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red flag warning

From Wiktionary, the free dictionary

English

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Noun

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red flag warning (plural red flag warnings)

  1. (meteorology, US) A warning issued by the United States National Weather Service that conditions are ideal for wildfires.
    • 2014, Jeffery Sims, The No-Nonsense Guide to Heat Wave, Drought, & Hot Weather Safety:
      During red flag warnings, firefighting agencies will alter their staffing and equipment resources dramatically to accommodate the increased forecast risk.