Visitors to the annual horseracing event, the Birdsville Races, walk under heavy rain clouds in the outback town of Birdsville on September 1, 2016. The downpour has threatened to postpone the races which sees the small town population of 115 people swell to 7,000 during the two-day event but bad weather has already hampered the turnout this year with the first heavy rain for decades. / AFP PHOTO / PETER PARKSPETER PARKS/AFP/Getty Images

Visitors to the annual horseracing event, the Birdsville Races, drink beer at the local pub as heavy rain falls in the outback town of Birdsville on September 1, 2016. The downpour has threatened to postpone the races which sees the small town population of 115 people swell to 7,000 during the two-day event but bad weather has already hampered the turnout this year with the first heavy rain for decades. / AFP PHOTO / PETER PARKSPETER PARKS/AFP/Getty Images

Visitors to the annual horseracing event, the Birdsville Races, walk along a road as heavy rain falls in the outback town of Birdsville on September 1, 2016. The downpour has threatened to postpone the races which sees the small town population of 115 people swell to 7,000 during the two-day event but bad weather has already hampered the turnout this year with the first heavy rain for decades. / AFP PHOTO / PETER PARKSPETER PARKS/AFP/Getty Images

This August 30, 2016 NASA satellite image shows Hurricanes Lester(R) (13E) and Madeline (14E) in the Pacific Ocean. Hurricane Madeline flexed its muscles as it churned towards Hawaii Tuesday, peaking at a dangerous Category Four strength before slackening, US weather officials said. The storm, which is expected to pass near Hawaii's Big Island sometime Wednesday, has the potential to unleash dangerous flash floods and mudslides, the Central Pacific Hurricane Center said.At 0900 GMT August 31, Madeline was a Category One storm with maximum sustained winds around 90 miles (145 kilometers) per hour with higher gusts. / AFP PHOTO / NASA / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO /NASA" - NO MARKETING - NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

This color-enhanced infrared image obtained August 31, 2016 and captured by the VIIRS instrument aboard the NOAA/NASA Suomi NPP satellite on the evening of August 29, 2016, shows major Hurricane Madeline approaching Hawaii from the east. Hurricane Madeline showed power as it churned toward Hawaii on August 30, 2016, peaking at a dangerous Category Four strength before slackening, US weather officials said.The storm, which is expected to pass near Hawaii's Big Island sometime August 31, 2016, has the potential to unleash dangerous flash floods and mudslides, the Central Pacific Hurricane Center said. / AFP PHOTO / NOAA-NASA / HO / RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / NOAA-NASA" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS HO/AFP/Getty Images

LONDON, ENGLAND - AUGUST 31: A girl dives in as she enjoys a swim at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - AUGUST 31: A woman keeps warm under towels and a blanket after swimming at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)

LONDON, ENGLAND - AUGUST 31: A man rests as he enjoys a swim at Kings Cross Pond Club on August 31, 2016 in London, England. Swimmers took advantage of the clement weather by exercising and relaxing at the inner city outdoor pool. (Photo by Carl Court/Getty Images)