A Catalina eddy is visible near the center.Ī typical June Gloom morning consists of marine stratus clouds covering the coast of southern California, extending a varying distance inland depending on the strength of the June Gloom effect that day. The San Fernando Valley and San Gabriel Valley also are covered, with clouds spilling inland as far eastward as San Bernardino. Although the term June Gloom is used by Californians all along the coast, the content that follows is more specific to the weather patterns of southern California.ĭescription Satellite image of a strong June Gloom day, showing marine layer clouds covering the coastal regions of the counties of Santa Barbara, Ventura, Los Angeles, Orange, and San Diego. Scientists study the cloud fields that make up June Gloom to increase understanding of cloud behavior at the onset of precipitation. This weather pattern is relatively rare, and occurs only in a few other parts of the world where climates and conditions are similar. June Gloom is stronger in years associated with a La Niña, and weaker or nonexistent in years with an El Niño. May and June together are usually the cloudiest months in coastal California. June Gloom usually clears up between mid-morning and early afternoon, depending on the strength of the marine layer and the distance of the location from the Pacific Ocean, and gives way to sunny skies. The overcast skies often are accompanied by fog and drizzle, though usually not rain. While it is most common in the month of June, it can occur in surrounding months, giving rise to other colloquialisms, such as “Graypril,” "May Gray," "No-Sky July," and "Fogust." Low-altitude stratus clouds form over the cool water of the California Current, and spread overnight into the coastal regions of California. June Gloom is a California term for a weather pattern that results in cloudy, overcast skies with cool temperatures during the late spring and early summer. June Gloom conditions prevailing at Seal Beach in late morning, June 2013. Weather phenomenon where clouds develop and temperatures cool over coastal California
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