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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Snowfall totals from December 10-12, 2010, storm. Courtesy of NWS <br />Chanhassen <br />Very heavy snow accompanied this system, with widespread totals between 12 and 24 inches. <br />The Twin Cities recorded 17.1 inches, making it the fifth largest snowstorm on record, and the <br />largest in December. For the third time in 30 years, the excessive snow load ripped and then <br />collapsed the Teflon roof of the Metrodome. <br />There have been no other incidents that are within the scope of this plan. <br />4.3.11.8. Future trends/likelihood of occurrence Ble <br />Research on the future of winter storms in Minnesota is lacking, but recent trends indicate a tendency <br />towards increases in the size of the largest snowfall events. However, this increase is not yet statistically <br />significant. <br />Climate change on one hand is causing a rapid warming of winter, and on another hand is putting more <br />water vapor into the atmosphere. Therefore, it is plausible that snowstorm intensity could increase, even <br />as seasonal snowfall decreases. However, using data from the Twin cities and Minnesota in general, there <br />is no evidence that seasonal snowfall is decreasing, even though significant winter warming is well <br />underway. It is possible that the current trend of an increase in high -end snowfall events will continue. <br />Using the Twin Cities snowfall record from 1900-2015, a daily snowfall ofjust of six inches can be expected <br />annually. The 10-year snowfall amount for a calendar day is just over 12 inches. These values can be <br />analyzed for durations of up to 7 days and return periods of up to 100 years. <br />178 <br />