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Sherburne County Multi -Hazard Mitigation Plan, 2020 <br />To determine the probability of future hail events in Sherburne County, all past -observed hail events <br />and the period in which they occurred are examined. Based on the records in the NCEI Storm Events <br />Database, the relative frequency of hail events in the County is 2.3 events per year. This relative <br />frequency can be used to infer the probability of these events occurring in the future. <br />Severe hailstorms (hail greater than 1") are mapped in Figure g. Table 19 shows storms producing hail <br />greater than 1-inch diameter in Sherburne County. <br />Table 19. Storms producing hail greater than 1-inch diameter in Sherburne County, 1950-July 2019 <br />�.il <br />7/26/2019 4 <br />�. <br />0 7/1/2011 <br />Hail <br />(inc hes) <br />(inches) <br />1.25 <br />Hail <br />Date Size <br />(inches) <br />0 9/4/2005 2 <br />Injuries <br />0 <br />7/26/2019 <br />2.5 <br />0 <br />5/10/2011. <br />1.75 <br />0 <br />6/13/2005 <br />1.75 <br />0 <br />7/26/2019 <br />2 <br />0 <br />5/10/203.1. <br />1.75 <br />0 <br />6/8/2004 <br />1.75 <br />0 <br />7/26/2019 <br />1.75 <br />0 <br />6/25/2010 <br />2 <br />0 <br />6/26/1998 <br />1.5 <br />0 <br />7/26/2019 <br />1.25 <br />0 <br />6/17/2010 <br />2.5 <br />0 <br />10/5/1993 <br />1.25 <br />0 <br />7/26/2019 <br />1.25 <br />0 <br />6/17/2010 <br />1.25 <br />0 <br />8/27/1990 <br />4 <br />0 <br />7/15/2019 <br />1.25 <br />0 <br />7/21/2009 <br />1.25 <br />0 <br />7/24/1g81 <br />1.75 <br />0 <br />7/15/2019 <br />1.25 <br />0 <br />5/31/2oo8 <br />1.75 <br />0 <br />7/24/1g81 <br />1.75 <br />0 <br />8/31/2018 <br />1.25 <br />0 <br />5/31/2oo8 <br />1.5 <br />0 <br />7/11/i98o <br />2.75 <br />0 <br />9/6/2o16 <br />1.5 <br />0 <br />5/25/2oo8 <br />1.75 <br />0 <br />6/4/1977 <br />1-75 <br />0 <br />6/9/2015 <br />1-75 <br />0 <br />5/25/2oo8 <br />1.75 <br />0 <br />6/4/1977 <br />1.25 <br />0 <br />9/19/2013 <br />1.5 <br />0 <br />7/8/2007 <br />1.25 <br />0 <br />6/12/1976 <br />1.5 <br />0 <br />9/19/2013 <br />1.25 <br />o <br />9/21/2005 <br />1.75 <br />0 <br />7/1/2011 <br />2.75 <br />0 <br />9/21/2005 <br />1.25 <br />o <br />Source: National Centers for Environmental Information <br />Hail and Climate Change <br />According to the Federal Advisory Committee Draft National Climate Assessment (NCA), trends in <br />severe storms, including the numbers of hurricanes and the intensity and frequency of tornadoes, hail, <br />and damaging thunderstorm winds are uncertain. Since the impact of more frequent or intense storms <br />can be larger than the impact of average temperature, climate scientists are actively researching the <br />connections between climate change and severe storms (National Climate Assessment Development <br />Advisory Committee, 2013). <br />The occurrence of very heavy precipitation has increased in Minnesota in recent decades and future <br />projections also indicate this will continue (International Climate Adaptation Team, 2013). While it is <br />unknown if this precipitation will occur during severe storms that produce hail, the possibility has not <br />been ruled out. <br />Page151 <br />