![]() ![]() ![]() If conditions are not as strong, the Basin may be filled while the valleys may be clear. When the marine layer is strong and deep, clouds can fill the Los Angeles Basin and spill over into the San Fernando Valley and San Gabriel Valley, even extending into the Santa Clarita Valley and Inland Empire on exceptionally strong June Gloom mornings. The phenomenon forms earliest and lasts longest at the coast, with weaker effects as it moves further inland. īy late morning to early afternoon, solar heating usually is sufficient to evaporate the clouds, and the sun emerges. Fog and drizzle normally are found near the furthest inland extent of the gloom, where the cloud deck is closest to the ground. Often, the air is saturated with moisture, and fog also develops, along with frequent light mist and occasional drizzle. During a heavy June Gloom season, the condition may persist into the afternoon, or even all day during an exceptionally strong event. The clouds, which are formed by the marine layer, move in at night, usually after midnight, and typically dissipate in the late morning, giving way to clear, sunny skies. It's not uncommon for the layer to persist into the mid-afternoon or evening. On a strong June Gloom day, the clouds and fog may cover the San Francisco Bay Area, penetrate far inland down valleys such as the Salinas Valley in central California, or extend into the Inland Empire of southern California. ![]() 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. 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. 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. 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. ![]()
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