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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Warning Products <br />Remarks <br />Sustained wind or frequent gusts greater than <br />A major life safety hazard is ongoing or <br />or equal to 35 mph accompanied by falling <br />imminent. Danger is greatest for those <br />and/or blowing snow, frequently reducing <br />traveling or caught outdoors. Maybe issued <br />visibility to less than 1/4 mile for three hours <br />2-4 times per year in open areas of for <br />or more <br />southern and western Minnesota. Very rare <br />in Hennepin County, one was November 1-2, <br />1991. <br />Significant and dangerous winter weather is <br />This product spans a large range, from <br />expected, generally within 24 hours. Six or <br />heavy snow events with little or no wind, to <br />more inches of snow, not to exceed 48 hours, <br />major wind -driven events that produce <br />half an inch of sleet and/or forecaster <br />near -blizzard conditions. Typically, 2-4 <br />discretion: a combination of snow, sleet, <br />issued for Hennepin County per winter. <br />freezing rain, blowing snow, and/or wind <br />leading to significant impacts. <br />The occurrence of snow squalls (short bursts <br />quick onset snow band with intense <br />of intense snow) meeting or exceeding one or <br />snowfall with potential impacts. <br />both of the following conditions: <br />• Visibility 1/4 mile or less in <br />snow with sub -freezing road <br />temperatures. Often <br />accompanied by wind gusts <br />greater than 30 mph. <br />• Plunging temperatures <br />sufficient to produce a flash <br />freeze, along with a significant <br />reduction in visibility from <br />falling and/or blowing snow. <br />Additional factors to consider: <br />• Time of day. <br />• Highways and interstates <br />impacted. <br />These are polygon -based warnings that last <br />usually an hour or less. Larger and longer <br />events are covered by Winter Storm <br />Warnings. <br />Severity tags: <br />• General (no tag): Used <br />frequently. Snow squall <br />conditions are expected or <br />observed, but mitigating <br />actions, combined with societal <br />context, will reduce the threat <br />to safe travel. <br />• "SIGNIFICANT" tag: Used only <br />when suspected or observed <br />180 <br />