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Thursday, August 9, 2012

Torrid Heat, Drought and The Overwhelmingly Likelihood of Global Warming


From Ezra Klein's "WonkBook"


July was the hottest month ever in the U.S.“It may come as little surprise to the nation's corn farmers or resort operators, but the official statistics are in: July was the hottest month in the lower 48 states since the government began keeping temperature records in 1895. The average temperature last month was 77.6 degrees — 3.3 degrees above the average 20th-century temperature, the National Oceanic and Atmospheric Administration reported on Wednesday. July thereby dethroned July 1936, which had set the record at 77.4 degrees, the agency said…A hot July also contributed to the warmest 12-month period ever recorded in the United States, the statistics showed. Climatologists at the agency noted that by the end of the month, about 63 percent of the nation was experiencing drought conditions, which contributed to the high temperatures.” Joanna Foster in The New York Times.

There have already been more record temperatures than all of last year. “Thanks to a record warm January-to-June period and intense, long-lasting heat waves during March, June, and July, the U.S. has passed an ominous milestone: with about five months remaining in the year, there have already been more record daily high temperatures set or tied so far this year than were set or tied during all of 2011. And 2011 had the second-warmest summer on record for the lower 48 states. According to Guy Walton of The Weather Channel, who compiles temperature record statistics using data from the National Climatic Data Center, there were 26,674 daily record highs broken or tied during 2011, and through August 5 there were 27,042 records broken or tied this year. The March and July heat waves clearly gave 2012 the edge over last year. During March alone, 7,755 daily records were set or tied, and 4,420 records were broken or tied during July.”Andrew Freedman in Climate Central.

How droughts will reshape the United States: http://wapo.st/PD9Sey.

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