More frequent intense and long-lived storms dominate the springtime trend in central US rainfall

Zhe Feng (), L. Ruby Leung, Samson Hagos, Robert A. Houze, Casey D. Burleyson and Karthik Balaguru
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Zhe Feng: Pacific Northwest National Laboratory
L. Ruby Leung: Pacific Northwest National Laboratory
Samson Hagos: Pacific Northwest National Laboratory
Robert A. Houze: Pacific Northwest National Laboratory
Casey D. Burleyson: Pacific Northwest National Laboratory
Karthik Balaguru: Pacific Northwest National Laboratory

Nature Communications, 2016, vol. 7, issue 1, 1-8

Abstract: Abstract The changes in extreme rainfall associated with a warming climate have drawn significant attention in recent years. Mounting evidence shows that sub-daily convective rainfall extremes are increasing faster than the rate of change in the atmospheric precipitable water capacity with a warming climate. However, the response of extreme precipitation depends on the type of storm supported by the meteorological environment. Here using long-term satellite, surface radar and rain-gauge network data and atmospheric reanalyses, we show that the observed increases in springtime total and extreme rainfall in the central United States are dominated by mesoscale convective systems (MCSs), the largest type of convective storm, with increased frequency and intensity of long-lasting MCSs. A strengthening of the southerly low-level jet and its associated moisture transport in the Central/Northern Great Plains, in the overall climatology and particularly on days with long-lasting MCSs, accounts for the changes in the precipitation produced by these storms.

Date: 2016
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DOI: 10.1038/ncomms13429

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