Firefighters brace for more California blazes

• Story Highlights
• Firefighters battle thousands of blazes to stalemate, but "red flag" warning remains
  
• Officials say low rainfall, parched vegetation likely to bring long, fiery summer
  
• Blazes scorched more than 550 square miles, destroyed 50 buildings
  
• Air quality warnings issued from Bakersfield to Redding
  
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