I have seen articles blaming this on La Nina. Well, there is a La Nina every few years. That doesn't explain whey they are getting worse. This is exactly what was predicted decades ago by climate scientists.
http://www.wunderground.com/blog/JeffMasters/comment.html?entrynum=1843
June 2011: another month of exceptional extremes for the U.S.
Posted by: JeffMasters, 2:24 PM GMT on July 11, 2011
June 2011 was another month of remarkable extremes over the U.S. Overall, it was the 26th warmest and 19th driest June for the lower 48 states, according to the National Climatic Data Center. Extreme heat gripped much of the South, with Texas experiencing its hottest June on record, and 13 other states recording top-ten hottest Junes. Accompanying the heat was intense drought--New Mexico had its driest June on record, and four other states had top-ten driest Junes. While the southern Plains' 1950s drought of record is unsurpassed in terms of duration, the current drought in parts of Texas is more intense than the 1950s drought when measured by the Palmer Hydrological Drought Index. The heat and drought contributed to the worst fire year in U.S. history, with 4.8 million acres burned by the end of the month, more than double the average from the previous ten years.
While the South baked and burned, California experienced its wettest June on record, and heavier than normal precipitation and prolonged snowmelt during the spring caused June flooding in Idaho, Montana, North Dakota, Utah, and Washington. For the 3-month period April-May-June, the NOAA Climate Extremes Index indicated that it was the most extreme such period on record in the U.S. for precipitation, as measured by the percent area of the U.S. experiencing top 10% wettest or driest conditions. Heavy 1-day precipitation events were also at an all-time high during April-May-June 2011. Data for the Climate Extremes Index goes back to 1910.
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