May-Jun2016_precip_extremes

Bimonthly daily extremes in excess of the lower estimate for 20-yr events for May-June 2016

May-June 2016 recorded the lowest national tally (6.9% of 900 reporting stations) for this season since 1988, despite a highly significant upward trend (p=99.99%) that amounts to 3.2% per century through 2015. Only one of the regional totals exceeded 10% (13.4% in the Southeast, not even in the top 20 rankings, also with no significant trend to support it). On the other hand, the Southwest tally of 1.6% is the 14th lowest, fitting a long-term downward trend of almost -3%/century that is not yet statistically significant, even including 2016. Three Billion-Dollar Disasters ( https://www.ncdc.noaa.gov/billions/events) associated with severe weather and tornadoes ravaged the Great Plains and Ohio Valley, causing a total of 25 fatalities along with $4B in damages, despite comparatively low 20-yr precipitation extreme counts.