Borussia Dortmund supporters enjoy the sunny weather during a boat trip at the river Spree ahead the German Cup (DFB Pokal) final football match Bayern Munich vs Borussia Dortmund in Berlin on May 21, 2016. / AFP PHOTO / CHRISTOF STACHECHRISTOF STACHE/AFP/Getty Images

Borussia Dortmund supporters enjoy the sunny weather during a boat trip at the river Spree ahead the German Cup (DFB Pokal) final football match Bayern Munich vs Borussia Dortmund in Berlin on May 21, 2016. / AFP PHOTO / CHRISTOF STACHECHRISTOF STACHE/AFP/Getty Images

Borussia Dortmund supporters enjoy the sunny weather during a boat trip at the river Spree ahead the German Cup (DFB Pokal) final football match Bayern Munich vs Borussia Dortmund in Berlin on May 21, 2016. / AFP PHOTO / CHRISTOF STACHECHRISTOF STACHE/AFP/Getty Images

An independent searcher controls a drone during an experimental flight to make searches on the atmosphere, on May 20, 2016 in the Centre of Atmospheric Research (Recherche Atmosphérique - CRA) in Lannemezan in the French Pyrenees. The goal is to test new drones with new weather forecast sensors by flying close to a 60m mast equipped with reference sensors (temperature, humidity, wind) and to exchange experiences in a way to progress in this new area. / AFP PHOTO / REMY GABALDAREMY GABALDA/AFP/Getty Images

An independent searcher looks at a computer as a drone flies during an experimental flight to make searches on the atmosphere, on May 20, 2016 in the Centre of Atmospheric Research (Recherche Atmosphérique - CRA) in Lannemezan in the French Pyrenees. The goal is to test new drones with new weather forecast sensors by flying close to a 60m mast equipped with reference sensors (temperature, humidity, wind) and to exchange experiences in a way to progress in this new area. / AFP PHOTO / REMY GABALDAREMY GABALDA/AFP/Getty Images

TOPSHOT - Sri Lankan flood victims push a trishaw through floodwaters in the Kolonnawa suburb of Colombo on May 21, 2016. Foreign aid began arriving in Sri Lanka on May 21, bringing help to half a million people forced out of their homes by heavy rains and landslides that have killed at least 71 in a week of extreme weather wreaking havoc in South Asia. / AFP PHOTO / LAKRUWAN WANNIARACHCHILAKRUWAN WANNIARACHCHI/AFP/Getty Images

Sri Lankas Finance Minister Ravi Karunanayake (C) visits the flooded Kolonnawa suburb of Colombo on May 21, 2016. Foreign aid began arriving in Sri Lanka on May 21, bringing help to half a million people forced out of their homes by rains and landslides that have killed at least 71 in a week of extreme weather wreaking havoc in South Asia. / AFP PHOTO / ISHARA S.KODIKARAISHARA S.KODIKARA/AFP/Getty Images

A Sri Lankan navy soldier throws bottles of drinking water to a flood victim in the Kolonnawa suburb of Colombo on May 21, 2016. Foreign aid began arriving in Sri Lanka on May 21, bringing help to half a million people forced out of their homes by rains and landslides that have killed at least 71 in a week of extreme weather wreaking havoc in South Asia. / AFP PHOTO / ISHARA S.KODIKARAISHARA S.KODIKARA/AFP/Getty Images