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Ramsey County Multi-Hazard Mitigation Plan, 2018 <br /> <br />Page | 35 <br /> <br />FEMA’s Hazus tool in ArcGIS was used to estimate the damages incurred for a 100-year flood and for <br />general asset assessment. Hazus also generates aggregated loss estimates for the entire county due to a <br />100-year flood. Aggregate inventory loss estimates, which include building stock analysis, are based upon <br />the assumption that building stock is evenly distributed across each census block. Therefore, it is <br />possible that overestimates of damage will occur in some areas while underestimates will occur in other <br />areas. Total losses tend to be more reliable over larger geographic areas (groups of many blocks) than <br />for individual census blocks. It is important to note that Hazus is not intended to be a substitute for <br />detailed engineering studies. <br />4.1.6 National Centers for Environmental Information (NCEI) Records <br />Historical storm event data was compiled from the National Centers for Environmental Information <br />(NCEI). NCEI records are estimates of damage reported to the National Weather Service (NWS) from <br />various local, state and federal sources. However, these estimates are often preliminary in nature and <br />may not match the final assessment of economic and property losses related to given weather events. <br />The NCEI data included 446 reported events in Ramsey County between 1950 and April 2018. <br />However, some weather event categories only had available data going back as recent as 1996. No <br />records before 1950 were available. A summary table of events related to each hazard type is included <br />in the hazard profile sections that follow. A full table listing all events, including additional details, is <br />included in Appendix C. NCEI hazard categories used in this plan are listed in Table 11. <br />Table 11. National Centers for Environmental Information Historical Hazards <br />Hazard <br />Tornado Hail <br />Thunderstorm Wind Flood/Flash Flood <br />Winter Weather/ <br />Winter Storm/Blizzard Cold/Wind Chill <br />Excessive Heat/Heat Lightning <br /> <br />