San Diego NWS Issues High Temperature Alert With Inland Heat Surge Expected This Week
Southern Californians should brace for a scorching week as the National Weather Service San Diego warns of high temperatures surging 10 to 15 degrees above average, particularly for inland areas where the mercury is set to hit searing peaks Wednesday through Friday. According to the forecast, the deserts will feel the worst, with a potential Excessive Heat Watch looming that could transform into a Warning for parts of the lower deserts and possibly the Apple and Lucerne Valleys as the week progresses.
Despite the impending heatwave, coastal regions are expected to experience some reprieve thanks to a persistent marine layer, roughly 2000 to 2500 feet deep, that will help temper the escalating temperatures, but this moderation is a stark contrast against the backdrop of mountains, valleys, and deserts that will witness a stark 15 to 20-degree spike. Current predictions indicate Borrego Springs will likely match its previous high-temperature record of 112 degrees in 2013 as the rest of the region grapples with exceptionally warm minimum temperatures, particularly during Thursday and Friday nights and mornings.
City dwellers and beachgoers should expect morning low clouds from the coast. Still, with the marine layer becoming shallower from Wednesday through Friday, coastal clouds won't travel as far inland, potentially leading to clearer skies for inland valleys earlier in the day. According to the National Weather Service, the marine layer is forecasted to slowly deepen over the weekend, bringing some cooling relief as the high-pressure system weakens.
Meanwhile, outdoor activities could be affected as local westerly wind gusts of 25 to 35 knots are expected after 21Z, which might present challenges for those traversing mountain passes and desert slopes where moderate turbulence is likely and for those with plans in open desert areas where wind-blown sand could reduce visibility on roads including through or near the San Gorgonio Pass. Skies, however, will remain mostly clear aloft with some scattered to broken clouds at higher altitudes, promising unobstructed views for pilots above 20,000 feet.
Conversely, boaters can rest easy as forecasters predict smooth sailing conditions with no hazardous marine weather expected through Friday. Despite the high temperatures and windy conditions forecasted, the National Weather Service has not activated its Skywarn network. However, they do encourage spotters to continue reporting any significant weather developments that arise.
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