had its own dose of fog in the fall valley. Just before noon on October 22, 2018, the Moderate resolution image spectroradiometer (MODIS) at Terra acquired a natural color image of the narrow valleys that house Lake Okanagan and Lake Upper Arrow. The false color version of the same scene facilitates the distinction between snow (cyan) and fog (white).
As the day progresses and temperatures rise, the valley fog often fades. The MODIS sensor in Aqua, which passed over the same area early in the afternoon, highlighted the process. In the afternoon, many of the areas that had been bathed in fog. I had cleared.
Sunlight through the mist of the valley can create an impressive landscape. If you are at high altitudes in wet conditions, pay attention to glories Y fog arcs, beautiful optical phenomena that can arise in the presence of fog and sunlight.
But also keep in mind the serious risks That fog can pose for drivers. Traffic accidents related to fog cause many more deaths in the United States each year than other high profile weather events such as heat waves, tornadoes and floods. according to data of the National Meteorology Service and the Federal Highway Administration.
Images from the NASA Earth Observatory by Joshua Stevens, using MODIS data from NASA EOSDIS / LANCE and GIBS / Worldview and VIIRS day-night band data from the Suomi National Polar-orbiting Partnership Legend of Adam Voiland.
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