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The intense marine layer observed this October can be attributed to several meteorological factors typical for coastal regions, especially on the U.S. West Coast.
The marine layer forms due to a temperature inversion, where cooler air at the surface, influenced by cold ocean currents (like those off California's coast), is trapped under warmer air above. This inversion inhibits vertical air movement, causing cooler, denser air to remain near the surface, often resulting in fog or cloud cover. This month, factors like persistent high-pressure systems compressing the marine layer near the coast, paired with seasonal changes in air masses, have made this effect particularly pronounced. These layers can remain in place for extended periods, especially when winds are weak or temperatures remain relatively stable, as has been seen in California this October. 1 reply
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