21 July 2011 Last updated at 14:53 GMT 
Across the US, people found ways to keep cool - like standing in front of a mist spray
As much as 50% of the US population was under a heat advisory, officials said.
Meteorologists have put the temperatures down to a "dome" of high pressure in the atmosphere.
Across the central and eastern US, people and animals alike are struggling to keep cool amid the oppressive heat and humidity.
In Minnesota - a northern state known for its frigid winters - farm livestock died from heat stress at a rate not seen in three decades, the Minneapolis Star Tribune newspaper reported. Turkeys were hit especially hard, the paper reported.
In South Dakota, as many as 1,500 head of cattle have died in the heat, state veterinarian Dustin Oedekoven told Reuters.
Urban areas have opened cooling centres for the poor and elderly and the National Weather Service has warned people in normally cool areas to be especially cautious.
Philadelphia has deployed police officers to manage hot, irritated overflow crowds at the city's public swimming pools.
Heat wave spreads across central and eastern US
Across the US, people found ways to keep cool - like standing in front of a mist sprayA punishing heat wave has settled over central and eastern parts of the US, pushing temperatures as high as 43C (110F) and causing up to 22 deaths.
The National Weather Service warned of "dangerous" levels of heat and humidity creeping east, with no relief expected in eastern states until Sunday.As much as 50% of the US population was under a heat advisory, officials said.
Meteorologists have put the temperatures down to a "dome" of high pressure in the atmosphere.
Across the central and eastern US, people and animals alike are struggling to keep cool amid the oppressive heat and humidity.
In Minnesota - a northern state known for its frigid winters - farm livestock died from heat stress at a rate not seen in three decades, the Minneapolis Star Tribune newspaper reported. Turkeys were hit especially hard, the paper reported.
In South Dakota, as many as 1,500 head of cattle have died in the heat, state veterinarian Dustin Oedekoven told Reuters.
Urban areas have opened cooling centres for the poor and elderly and the National Weather Service has warned people in normally cool areas to be especially cautious.
Philadelphia has deployed police officers to manage hot, irritated overflow crowds at the city's public swimming pools.
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Heat is the number one killer out of all weather hazards”Eli Jacks National Weather Service
"In places where the highest temperature you ever expect is in the 80s and you're at 102, there are big health concerns," forecaster Eli Jacks told the Associated Press. "Heat is the number one killer out of all weather hazards," he said.
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From other news sites
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Mail Online UK US heat wave: Utilities struggle to meet power demand 1 hr ago
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Charlotte Observer Heat 'dome' makes much of US feel like steam bath 18 hrs ago
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seattlepi.com Heat 'dome' traps rest of country 20 hrs ago
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Reuters UK U.S. crops and cattle stressed by hellish heat 26 hrs ago
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