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RISK AND VULNERABILITY ASSESSMENT Ramsey County Multijurisdictional Hazard Mitigation Plan | July 2012 4-21 Vulnerability Extreme Temperatures Frequency of Occurrence Likely Warning Time More than 12 hours Geographic Extent County-wide Potential Impact Negligible Multijurisdictional Concerns All of Ramsey County is subject to extreme temperatures and therefore should be included in any prospective mitigation projects. The probability of extreme temperatures occurring in the future is relatively low based on previous data. The entire county is at risk of extreme temperature events. Extreme temperatures affect Ramsey County equally and uniformly. Hazard Summary Extreme temperatures have occurred across the entire of Ramsey County area. Extreme temperature effects are seen in different regions and vary depending on normal meteorological conditions such as either extreme heat or extreme cold. Extreme temperatures are possible throughout the planning area, with the northern portion of the state being susceptible for extreme cold temperatures during the winter months of the year. 4.3.1.6 Hailstorms Hazard Identification Hail is a form of precipitation composed of spherical lumps of ice. Known as hailstones, these ice balls typically range from 5-50 mm in diameter on average, with much larger hailstones forming in severe thunderstorms. The size of hailstones is a direct function of the severity and size of the storm. During a public meeting, participants identified that during a 1999 hailstorm some residents experienced damaged and destroyed roofs. Hazard Profile Table 4-6 Hail Events 18 Location Date Type Magnitude Death Injuries 1 RAMSEY 4/23/1960 Hail 1.00 in. 0 0 2 RAMSEY 6/23/1962 Hail 1.75 in. 0 0 3 RAMSEY 7/21/1962 Hail 1.00 in. 0 0 4 RAMSEY 7/8/1966 Hail 1.75 in. 0 0 5 RAMSEY 6/20/1974 Hail 0.75 in. 0 0 18 Source: National Climatic Data Center, http://www.ncdc.noaa.gov/oa/ncdc.html