headlines: Your Tuesday Briefing
articles: Britain sizzles under a heat wave
  
  Temperatures in Britain neared a record high yesterday as blistering heat swept the country. By midafternoon, Wales had recorded its highest-ever temperature: The thermometer hit 37.1 degrees Celsius, almost 99 degrees Fahrenheit.
  
  Infrastructure is under strain. Some train services were canceled, while others were running at reduced speeds in case the tracks buckled. Flights at Britain’s largest air base were halted over fears that the tar could melt. And the chains of a Victorian-era bridge were wrapped in foil to keep cracks from expanding and threatening the bridge’s stability.
  
  Global warming has exacerbated Europe’s heat waves, which scientists say are increasing in frequency and intensity at a faster rate than in almost any other part of the planet. So have changes in the jet stream, scientists say.