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<br />Section 4 <br />4-10 Ramsey County Multijurisdictional Hazard Mitigation Plan | July 2012 <br /> Environment Risk/Vulnerability: Risks to the environment are minimal for a severe summer <br />thunderstorm. Severe thunderstorms can cause flooding, which in turn can affect and create <br />contamination of potable water for public consumption. <br />Estimate of Potential Losses <br />Using a straight-line method for estimating losses, it can be assumed that structures or facilities with the <br />greatest replacement value will be those that sustain the most monetary damage. Facilities with vulnerable <br />populations include 4 nursing homes as well as over 56 public and private schools located throughout <br />Ramsey County. Ramsey County was able to determine potential monetary losses for all critical facilities <br />in the County. Structure loss combined with content loss and functional downtime is evaluated at <br />intervals of 25 percent, 50 percent, 75 percent, and 100 percent. <br />Vulnerability <br />Severe Thunderstorms <br />Frequency of Occurrence Likely <br />Warning Time Minimal <br />Geographic Extent Community-wide <br />Potential Impact Moderate to Major <br />Land Use and Development Trends <br />Ramsey County currently has no land use or development trends related to severe summer thunderstorm <br />winds. <br />Multijurisdictional Concerns <br />All of Ramsey County can potentially be affected by severe thunderstorm and high winds. As a result, <br />any mitigation steps taken related to severe thunderstorm winds should be undertaken on a countywide <br />basis. <br />Hazard Summary <br />Overall, severe summer thunderstorm winds pose one of the greatest threats to Ramsey County in terms <br />of property damage as well as injuries and loss of life. Severe summer thunderstorm winds are the most <br />frequently occurring natural hazard in the County and have the greatest chance of affecting the County <br />each year. Based on the frequency of this hazard as well as its ability to negatively impact the County, the <br />pre-disaster mitigation measures identified in this plan should be aggressively pursued. <br />Table 4-2 <br />Thunderstorm Winds10,11 <br />Location Date Type Mag Dth 12 Inj13 PrD 14 <br />1 RAMSEY 6/8/1963 Tstm Wind 0 kts. 0 0 0 <br /> <br /> <br />10 Source: National Climatic Data Center: http://www.ncdc.noaa.gov/oa/ncdc.html <br />11 For an explanation of the NCDC reports, see appendix A <br />12 Dth = Deaths <br />13 Inj = Injuries <br />14 PrD = Property damage