[ "SAN FRANCISCO (AP) — This March, residents of San Francisco are enjoying an unexpected heat wave, with temperatures reaching levels not seen in over two decades. As the city renowned for its chilly summers faces nearly 90°F (32°C) highs, nearby Phoenix is pegged to surpass 100°F (37.7°C) for the first time before April, marking a significant temperature anomaly for this time of year.", "Amid sunshine and warm breezes, locals flocked to outdoor spots like Crissy Field, taking in the spring-like weather. It feels like summer already in March; that’s crazy, but I love it, a local dog walker remarked as pets dashed through the waves.", "While the West is experiencing warmth, the Midwest and Eastern U.S. struggle under extreme snowstorms, resulting in thousands of flight cancellations as residents dig out from severe winter conditions.", "Attempts to cool down are evident in the Bay Area where records fell: San Francisco International Airport reported 83°F (28.3°C) almost matching historical highs, while Silicon Valley's Redwood City topped 90°F (32.2°C), breaking a previous record from 2004.", "Meteorologists caution that this heat wave is unusual, but brings back memories of similar spikes in temperature like those experienced in March 2005. In Las Vegas, the forecast calls for temperatures soaring as high as 98°F (36.6°C), with a potential for triple digits as early as Saturday, placing demands on visitors and residents alike to stay hydrated and aware.", "With early heat warnings issued for national parks like the Grand Canyon, officials urge visitors to avoid strenuous hikes during peak hours, indicating this weather phenomenon seems to signify a serious shift in seasonal patterns, potentially impacting water resources and outdoor activities.", "In contrast, Denver water authorities are already implementing water use restrictions, signaling an early onset of water supply issues as the warmer weather pushes preparative measures even further ahead." ]