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2025 Hazard Mitigation Plan <br />Kittitas County, Washington <br /> <br /> <br />Chapter 4: Hazard Identification and Risk Assessment 164 <br />The cold wave annualized frequency value represents the average number of recorded cold wave hazard <br />occurrences in event days, per year over the period of record (16.9 years). Table 4-108 outlines the <br />annualized frequency for cold waves, based on FEMA NRI data, for Kittitas County. <br />Table 4-108. Cold Wave Annualized Frequency (FEMA National Risk Index) <br />Location Events on Record <br />(2005 – 2021) Annualized Frequency <br />Kittitas County 2 0.1 events per year <br />Annualized frequency is defined as the expected frequency or probability of a hazard occurrence per year. <br />4.6.7.5. Past Events <br />NCEI has reported six (6) heavy rainfall events, four (4) hail events of one (1) inch or greater, 12 strong <br />wind/damaging wind events, zero (0) tornado events, 10 heat wave/excessive heat events, and 11 cold <br />wave/extreme cold events between 1950 and 2023. There have not been any notable severe weather <br />events in Kittitas County. <br /> <br />Table 4-109 lists the heavy rain events that have been recorded in Kittitas County between 1950 and <br />2023. <br />Table 4-109. Heavy Rainfall Events (1950 – 2023) <br />Location <br />County / <br />Zone State Date Time Type Death Injury <br />Property <br />Damage <br />Crop <br />Damage <br />ELLENSBURG Kittitas County WA 7/17/2012 18:10 Heavy Rain 0 0 0.00K 0.00K <br />ELLENSBURG Kittitas County WA 6/13/2009 14:40 Heavy Rain 0 0 0.00K 0.00K <br />CLE ELUM Kittitas County WA 6/13/2009 14:25 Heavy Rain 0 0 0.00K 0.00K <br />EASTON Kittitas County WA 11/6/2006 08:00 Heavy Rain 0 0 0.00K 0.00K <br />W KING/X SE <br />KITSAP (ZONE) <br />W King/X SE <br />Kitsap (Zone) WA 2/28/2001 11:00 Heavy Rain 0 0 200.0K 0.00K <br />CLE ELUM ARPT Kittitas County WA 6/6/1998 17:05 Heavy Rain 0 0 0.00K 0.00K <br />TOTAL 0 0 200.00K 0.00K <br /> <br />Table 4-110 lists the hail events (hail one (1) inch or greater) that have been recorded in Kittitas County <br />between 1950 and 2023. <br />Table 4-110. Hail Events (1950 – 2023) <br />Location <br />County / <br />Zone State Date Time Type Death Injury <br />Property <br />Damage <br />Crop <br />Damage <br />EASTON Kittitas County WA 8/10/2013 16:21 Hail 0 0 0.00K 0.00K <br />KITTITAS Kittitas County WA 6/29/2013 12:45 Hail 0 0 0.00K 0.00K <br />CLE ELUM Kittitas County WA 7/5/2006 14:50 Hail 0 0 0.00K 0.00K <br />ROSLYN Kittitas County WA 7/5/2006 14:40 Hail 0 0 0.00K 0.00K <br />TOTAL 0 0 0.00K 0.00K <br />