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    Every year, thousands of runners prepare for big races such as the Boston, New York and Chicago marathons. To prepare properly, runners have to know how temperatures affect their running performance.
    How does temperature affect your running?
    Western US Warm Up 5 am Mon Static

    Building warmth to challenge records, bring flooding concerns to western US this week

    April 23, 2018, 5:26:24 AM EDT

    Although the week will kicked off on a seasonably mild note in much of the West, increasingly warm air will expand into the northern Rockies and Pacific Northwest during the rest of the week. more

    Southwest U.S. Weather Reports