Heat Wave Bakes Western US While Autumn Chill Hits East
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Extreme temperature divide between East and West US; East experiencing fluctuation between below and above average temps while West basks in 10-20 degrees above average heat.
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Cooler temps in East attributed to dip in jet stream bringing some of coldest air since March; crisp, autumnal feel.
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Prolonged summer pattern out West with temps 10-20 degrees above average, record-breaking heat wave.
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Heat advisories issued for parts of California as forecast predicts many cities will break daily temperature records.
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Return to normal temps expected along Pacific Coast by end of week but extended record heat inland through weekend.