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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />GRAPHIC 4.3.1011) <br />MY r <br />!hvUw 1(, <br />4 �1is 1930 1 ?.I;1 1970 I s"P'i �"'0Nf;" <br />Winter(111F), °Yer-rw' BpgrnPvri <br />�:Ilck sl L:m <br />H." cwaid'- t <br />LOWS <br />10 Y1. '.wj <br />c <br />I 8' a g <br />a I rJ P '' t L 4,`ws <br />While temperatures during our winter months seem to be warming, and as mentioned high temperatures <br />at or below zero have become much less common in recent years, this does not mean we will not be <br />seeing any extreme cold events in the future. <br />4.3.10.9. Indications and Forecasting <br />The National Weather Service is responsible for forecasting all extreme cold events for Hennepin County. <br />Typically, extreme cold events occur when a continental polar or continental arctic air mass makes its way <br />down over Minnesota. These are air masses that originate over the ice and snow-covered regions of <br />northern Canada and Alaska where long, clear nights allow for strong cooling of the surface. Extreme cold <br />typically occurs with or following a low pressure. As the system passes off to the east, continental polar <br />or continental arctic air gets pulled down on the backside of the low pressure. <br />4.3.10.10. Detection & Warning <br />The National Weather Service issues Wind Chill Advisories, Watches, or Warnings based on the following <br />forecasted criteria: <br />• Wind Chill Advisory: Widespread wind chill values around -25°F to -34°F are expected. <br />• Wind Chill Watch: Widespread wind chill values around -35°F or colder are possible. <br />• Wind Chill Warning: Widespread wind chill values around -35°F or colder are expected. <br />• Extreme Cold Watch: The possibility of wind chill or air temperatures colder than -35 'F. <br />• Extreme Cold Warning: Wind chills or air temperatures colder than -35 °F are expected. <br />165 <br />