Resolution_2025 Kittitas County Hazard Mitigation Plan

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2025 Hazard Mitigation Plan Kittitas County, Washington Chapter 4: Hazard Identification and Risk Assessment 163 • The probability of occurrence for strong winds/damaging winds in Kittitas County is high because significant occurrences of this hazard occur annually throughout the County. • The probability of occurrence for thunderstorms, cold wave/extreme cold, and heat wave/extreme heat is medium because significant occurrences of these hazards have occasionally impacted the County and will likely occur again within 25 years. • The probability of occurrence for hail and tornadoes is low because a significant occurrence of these hazards is likely to occur within 100 years. The hail annualized frequency value represents the average number of recorded hail hazard occurrences, in event days, per year over the period of record (34 years). Table 4-104 outlines the annualized frequency for hail, based on FEMA NRI data, for Kittitas County. Table 4-104. Hail Annualized Frequency (FEMA National Risk Index) Location Events on Record (1986 – 2021) Annualized Frequency Kittitas County 3 0.1 events per year Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. The strong wind annualized frequency value represents the average number of recorded strong wind hazard occurrences, in event days, per year over the period of record (34 years). Table 4-105 outlines the annualized frequency for strong winds, based on FEMA NRI data, for Kittitas County. Table 4-105. Strong Wind Annualized Frequency (FEMA National Risk Index) Location Events on Record (1986 – 2021) Annualized Frequency Kittitas County 3 0.1 events per year Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. The tornado annualized frequency value represents the average number of recorded tornado hazard occurrences, in event days, per year over the period of record (72 years). Table 4-106 outlines the annualized frequency for tornadoes, based on FEMA NRI data, for Kittitas County. Table 4-106. Tornado Annualized Frequency (FEMA National Risk Index) Location Events on Record (1950 – 2021) Annualized Frequency Kittitas County 0 0.1 events per year Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. The heat wave annualized frequency value represents the average number of recorded heat wave hazard occurrences in event days, per year over the period of record (16 years). Table 4-107 outlines the annualized frequency for heat waves, based on FEMA NRI data, for Kittitas County. Table 4-107. Heat Wave Annualized Frequency (FEMA National Risk Index) Location Events on Record (2005 – 2021) Annualized Frequency Kittitas County 15 0.9 events per year Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year.