extreme heat is a problem here as well as in europe. reporter: a fire rages threw a field in spain as homes burn. in greater london, a house is swallowed by wildfire. these just some of the many sweeping across europe why temperatures have soared in a heat emergency that stretches across the globe. china s heat wave began last week with 51 cities, including beijing, now under the second highest heat alert level. european cities sweltered under new highs in what is the continent s second heat wave of the summer, now entering its second week. ireland seeing its hottest day in a century. in the united kingdom, temperatures reached 104 degrees. a first. with london s fire brigade declariing a major incident because of a huge surge in fires across the capital. we have to adopt. our homes have to change. our way of life has to change.
under heat advisories or warnings. and incredible heat in the southern plains now makes its way into tennessee, ohio valley, to the northeast, larger populated cities antz the outlook for youall 6 nof next w is above average. wednesday expect 100 degrees in parts of the northeast and heat advisories for philadelphia, new york and boston which has declared a heat emergency. this issers heat and we re really concerned about those particularly with pre-existing respiratory conditions. reporter: cities from sacramento to d.c. offering cooling centers and splash parks. doctors say avoid the heat and drink plenty of fluids. wear loose fitting clothes, light clothing, things that are breathable such as cotton and linen. and keep well hydrated and wear wide brim hats and try to stay in the shade. reporter: one town in arkansas losing power following a wind storm when temperatures
cities like miami and phoenix are nowheat officers to deal with the crisis. and here is the director of heat response investigation in phoenix talking about the dangers of extreme heat. heat can affect everyone. we re all at risk. and unfortunately, one of the first symptoms of heat exhaustion is that we become a little disoriented, a little confused. so please trust your body if you are feeling any suggestion that you might be in trouble, take it easy, find a way to take a break. reporter: now that heatwave has reached the northeast where we could see record highs the next several days. heat advisory rsz in effect today in philadelphia, here in new york city and in boston. boston s mayor might bchelle wu declaring a heat emergency. and the heat index, the heat plus the humidity, that could be near 100 degrees.
stay safe. right now more than 100 million americans are under extreme weather alerts. and 265 million are facing it is upwards of 90 degrees farenheit which is 32 in celsius. central plain citys in oklahoma and texas are getting the worst of it, they could see 115 degrees. and in many areas people are doing whatever they can to cool down. boston has already declared a heat emergency and in toronto, canada, swimming pool hours are being extended until almost midnight. those who can are cranking up the air conditioning and that is putting enormous strain on some of the power grids. texas set a new record for energy demand on tuesday and yet another is expected today. but further west in arizona, thousands of people lost power due to strong storms and the communities affected were dealing with temperatures of around 108 degrees farenheit. authorities there distributed ice and opened cooling stations, much of the relief to overheated