Europe Swelters in Summer Heat Jul 15, 2017

The US isn’t alone in our sticky summer heat and rampant wildfire season.

June was a scorching month all across Western Europe. As if stifling heat were not enough, the high temperatures combined with dry and windy conditions across the Iberian Peninsula to create the perfect environment for the production and spread of wildfires in Spain and Portugal.

Average temperature anomalies during June 2017 across Europe. Hotter than average conditions prevailed across western Europe. NOAA Climate.gov image using data provided by NOAA’s Climate Prediction Center.

June temperatures averaged at least 3°F above normal for much of Europe. Areas in Spain, France, Italy, and Switzerland observed temperatures that were over 7°F above average during June. Compared to past years, June 2017 was likely France’s second warmest on record after June 2003, Switzerland’s second warmest and the Netherlands warmest June on record.

With monthly temperatures this warm, it is not surprising that certain days during the month also had extremely hot temperatures. On June 21, average nighttime temperatures fell to only 79.5°F (26.4°C) across France, setting a record for hottest June night for the country. In Paris, nighttime low temperatures only fell to 84°F (29°C). The previous record was set the night before on June 20. June 21 was also the hottest first day of summer in France on record. In England, June 21 was the hottest June day in over 40 years. At Heathrow airport in London, temperatures reached 94°F (34.5°C).

Aside from the dangers associated with heat-related illness during heat waves, hot and dry conditions in the summertime can easily turn vegetation into potential kindling, increasing the risk for wildfires. During June in central Portugal, a huge wildfire killed over 60 people and injured 200 more. In southwest Spain on June 24, wildfires were sparked in the Huelva province leading to the displacement of 1500 people and threatening Doñana National Park, a UNESCO World Heritage Site.

Difference from average height of the 500-mb pressure level during June 2017 across Europe. Positive values (browns) reflect higher than average pressure and are generally associated with hotter surface temperatures during the summer. Negative values (blues) reflect lower than average pressure. NOAA Climate.gov image using data from NCEP/NCAR Reanalysis

A large area of anomalously high pressure located over Europe was to blame for the hot temperatures. Clear skies caused by sinking air associated with the high pressure allowed surface temperatures to steadily rise under the June sun.

Courtesy: Climate.gov
Author: Tom Di Liberto

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