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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br />Table 4-'163. Winter Weather Risk Index (FEMA National Risk Index) <br />The ice storm Risk lndex score and rating represent a community's relative risk for ice storm when <br />compared to the rest of the United States. Table 4-164 illustrates the ice storm Risk lndex rating and <br />score for Kittitas County. <br />Table 4-164. lce Storm Risk Index (FEMA National Risk Index) <br />Table 4-165 represents the Winter Weather Total Risk Score for the Kittitas County, based on the Risk <br />Assessment Methodology, as defined in Section 4.3 of this Plan. <br />Table 4-165. Winter Weather Total Risk Score <br />35.7Kittitas County Relatively Low <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Resilience (Expected Annual Loss x Social Vulnerability / Communi$ Resilience = Risk lndex). <br />Jurisdiction Rating Score <br />2.0Kittitas County Very Low <br />Risk lndex scores are calculated using an equation that combines scores for Expected Annual Loss due to natural hazards, Social <br />Vulnerability and Community Resilience (Expected Annuai Loss x Social Vulnerability / Community Resilience = Risk lndex). <br />Jurisdiction Rating Score <br />Hazard <br />Event Probability <br />Factor Vulnerability lmpact <br />J 15 16 24 55Winter Weather <br />Consequence: Sum of all weighted factors. <br />Extent: Sum of the weighted Extent factors. <br />Vulnerability: Sum of the weighted Vulnerabililv factors. <br />Classification lmpactVulnerabillty <br />Impact: Sum of the weighted lmpact factors. <br />Total Risk Score = Probability x Consequence <br />* Normalized to 100 <br />Low (L)1 0-6 0-6 0-12 0 -24 0 -24 <br />7-12 7-12 13-26 25-50 25-52Medium (M)2 <br />13-18 27 -39 51 -75 53 and above13-18 <br />The legend-specifically the assignment of low, medium, and high-provides an additional means to qualitatively assess the probability factor, sum of <br />weighted factors, and the total risk scores for each hazard. The Consequence Score represents the sum of the Extent, Vulnerability, and lmpact Factors. <br />The Total Risk Score rs a measure of Probabilitv and Consequence. <br />TotalRisk <br />;L\i,li,: <br />xil <br />..'r I ,t i <br />it i11ir1r,r fl'irj, <br />Total Risk Score Legend <br />TotalRisk <br />Score <br />Chapter 4: Hazard ldentification and Risk Assessment 210