Resolution 7478 hazard mitigation

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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan Volume 2 — Hazard Inventory 4.3.1.4. Potential for cascading effects Climate change enhances some hazards, so please see chapters on Extreme Heat, Straight-line winds, Extreme rainfall, and non -convective winds, to understand the potential cascades that climate change may enhance or cause. The most novel group of cascading effects to consider with climate change is when warm conditions produce a meteorological situation previously unheard of or quite rare. Winter severe thunderstorm events, for example, may be more likely as winters continue warming, but to occur, they would almost certainly be accompanied by a powerful low-pressure system capable of producing plunging temperatures and strong winds. Communities facing power outages, debris clean-up, and even search -and -rescue operations may then have to face with cold weather hazards. 4.3.1.5. Geographic scope of hazard Blc Climate change is a global hazard and influences weather and climate patterns in some way virtually everywhere. In Minnesota, the greatest warming has been in the northern part of the state, and the largest precipitation increases have been in the southeastern and central portions of the state. However, the entire state of Minnesota, including all of Hennepin County is at risk from increased precipitation extremes, more intense humid heat waves, and the seasonal expansion of severe thunderstorms and heat. 4.3.1.6. Chronological patters (seasons, cycles, rhythm) Warming is occurring year-round, though the most pronounced changes have been during winter. It should be noted that the area's climate exhibits natural high variability, and that variability will continue, even as Minnesota warms. It should also be noted that hazard risk does not necessarily follow the cycle of greatest warming. For instance, damaging rains are far more likely in the summer than the winter. 4.3.1.7. Historical Data/Previous Occurrence Bld The year 2012 may be thought of as a preview of the years and decades ahead. The 2011-12 winter was warm and short, with bouts of 50s and 60s observed throughout Minnesota during January. March that year saw 8 record high temperatures in Minneapolis, and 8 days above 70 degrees. Throughout the region, March 2012 obliterated long-standing daily and monthly temperature records. The warmth continued through the remainder of the spring and into the summer, with over 30 days above 90 degrees in parts of Hennepin County, and 2 days above 100 at MSP. This was the first summer with multiple 100-degree readings since the summer of 1988. Others may consider the late 2010s to be representative of the future, because: Based on the Midwest chapter from the 2014, 2018, and 2023 National Climate Assessment, a review of other recent research into the region, and analyses of quality -controlled, nationally standardized, and publicly available data, the recent trends can be described as follows. 57