heat wave

A plane drops fire retardant over a hot spot on Wednesday, May 14, 2014, in San Marcos, Calif. Wednesday, May 14, 2014, in San Marcos, Calif. Flames engulfed suburban homes and shot up along canyon ridges in one of the worst of several blazes that broke out Wednesday in Southern California during a second day of a sweltering heat wave, taxing fire crews who fear the scattered fires mark only the beginning of a long wildfire season.

AP

A plane drops fire retardant over a hot spot in San Marcos, California. Flames engulfed suburban homes and shot up along canyon ridges in one of the worst of several blazes that broke out in Southern California during another day of a sweltering heat

People sit in the sun in Sheldon Square in west London...People sit in the sun in Sheldon Square in west London July 19, 2013. Britain's first prolonged heatwave in seven years has taken the country by surprise, with rails buckling, shops selling out of electric fans, and scientists estimating the surge in temperature could have caused hundreds of premature deaths.   REUTERS/Paul Hackett   (BRITAIN - Tags: ENVIRONMENT)

Paul Hackett/Reuters

People sit in the sun in Sheldon Square in west London on Friday. Britain’s first prolonged heatwave in seven years has taken the country by surprise, with rails buckling, shops selling out of electric fans, and scientists estimating the surge in temperature could have caused hundreds of premature deaths. 

Two boys hang from a metal railing on a bridge before jumping into the Pasig River below in Manila on April 19, 2013.  The Philippines has been experiencing the hottest days of the year with temperatures of 35 degrees Celsius (95 Fahrenheit) recorded in parts of the city.

Noel Celis/AFP

Two boys hang from a metal railing on a bridge before jumping into the Pasig River below in Manila on Friday. The Philippines has been experiencing the hottest days of the year with temperatures of 35 degrees centigrade recorded in parts of the city.