![\"california-2307-2\"](\"http:\/\/us.weatheramerica.com\/wp-content\/uploads\/sites\/2\/2025\/07\/california-2307-2.jpg\")
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A sprawling, wavy jet stream<\/strong> now loops across the Northern Hemisphere<\/strong>, locking a stubborn ridge near Alaska<\/strong> while carving a deep trough along the Pacific Coast<\/strong>. That shimmering ribbon of high-altitude air steers marine layer<\/strong> clouds straight into California<\/strong>, suppressing daytime warmth and leaving neighborhoods from Ocean Beach<\/strong> to Livermore<\/strong> wrapped in an unseasonably chilly cloak. At sunrise today in New York<\/strong>, thermometers in San Francisco<\/strong> hovered close to 57 \u00b0F (14 \u00b0C)<\/strong>, scarcely budging by mid-afternoon as the low gray ceiling refused to lift.<\/p>\n <\/p>\n Beneath the overcast, the North Pacific High<\/strong>\u2014an immense clockwise-spinning dome\u2014has shifted northward, intensifying the onshore gradient and pulling salty, moisture-laden breezes far past the usual coastal strip. That pressure difference sharpened in June<\/strong> and deepened through July<\/strong>, producing an almost continuous sequence of breezy evenings along the Marin Headlands<\/strong>, gusting past 25 mph (40 km\/h)<\/strong>, and funnelling cool mist into the Delta<\/strong>. Even interior valleys that often roast above 95 \u00b0F (35 \u00b0C)<\/strong> have idled near 78 \u00b0F (26 \u00b0C)<\/strong>, a full 10 \u00b0F (6 \u00b0C)<\/strong> below seasonal norms.<\/p>\n <\/p>\n Sea-surface readings tell the same story. Pockets of colder-than-average water stretch from Point Arena<\/strong> to Monterey Bay<\/strong>, amplifying condensation at the coast. The result is the now-familiar \u201cNo-Sky July\u201d<\/strong>: dawn drizzles, muted mid-day light, and early twilight under a seamless marine deck. Residents in the East Bay<\/strong> woke yesterday to moisture beading on parked cars along College Avenue<\/strong>, while commuters on the San Mateo Bridge<\/strong> crossed an indigo bay still blanketed by low stratus at 3 p.m.<\/p>\n <\/p>\n The atmospheric choreography keeps repeating. Research over the last two decades links these quasi-stationary patterns to amplified warming in the Arctic<\/strong>, which slows the jet\u2019s west-to-east speed, letting ridges and troughs linger. While Europe<\/strong> and Asia<\/strong> endure punishing heat domes above 105 \u00b0F (41 \u00b0C)<\/strong>, and the Central United States<\/strong> battles flash-flood clusters, California<\/strong> remains on the trough\u2019s cool flank, trading scorching afternoons for sweatshirt mornings.<\/p>\n <\/p>\n Forecast soundings this afternoon show the marine inversion stacked below 2,000 feet atop San Jose<\/strong>, suggesting another round of stubborn cloudiness tonight. Infrared models hint at only brief clearing east of Skyline Boulevard<\/strong>, so Redwood City<\/strong> may top out near 69 \u00b0F (21 \u00b0C)<\/strong> before fog rolls back in after sunset. Farther north, vineyards around Napa<\/strong> and Santa Rosa<\/strong> should touch 77 \u00b0F (25 \u00b0C)<\/strong> under hazy sun, yet evening temperatures are set to tumble quickly into the crisp mid-50s \u00b0F (12\u201313 \u00b0C).<\/p>\n <\/p>\n Across the South Bay<\/strong>, Sunnyvale<\/strong> and Santa Clara<\/strong> expect partial sunshine by late morning, but highs stay confined to the low 70s \u00b0F (21\u201322 \u00b0C)<\/strong>. Meanwhile, surfers eyeing Santa Cruz<\/strong> will meet a glassy ocean at 60 \u00b0F (16 \u00b0C)<\/strong>, with light northwest swell and air readings barely warmer along the boardwalk.<\/p>\n <\/p>\n Meteorologists watching the 500-millibar charts see little evidence of a rapid shuffle. Ensemble suites keep the ridge-trough couplet nearly stationary into early August<\/strong>, implying more days of filtered light, modest breezes and temperatures stubbornly parked below regional averages. For now, the Golden State<\/strong> lives up to its nickname only at sunrise, when the first hint of yellow slips beneath that durable slate-gray lid, promising another remarkably cool California<\/strong> summer day.<\/p>\n","protected":false},"excerpt":{"rendered":" A sprawling, wavy jet stream now loops across the Northern Hemisphere, locking a stubborn ridge near Alaska while carving a deep trough along the Pacific Coast. That shimmering ribbon of high-altitude air steers marine layer clouds straight into California, suppressing daytime warmth and leaving neighborhoods from Ocean Beach to Livermore wrapped in an unseasonably chilly […]<\/p>\n","protected":false},"author":2,"featured_media":6379,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6376","post","type-post","status-publish","format-standard","has-post-thumbnail","category-news"],"yoast_head":"\n