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34 <br />33 <br />32 <br />35 <br />3,0 <br />28 <br />27 <br />25 <br />IIP're cii piit :w t:iiiii on Trends over 30- Ye r Climate II ormal Periods <br />9,1 - 11 9 - 1:9 <br />all <br />Average annual fed Atation li s <br />liincreasliin, at ap ro iiu mat.ell. U0.31 <br />incheserdecade. <br />19 .-195 1931 .9 .941- .970 195 -19,. <br />19 6 -.19 9 1-. 0 <br />1 <br />1981-201 <br />Figure 2-1 Trends in Average Annual Precipitation (Twin Cities Region) <br />1 <br />The study of long-term extreme weather trends found that precipitation amounts are predicted to <br />increase significantly over what is historically used in floodplain assessments and infrastructure design. <br />Recent work completed by the University of Minnesota (Moore et al., 2016) provides information useful to <br />consider long-term extreme weather trends in the region. A range of estimates for the mid-21 st century <br />100-year 24-hour rainfall event were identified. The lower estimate for the mid-21 st century 100-year, <br />24-hour rainfall estimate was approximately 7.3 inches, which is similar to the current mean 100-year <br />rainfall depth published in Atlas 14 (7.8 inches). The middle estimate is 10.2 inches, which is similar to the <br />upper limits of the Atlas 14 90-percent confidence limits for the 100-year rainfall depth (10.4 inches). <br />Upper estimates of mid-21 st century 100-year 24-hour rainfall exceed the 90-percent confidence limits of <br />Atlas 14. <br />Additional information about climate change is available from the Minnesota Department of Natural <br />Resources (MDNR) at: tt s:// nr.st t* s/cli .:te/cli t c f•/' • -x. t <br />2-4 <br />