Spatiotemporal Analysis of Extreme Precipitation in the Missouri River Basin from 1950 – 2019

Abstract Extreme precipitation events are challenging to local and regional stakeholders across the United States. The Missouri River Basin (MoRB), covering an area over 1.29 million km 2 , is prone extreme events. These exacerbated by complex terrain in west numerous weather climate features which impact region on a seasonal/annual basis (low-level jets, mesoscale convective systems, cold air intrusions, etc.). Without in-depth analysis of MoRB, evolving nature not known. This warrants precipitation, especially relating sub-annual variations when more impactful. To this end, data from 131 States Historical Climatology Network (USHCN) stations were used determine 1950 – 2019. Annual 99th percentile annual station maximum occur frequently eastern MoRB than western line with climatology. Results show that becoming frequent MoRB. Through 3-month trends, areas southern shown have increasing event frequency intensity. Frequency shifts events, however, occurred entire region. represent significant change for hydroclimate Overall, results work MORB has increased intensity during 2019 period.