SAN FRANCISCO (AP) — An extraordinary winter heat wave is blasting through the western United States, delivering record-threatening temperatures across a vast region spanning from California into the desert Southwest. The typically fog-shrouded city of San Francisco, known for its characteristically cool climate even during summer months, is witnessing residents peeling off winter clothing and gathering at popular outdoor spots like Crissy Field as the area endures its warmest March weather in more than 20 years.
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