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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Maximum sporadic wind damage footprint: 1000 mi long x 450 mi wide, November 10, 1998, <br />and October 26-27, 2010 <br />Maximum extreme wind damage footprint (MN): 400 mi long x 200 mi wide, October 10, 1949 <br />Summary of typical versus extreme non -convective wind events <br />Event <br />Frequency <br />Maximum <br />Maximum <br />Damaging <br />Extreme <br />Footprint <br />Type <br />per decade <br />sustained <br />wind <br />wind <br />wind <br />winds <br />gusts <br />duration <br />duration <br />(mph) <br />(mph) <br />(hr) <br />(hr) <br />High <br />10-30 <br />30-45 <br />55-70 <br />4-8 <br />NA <br />Isolated minor <br />Wind <br />structural damage <br />covering an area the <br />size of MN. <br />Injuries/deaths in 5- <br />10% of events <br />Extreme <br />1-2 <br />45+ <br />75-100 <br />6-24 <br />3-6 <br />Isolated minor <br />Wind <br />structural damage <br />covering several <br />states. Significant <br />infrastructural and <br />property damage <br />covering dozens of <br />counties. Numerous <br />injuries/deaths per <br />event common. <br />4.3.12.3. Spectrum of Consequences B211b <br />Non -convective winds killed nine Minnesotans between 1980 and 2005, with several other deaths <br />possible between 2006 and 2014. Estimates suggest 20-40 additional deaths occurred between 1940 and <br />1979. Thus, with at least 30 deaths (and possibly as many as 55) since 1940, non -convective extreme winds <br />clearly present a life safety risk on par with those of tornadoes and convective storm hazards. <br />Research has shown that non -convective wind fatalities are like derecho fatalities, in that the majority of <br />them occur outdoors, in boats, or in vehicles. Only 5% of documented US non -convective wind deaths <br />between 1980 and 2005 occurred within structures. By contrast, over 70% of tornado -related deaths <br />occur within buildings or homes, illustrating that people are less likely to seek shelter during non - <br />convective high winds than during tornadoes. <br />186 <br />