Query: North America suffers extreme weather events including wildfires, drought, and heatwaves.

Relevant passages:
Heat wave <=SEP=> A heat wave is a prolonged period of excessively hot weather , which may be accompanied by high humidity , especially in oceanic climate countries . While definitions vary , a heat wave is measured relative to the usual weather in the area and relative to normal temperatures for the season . Temperatures that people from a hotter climate consider normal can be termed a heat wave in a cooler area if they are outside the normal climate pattern for that area .   The term is applied both to hot weather variations and to extraordinary spells of hot which may occur only once a century . Severe heat waves have caused catastrophic crop failures , thousands of deaths from hyperthermia , and widespread power outages due to increased use of air conditioning . A heat wave is considered extreme weather , and a danger because heat and sunlight may overheat the human body .

Extreme weather <=SEP=> Extreme weather includes unexpectable , unusual , unpredictable severe or unseasonal weather ; weather at the extremes of the historical distribution -- the range that has been seen in the past . Often , extreme events are based on a location 's recorded weather history and defined as lying in the most unusual ten percent . In recent years some extreme weather events have been attributed to human-induced global warming , with studies indicating an increasing threat from extreme weather in the future .

2014 California wildfires <=SEP=> The 2014 California wildfire season saw several notable wildfires ignited in the state of California , especially during the month of May , when multiple fires were ablaze concurrently in Southern California , and during September , when several massive wildfires were burning in Northern California . In the context of the 2012 -- 15 North American drought ( especially the 2011 -- 15 California drought ) , as well as powerful Santa Ana winds , weather conditions were ideal for wildfires . The season began unusually early when a wildfire ignited on January 1 , followed by 6 more fires igniting later within the same month . During a heat wave and dry Santa Ana conditions in May 2014 , multiple wildfires broke out simultaneously in San Diego County , along with several other wildfires elsewhere in California . By mid-May , fire officials said they had already dealt with 1,400 wildfires in California in 2014 - twice the normal amount for that time of year - and a spokesman for CAL FIRE described the conditions as `` unprecedented . '' The May 2014 San Diego County wildfires were estimated to have caused at least $ 60 million ( 2014 USD ) in damage . In late June to early August , another group of wildfires ignited across the state , some of which reached over twenty thousand acres in size . In mid-September , the largest group of wildfires erupted , with some wildfires becoming larger than 50,000 acres in size . In early September 2014 , the Happy Complex Fire became the largest wildfire of the season , eventually topping out at 135369 acres in size on September 27 . On October 8 , an aerial tanker crashed during a firefighting effort at the Dog Rock Fire , which killed the pilot and sparked a small wildfire . From late September to late October , the latest flare-up of major wildfires were extinguished by cooler weather and precipitation . From December 10 -- 13 , a powerful winter storm extinguished the remaining wildfires that were present . In mid-December through late December , several more small wildfires sparked , but they were all extinguished by December 31 . A total of 5,620 wildfires ignited throughout the year , which burned at least 631434 acres of land . The wildfires caused a total of 146 injuries and 2 fatalities , in addition to causing at least $ 184.02 million ( 2014 USD ) in damage .

2010 Northern Hemisphere heat waves <=SEP=> The 2010 Northern Hemisphere summer heat waves included severe heat waves that impacted most of the United States, Kazakhstan, Mongolia, China, Hong Kong, North Africa and the European continent as a whole, along with parts of Canada, Russia, Indochina, South Korea and Japan during May, June, July, and August 2010. The first phase of the global heatwaves was caused by a moderate El Niño event, which lasted from June 2009 to May 2010. The first phase lasted only from April 2010 to June 2010, and caused only moderate above average temperatures in the areas affected. But it also set new record high temperatures for most of the area affected, in the Northern Hemisphere. The second phase (the main, and most devastating phase) was caused by a very strong La Niña event, which lasted from June 2010 to June 2011. According to meteorologists, the 2010–11 La Niña event was one of the strongest La Niña events ever observed. That same La Niña event also had devastating effects in the Eastern states of Australia. The second phase lasted from June 2010 to October 2010, caused severe heat waves, and multiple record-breaking temperatures. The heatwaves began on April 2010, when strong anticyclones began to develop, over most of the affected regions, in the Northern Hemisphere. The heatwaves ended in October 2010, when the powerful anticyclones over most of the affected areas dissipated. The heat wave during the summer of 2010 was at its worst in June, over the Eastern United States, Middle East, Eastern Europe and European Russia, and over Northeastern China and southeastern Russia. June 2010 marked the fourth consecutive warmest month on record globally, at 0.66 °C (1.22 °F) above average, while the period April–June was the warmest ever recorded for land areas in the Northern Hemisphere, at 1.25 °C (2.25 °F) above average. The previous record for the global average temperature in June was set in 2005 at 0.66 °C (1.19 °F), and the previous warm record for April–June over Northern Hemisphere land areas was 1.16 °C (2.09 °F), set in 2007. The strongest of the anticyclones, the one situated over Siberia, registered a maximum high pressure of 1040 millibars. The weather caused forest fires in China, where three in a team of 300 died fighting a fire that broke out in the Binchuan County of Dali, as Yunnan suffered the worst drought in 60 years by February 17. A major drought was reported across the Sahel as early as January. In August, a section of the Petermann Glacier tongue connecting northern Greenland, the Nares Strait and the Arctic Ocean broke off, the biggest ice shelf in the Arctic to detach in 48 years. By the time the heatwaves had ended in late October 2010, about $500 billion (2011 USD) of damage was done, in the Northern Hemisphere alone. The World Meteorological Organization stated that the heat waves, droughts and flooding events fit with predictions based on global warming for the 21st century, include those based on the Intergovernmental Panel on Climate Change's 2007 4th Assessment Report. Some climatologists argue that these weather events would not have happened if the atmospheric carbon dioxide was at pre-industrial levels.