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Ramsey County Multi-Hazard Mitigation Plan, 2018 <br /> <br />Page | 57 <br /> <br />Vulnerability <br />Summer storms affect Ramsey County each year, so there is a 100% probability that the county and its <br />jurisdictions will be affected. According to the 67-full year NCEI record, there is a 54% chance of a <br />significant hailstorm any year in Ramsey County and a 40% chance in each year that there will be a <br />hailstorm that produces hail greater than 1 inch in size. <br />The magnitude of summer storms each year is unpredictable within Ramsey County the vulnerability of <br />jurisdictions to summer storms does not vary geographically. The vulnerability of each jurisdiction to <br />severe summer storms has not changed due to any development in the last 5 years. <br />Severe Summer Storms and Electrical Outages <br />According to NOAA data, the natural hazards that caused the greatest overall property loss in <br />Minnesota between 1996 and 2014 were thunderstorms and lightning, at $86.3 million per year. The <br />state also experienced 23 electric transmission outages from 1992 to 2009, 5 of which were due to heat <br />waves and thunderstorms. On average, the number of people affected annually by all electric outages <br />during 2008 to 2013 in Minnesota was 449,995, with a high of 1,460,810 in 2011 (U.S. Department of <br />Energy, 2015). Figure 10 below shows the seasonality of electric outages by month for the years 2008- <br />2013, and Figure 11 shows the causes of outages in the state between 2008 and 2013, with the largest <br />cause being weather/falling trees. <br />Figure 10. Electric Utility Reported Power Outages by Month in Minnesota (2008-2013) <br /> <br />Source: U.S. Department of Energy, 2015