According to the National Climate Assessment, the most extreme precipitation events (those in the 99th percentile of intensity) have increased in every region of the contiguous states since the 1950s. In the U.S., the highest precipitation events seem to be occurring more in the Northeast and across the Midwest. Image via National Climate Assessment
Depending on where you live, you could call 2014 the year of the drought, or the year of the deluge. In early August 2014, we have seen several significant rainfall events occur across the United States. During the week of August 10, for example, a slow moving area of low pressure across the Great Lakes and New England produced widespread showers and storms. Yesterday (August 19), parts of Phoenix (yes, the desert) recorded over four inches of rain in a short time period, thanks to an upper level low pushing into the western United States. Are extreme rainfall events related to climate change, and/or has urban sprawl contributed to flash flooding events due to more concrete and poor sewer systems? The answers to both questions are probably yes.
FULL STORY, PHOTOS, VIDEOS OF FLOODING AROUND THE U.S.: http://earthsky.org/earth/unusual-precipitation-patterns-in-the-u-s?utm_source=EarthSky+News&utm_campaign=65fa9730ca-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-65fa9730ca-307928925
aggregating, are not equipped to handle large volumes of water due to outdated storm water management, impervious surfaces, lack of vegetation, etc. Unfortunately, that leads to major flooding over a short period.
Dr. Marshall Shepherd