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<br /> <br />2021 Multijurisdictional Local Hazard Mitigation Plan <br /> <br />severe if all six days of high heat occurred consecutively, resulting in a heat wave. On average countywide, the <br />average number of high-heat days is expected to increase from one per year in 1995 to three per year in 2070. <br />Figure 14-5 shows the distribution of high heat days projected for 2030 and for 2070 in San Mateo County due to <br />climate change. <br /> <br /> <br /> Figure 14-5. Extreme Heat Projections for San Mateo County <br /> <br /> <br />14.2.4 Severity <br />The most common problems associated with severe storms are immobility and loss of utilities. Fatalities are <br />uncommon but can occur, especially in extreme heat events. Roads may become impassable due to flooding, <br />downed trees, or a landslide. Power lines may be downed due to high winds, and services such as water or phone <br /> <br /> <br />14-14