Spells of heat or rain that lasts for weeks have become [ twice as common since 2000 ]( http://www.theguardian.com/environment/2014/aug/11/extreme-weather-common-blocking-patterns ) , due to measurable changes in the behavior of the jet streams. All this is due to global heating.
Ссылка: https://stallman.org/archives/2014-may-aug.html#12_August_2014_%28Long_spells_of_heat_or_rain%29