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The Chicago area saw its third consecutive day of triple-digit temperatures Friday, a triad of scorchers only seen twice before in the city's history.

The National Weather Service forecast a high of 103 degrees Friday, the same as the high temperature the city hit Thursday, ABC Chicago reports.

The thermometer hit 103 degrees Friday at O'Hare in Chicago, topping the previous record high temperature for the day: 99 degrees, set in 1988.

The temperature registered only two degrees short of the highest temperature ever recorded in Chicago -- 105 degrees, set on July 24, 1934.

The heat has contributed to at least two deaths to date in Cook County, the Chicago Tribune reported early Friday, as the city prepared for its seventh consecutive day of 90-plus degree weather.

The Sun-Times reported late Friday afternoon that the number of heat-related deaths countywide was up to six this week.

An excessive heat warning for much of the Chicago area has been extended through 4 p.m. Saturday afternoon when a cooler front will move into the area, bringing with it some long-awaited relief.

The heat led to the cancelation of all regularly scheduled Chicago Public Schools summer classes and sports activities Friday, NBC Chicago reports, marking for the second day in a row that CPS classes were canceled due to the weather.

The sweltering conditions have also contributed to roads buckling throughout the area, including one in Chicago's South Loop, the Chicago Sun-Times reports.

Area residents are encouraged to check on their neighbors, especially the elderly and others susceptible to the extreme conditions. Those without air conditioning are urged to go to a cooling center -- such as a public library or police station -- to help them beat the heat.

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  • People enjoy in the Lake Michigan at North Beach in Chicago, Thursday, July 12, 2012. The Chicago area headed for another 90-degree high away from Lake Michigan Thursday afternoon. It marks the 26th time this year that area temperatures have surged to such levels. (AP Photo/Nam Y. Huh)

  • A couple enjoy swimming in the Lake Michigan at North Beach in Chicago, Thursday, July 12, 2012. The Chicago area headed for another 90-degree high away from Lake Michigan Thursday afternoon. It marks the 26th time this year that area temperatures have surged to such levels. (AP Photo/Nam Y. Huh)

  • People enjoy beach volleyball at North Beach in Chicago, Thursday, July 12, 2012. The Chicago area headed for another 90-degree high away from Lake Michigan Thursday afternoon. It marks the 26th time this year that area temperatures have surged to such levels. (AP Photo/Nam Y. Huh)

  • Jake Wenz, 12, jumps off the high board at Centennial Beach in Naperville, Ill. on Friday July 6, 2012. There's been no relief day or night from a scorching heat wave in the central U.S., and the deadly temperatures were heading east Friday after Midwest cities like Chicago, St. Louis and Milwaukee set record highs. (AP Photo/Daily Herald,Bev Horne)

  • Hope Olin gives Addison Olin, 4, lots of sunscreen at Centennial Beach in Naperville, Ill. on Friday, July 6, 2012. There's been no relief day or night from a scorching heat wave in the central U.S., and the deadly temperatures were heading east Friday after Midwest cities like Chicago, St. Louis and Milwaukee set record highs. (AP Photo/Daily Herald,Bev Horne)

  • Despite triple digit temperatures and having an air conditioned apartment, eighty-year-old William Holman makes several trips a day to the courtyard at Apartamentos Las Americas to visit with his neighbors and catch some fresh air. Holman sat outside with friends as The Chicago Housing Authority conducted well-being checks on its frail and elderly residents in the building Friday, July 6, 2012, in Chicago. The CHA has made almost 44,000 since Chicago

  • A worker at an ice manufacturing company helps a customer load his car with ice Friday, July 6, 2012 in Chicago. An extreme heat warning due to expire Friday evening was extended an extra day as the city endured its third consecutive day of temperatures over 100 degrees. (AP Photo/Sitthixay Ditthavong)

  • A fan cools off in a shower behind the outfield before a baseball game between the Chicago White Sox and the Toronto Blue Jays in Chicago, Friday, July 6, 2012. (AP Photo/Nam Y. Huh)

  • Central Illinois cattle keep cool by wading into a farm pond during a record breaking heat wave with dry weather conditions that is across most of the country Friday, July 6, 2012 in Farmingdale, Ill. There's been no relief day or night from a scorching heat wave in the central U.S., and the deadly temperatures were heading east Friday after Midwest cities like Chicago, St. Louis and Milwaukee set record highs. (AP Photo/Seth Perlman)

  • From left,Amelia Schendel, her sister Alison Schendel and Madeline Ahern, all on vacation from Minnesota, enjoy the cool water on a hot summer day at Crown Fountain in Chicago's Millennium Park, Wednesday, June 27, 2012. Temperatures in Illinois are forecast to top 100 degrees by Thursday, and authorities are urging the public to be cautious. (AP Photo/Sitthixay Ditthavong)

  • Children enjoy the cool water on a hot summer day at Crown Fountain in Chicago's Millennium Park on Wednesday, June 27, 2012. Temperatures in Illinois are forecast to top 100 degrees by Thursday, and authorities are urging the public to be cautious. (AP Photo/Sitthixay Ditthavong)

  • Men who identified themselves as Papa B, left, and Cadillac Bob, find refuge from the heat in a shaded lot between their homes Thursday, July 5, 2012 on Chicago's south side. Chicago hit 103 degrees as oppressive heat slams the middle of the country with record high temperatures that aren't going away after the sun goes down. (AP Photo/Sitthixay Ditthavong)

  • A child plays in the spray of an open fire hydrant Thursday, July 5, 2012 on Chicago's south side. Chicago hit 103 degrees as oppressive heat slams the middle of the country with record temperatures that aren't going away after the sun goes down. (AP Photo/Sitthixay Ditthavong)

  • A young man bikes through the spray of an open fire hydrant Thursday, July 5, 2012 on Chicago's south side. Chicago hit 103 degrees as oppressive heat slamms the middle of the country with record temperatures that aren't going away after the sun goes down. (AP Photo/Sitthixay Ditthavong)

  • Ben Pain, Dennis White Jack Willis

    From left, Ben Pain, Dennis White, and Jack Willis take a break from renovating a residence during a heat wave Thursday, July 5, 2012, on Chicago's south side. Chicago hit 103 degrees as oppressive heat slams the middle of the country with record temperatures that aren't going away after the sun goes down. (AP Photo/Sitthixay Ditthavong)

  • Children play in the spray of an open fire hydrant Thursday, July 5, 2012 on Chicago's south side. Chicago hit 103 degrees as oppressive heat slams the middle of the country with record temperatures that aren't going away after the sun goes down. (AP Photo/Sitthixay Ditthavong)

  • Baseball fans watch the Texas Rangers play against the Chicago White Sox during the second inning of a baseball game in Chicago, Thursday, July 5, 2012. (AP Photo/Nam Y. Huh)

  • A baseball fan wipes his face as he holds an umbrella in the stands as he watches the Texas Rangers play against the Chicago White Sox during the second inning of a baseball game in Chicago, Thursday, July 5, 2012. (AP Photo/Nam Y. Huh)

  • Larry Halliburton, left, and Stoney Burke of the Chicago Chapter of the Buffalo Soldiers seek refuge from the 100 degree heat after participating in the annual Hyde Park Independence Day parade Wednesday, July 4, 2012 in Chicago. (AP Photo/Sitthixay Ditthavong)

  • A young man finds relief from the 90 plus degree heat in the spray of an open fire hydrant, Tuesday, July 3, 2012, on Chicago's west side. Record high temperatures continue to engulf a vast portion of the nation with little relief in sight. (AP Photo/M. Spencer Green)

  • FILE - In this June 28, 2012 file photo, from left, construction workers Santiago Gomez, Jorge Moreno, Abel Lozano take a break from the upper 90 degree heat during a road construction project in downtown Chicago. While June was extremely hot month with an average temperature across the state at 72.9 degrees. State Climatologist Jim Angel points out that it wasn't the hottest June ever. Not even close. The year 1934 had that beat with an average temperature of 78.5. (AP Photo/Sitthixay Ditthavong, File)

  • A woman fans herself on a hot and humid day during the New York Yankees baseball game against the Chicago White Sox at Yankee Stadium in New York, Sunday, July 1, 2012. (AP Photo/Kathy Willens)

  • In this Thursday, June 28, 2012 photo provided by the Chicago Zoological Society, Aussie, a 27-year-old polar bear at the Brookfield Zoo in Brookfield, Ill., cools off with a large block of ice in his pool as temperatures hovered near the 100 mark. (AP Photo/Chicago Zoological Society, Jim Schulz)

  • In this Thursday, June 28, 2012 photo provided by the Chicago Zoological Society, Honey, a 2-year-old American Guinea hog at the Brookfield Zoo in Brookfield, Ill., cools off in a pool of water as temperatures hovered near the 100 mark. (AP Photo/Chicago Zoological Society, Jim Schulz)

  • Young Reece Hope takes a drink of the cool water at Crown Fountain in Chicago's Millennium Park on a warm summer day Wednesday, June 27, 2012. Temperatures in Illinois are forecast to top 100 degrees by Thursday, and authorities are urging the public to be cautious. (AP Photo/Sitthixay Ditthavong)

  • Children enjoy the cool water on a hot summer day at Crown Fountain in Chicago's Millennium Park on Wednesday, June 27, 2012. Temperatures in Illinois are forecast to top 100 degrees by Thursday, and authorities are urging the public to be cautious. (AP Photo/Sitthixay Ditthavong)

  • Chicago area senior citizen Elbert Brown, 63, escapes the summer heat with a free lunch at a city cooling center Thursday, June 28, 2012 in Chicago. Temperatures are forecasted to climb near the record of 101 degrees. (AP Photo/Charles Rex Arbogast)

  • Chicago area senior citizens escaping the summer heat in a city cooling center watch a live broadcast of President Barack Obama's reaction to the Supreme Court's decision to uphold his health care law Thursday, June 28, 2012 in Chicago. (AP Photo/Charles Rex Arbogast)