Computer model projection of temperature anomalies across Europe on June 27. Temperature scale in °C. Image:

Air imported directly from the Sahara Desert into Western Europe will result in a record-shattering heat wave this week that could break all-time monthly temperature records in some locations, including Spain, France, Belgium, Germany, Poland and Denmark.

Why it matters: An extended heat wave at the start of summer is a threat to public health, since people are not yet accustomed to such high temperatures, making them more susceptible to heat-related illnesses. Europe has a history of deadly heat events in recent years. In 2003, for example, an August heat wave contributed to as many as 70,000 excess deaths, primarily in France, and became the first extreme weather event to be conclusively tied to human-caused global warming.

Details: Temperatures will climb into the mid-to-upper 30s°C, or upper 90s°F, across Spain, Portugal and France by Tuesday, and could exceed 40°C, or 104°F, by mid-to-late week in a wide swath of Western Europe. Weather agencies have hoisted warnings in multiple countries, and public officials are taking steps to open cooling centers in cities such as Paris to ensure residents have access to air conditioning.

  • Popular tourist destinations such as Madrid, Barcelona, Paris, London, Rome, Berlin, Brussels and Amsterdam will be affected by this heat wave, which is likely to peak late in the week but may continue through the weekend.
  • The heat in Paris could affect the Women's World Cup, which runs through early July.
  • Accompanying the hot weather will be a chance for severe thunderstorms.
  • Stalled and unusually strong areas of high pressure — known as "blocking highs" — over Greenland and Europe will act to prevent weather systems from moving cooler air into Europe until at least early next week.
  • Climate change may be increasing the odds of such blocking patterns.

Between the lines: Heat waves of exceptional magnitude and duration are one of the clearest manifestations of human-caused global warming. Numerous scientific studies have tied increases in heat wave frequency, severity and duration to emissions of greenhouse gases from the burning of fossil fuels.

  • By raising background average temperatures, climate change is dramatically increasing the risk of extremely warm temperatures.
  • A study published this month in the journal Earth's Future found that multiple heat waves around the Northern Hemisphere during the summer of 2018 "would not have occurred without human-induced climate change." Some spots that were hit last year could be affected by the latest event.

Climate scientists warn that heat waves will dramatically worsen if countries do not slash greenhouse gas emissions in the near future.

  • The new study, for example, projects summer heat waves of a magnitude and scope similar to 2018 will occur every year if climate change reaches 2°C, or 3.6°F, above preindustrial levels by the year 2100.
  • Currently, temperatures are on course to rise more than 3°C, or 5.4°F, by 2100 based on recent emissions trends.

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Robert Mueller speaks out on Roger Stone commutation

Former Special Counsel Robert Mueller testifies before the House Permanent Select Committee on Intelligence on Capitol Hill on Wednesday July 24, 2019. Photo: The Washington Post / Contributor

Former special counsel Robert Mueller responded to claims from President Trump and his allies that Roger Stone was a "victim" in the Justice Department's investigation into Russian interference in the 2016 election, writing in a Washington Post op-ed published Saturday: "He remains a convicted felon, and rightly so."

Why it matters: The rare public comments by Mueller come on the heels of President Trump's move to commute the sentence of his longtime associate, who was sentenced in February to 40 months in prison for crimes stemming from the Russia investigation. The controversial decision brought an abrupt end to the possibility of Stone spending time behind bars.

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President Trump wore a face mask during his Saturday visit to Walter Reed National Military Medical Center, according to AP.

Why it matters: This is the first known occasion the president has appeared publicly with a facial covering as recommended by health officials since the coronavirus pandemic began, AP writes.

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