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A cool start to the week in San Francisco<\/strong><\/p>\n This Memorial Day<\/strong> began with gray skies and chilly winds<\/strong> across San Francisco<\/strong>, making it a perfect morning for a windy sail across the Bay<\/strong> or a ride on the SkyStar Wheel at Fisherman\u2019s Wharf<\/strong>. With highs only in the upper 50s to low 60s (around 14\u201317 \u00b0C)<\/strong> and gusts reaching 35 mph<\/strong>, it\u2019s a brisk beginning. Areas like the Mission District<\/strong> and Potrero Hill<\/strong> may briefly enjoy some afternoon sunshine, while the western neighborhoods<\/strong> remain cloud-covered. Tuesday<\/strong> promises a bit more sun and a slight temperature bump<\/strong>, but coastal areas will still feel quite brisk.<\/p>\n <\/p>\n The heat builds inland by midweek<\/strong><\/p>\n While the coast remains cool, a dramatic warming trend<\/strong> is taking shape inland. Starting Wednesday<\/strong>, a broad ridge of high pressure<\/strong> will strengthen across the Western U.S.<\/strong>, triggering unseasonably hot<\/strong> conditions from Central California<\/strong> to Alberta<\/strong>. This ridge is part of a larger, highly amplified jet stream pattern<\/strong>, with a cutoff low developing over Southern California<\/strong>, signaling a chaotic upper-atmospheric setup<\/strong>.<\/p>\n By Thursday<\/strong>, cities such as Livermore<\/strong>, Napa<\/strong>, and Concord<\/strong> will begin to feel the heat, pushing well into the 90s (32\u201337 \u00b0C)<\/strong> and likely staying there into the weekend<\/strong>. Meanwhile, coastal zones<\/strong> will remain stuck in the 60s and 70s (16\u201324 \u00b0C)<\/strong>, with the marine layer<\/strong> firmly in place over San Francisco<\/strong> and surrounding shoreline areas.<\/p>\n <\/p>\n Friday could challenge May heat records<\/strong><\/p>\n Friday<\/strong> is expected to bring the most intense heat<\/strong>, especially across the Central Valley<\/strong>. Redding<\/strong> is forecast to reach a scorching 107 \u00b0F (41.7 \u00b0C)<\/strong>, just 2 degrees<\/strong> short of its all-time May record<\/strong>. Sacramento<\/strong> may top out at around 105 \u00b0F (40.6 \u00b0C)<\/strong>. This spike in temperature could extend into the East Bay<\/strong> and North Bay<\/strong>, reaching areas not typically associated with such extreme heat at this point in spring.<\/p>\n Some weather models hint at brief offshore winds<\/strong> developing on Friday<\/strong>, which could drive inland heat toward the coast<\/strong>, increasing the risk of fire weather<\/strong>. This sharp inland-coastal temperature gradient<\/strong> is common in late May, but the unstable upper-air pattern<\/strong> makes predictions challenging. The cutoff low<\/strong> and wavy jet stream<\/strong> may even trigger tropical activity<\/strong>, adding another layer of uncertainty.<\/p>\n <\/p>\n Regional forecasts for Monday and Tuesday<\/strong><\/p>\n North Bay:<\/strong> Expect clouds in the south<\/strong>, with clearing north of Santa Rosa<\/strong>. Coastal highs will stay in the low 60s (16\u201317 \u00b0C)<\/strong>, while inland zones like Napa<\/strong> and Novato<\/strong> may reach the mid-70s (around 24 \u00b0C)<\/strong>. Winds through the Petaluma Gap<\/strong> could gust up to 30 mph<\/strong>. Tuesday<\/strong> warms into the upper 70s (25\u201326 \u00b0C)<\/strong> inland, with clearer skies overall.<\/p>\n East Bay:<\/strong> Memorial Day brings marine stratus clouds<\/strong> along I-80<\/strong>, clearing by late morning. Expect highs from the upper 60s (20 \u00b0C)<\/strong> near the Bay to around 80 \u00b0F (27 \u00b0C)<\/strong> inland. Tuesday<\/strong> heats up further, with Concord<\/strong> and Walnut Creek<\/strong> reaching the low-to-mid 80s (28\u201329 \u00b0C)<\/strong>.<\/p>\n <\/p>\n Pacific Coast and Peninsula:<\/strong> A deep marine layer<\/strong> keeps areas like Half Moon Bay<\/strong> and Pacifica<\/strong> in the upper 50s (14\u201315 \u00b0C)<\/strong> with potential drizzle in the hills<\/strong>. Redwood City<\/strong> and San Mateo<\/strong> may see partial clearing<\/strong> and mid-60s (18\u201319 \u00b0C)<\/strong>. Tuesday<\/strong> brings modest warming, reaching upper 60s to mid-70s (20\u201324 \u00b0C)<\/strong> inland.<\/p>\n South Bay and Santa Cruz:<\/strong> San Jose<\/strong>, Cupertino<\/strong>, and Milpitas<\/strong> will warm to the mid-to-upper 70s (24\u201326 \u00b0C)<\/strong> Monday. Santa Cruz<\/strong> will stay cooler but still pleasant in the low 70s (21\u201322 \u00b0C)<\/strong>. By Tuesday<\/strong>, San Jose<\/strong> will push into the low 80s (27 \u00b0C)<\/strong> under sunnier skies.<\/p>\n This week marks California\u2019s first significant heat event of the year<\/strong>, not quite a formal heat wave<\/strong>, but close. Expect record-challenging temperatures<\/strong> inland, persistent coastal fog<\/strong>, and increased fire weather concerns<\/strong> through the end of the week.<\/p>\n","protected":false},"excerpt":{"rendered":" A cool start to the week in San Francisco This Memorial Day began with gray skies and chilly winds across San Francisco, making it a perfect morning for a windy sail across the Bay or a ride on the SkyStar Wheel at Fisherman\u2019s Wharf. With highs only in the upper 50s to low 60s (around […]<\/p>\n","protected":false},"author":15,"featured_media":2977,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2976","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news"],"yoast_head":"\n