Resolution 7478 hazard mitigation

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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan Volume 2 — Hazard Inventory Graphic 4.3.7A TOIU A Urban, Heat Island Sept. 75 4am, COT % '. Low ' 30 4 F 4.3.7.6. Chronologic Patterns While the definition of extreme heat indicates an extended period where temperatures are above average high temperature, you typically see extreme heat as an issue during the summer months of May through September in Hennepin County. 4.3.7.7. Historical Occurrence Bld There have been several past instances of extreme heat in Hennepin County. The earliest records of extreme heat include the Dust Bowl of the 1930's. The Dust Bowl years of 1930-36 brought some of the hottest summers on record to the United States, especially across the Plains, Upper Midwest, and Great Lake States. For the Upper Mississippi River Valley, the first few weeks of July 1936 provided the hottest temperatures of that period, including many record highs. Two consecutive heat waves occurred in 1999. The first was on July 23-25, 1999, when a massive upper ridge over the central U.S. enabled heat to build into Minnesota. Heat indices ranged from 95-110 on the 23rd, 90-105 on the 241h, and climaxed at 95-116 on the 251h. One death resulted from the heat wave after a man fell asleep inside a closed vehicle on the 251h. The second heat wave of 1999 occur less than a week later for central and south-central Minnesota. This heat wave lasted from July 291h, 1999, through July 301h, 1999. This heat wave was stronger with heat indices climbing to the 95-114 range with lows in the 70s and dew points in the middle 60s to 70s which produced heat indices 70-85 even in the morning hours. In 2001, there were another two heat waves, one that was from July 30 through August I", and a second from August 41h through August 81h. The July 30th-August V heat wave is commonly known for the heat wave where Minnesota Vikings football player Corey Stringer collapsed on the football field around 133