Resolution 7478 hazard mitigation

Home Browse Search

2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan Volume 2 — Hazard Inventory on March 31, 2014, a confirmed tornado struck near St. Leo in Lyon County MN, while a Blizzard Warning was already in effect. 4.3.11.5. Geographic Scope of Hazard Blc A given winter storm may affect several hundred thousand square miles over a period of days, and often will have an instantaneous footprint of 50,000 square miles, under which dangerous winter weather conditions are occurring. The swath of all precipitation including rain and thunderstorms may cover an area the size of several Midwest states. Winter storms have occurred in virtually every part of the US, except for coastal southern California, parts of the Sonoran Desert, and southern Florida. The most severe winter storms are found in the Central and Northern Plains, and downwind of the Great lakes, and along the East Coast. Comparatively, Minnesota experiences storms that generally produce lesser snowfall totals and/or weaker winds. 4.3.11.6. Chronologic patterns (seasons, cycles, rhythm) Extent of precipitation associated with major winter storm on December 11, 2010 Winter storm season in Minnesota extends from late October through April, with peak frequencies from late -November through mid -March. Historically, February has had the fewest major snowstorms. However, since 2004, February has become remarkably more active, while March has become less so. 4.3.11.7. Historical data/previous occurrence Bld The Twin Cities has had dozens of major winter storms since the late 191h century, with 25 calendar -day snowfalls of 10 inches or greater, and 26 two-day totals of at least 12 inches (TABLE 4.3.11A). TABLE 4.3.11A Historical 2-day snowfall totals of 12" or greater in the Twin Cities. Events in bold are known blizzards in Hennepin County since 1940. 173