• MODIS Pic of the Day 16 November 2021

    From Dan Richter@1:317/3 to All on Tue Nov 16 11:00:10 2021
    November 16, 2021 - Fog in California

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    Fog
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    Winter moisture and cool weather created a dense fog over California’s
    Central Valley on November 13, 2021. The Moderate Resolution Imaging
    Spectroradiometer (MODIS) on board NASA’s Terra satellite acquired a
    true-color image of the morning fog on that same day.

    This fog, known as tule (too-lee), is a frequent feature of winter in
    the Central Valley. Although gorgeous to view from space, the thick low
    cloud (fog) can be hazardous for people on the ground. According to
    local media, the National Weather Service issued a special “very high
    transportation risk” alert on the morning of November 13. The alert
    warned drivers to be prepared for traffic delays, reduce speed, use low
    beams, and allow extra space between vehicles.

    The formation of tule fog requires three ingredients: wet ground, still
    air, and cold temperatures. Conditions are ripe after the ground has
    become damp from a recent rain. During the day, the warmth of the Sun
    causes the moisture to evaporate into the air. After sunset, air
    temperature slowly drops. Because cool air can hold less moisture than
    warm air the many tiny moisture droplets suspended in the air during
    the day combine into large droplets, creating “low cloud”, or fog. Tule
    fog tends to form—often rapidly— after sunset, become thickest just
    before dawn, then slowly thins as the air warms in the morning. Tule
    fog season typically begins in December and ends in February.

    Image Facts
    Satellite: Terra
    Date Acquired: 11/13/2021
    Resolutions: 1km (521.8 KB), 500m (1.4 MB), 250m (995.1 KB)
    Bands Used: 1,4,3
    Image Credit: MODIS Land Rapid Response Team, NASA GSFC



    https://modis.gsfc.nasa.gov/gallery/individual.php?db_date=2021-11-16

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