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2024 Hennepin County All -Jurisdiction Hazard Mitigation Plan <br />Volume 2 — Hazard Inventory <br />Table 4.3.4113. Damage onset thresholds for various roofing materials. From Marshall et al. (2002). <br />Ty le o 1 Rwoofing, <br />Hailstone Size <br />rod gt,.. <br />� <br />..., <br />�fl�� <br />3-tab asphalt shingles <br />l OO <br />215 <br />30 r'. Lanii_iiated shingles <br />1.25 <br />32, <br />Cedar, shhrigles <br />L25 <br />32 <br />edjur i cediir shakes <br />1.50 <br />38 <br />Fibeu- enienit tiles <br />-50 <br />38 <br />ojxrete tiles <br />1.75 <br />44 <br />u It-t p gr°ayel roofing <br />. <br />Large hailstorms also tend to halt traffic and may require snow removal equipment to clear area roads. An <br />early morning hail event in November of 1999 caused traffic jams and spinouts in Eden Prairie, and <br />snowplows were needed to clear over 2 inches of accumulated hailstones from 1-494. ` <br />Although the human toll from hail tends to be much lower than from tornadoes and straight-line winds, <br />hailstorms are often costlier, because of the costs associated with cosmetic damages to residences, <br />vehicles, and businesses. Severe crop damage is also common, with soybeans and corn especially <br />susceptible to damages from wind-blown hail. Hail rarely causes infrastructural damage. <br />4.3.4.4. Potential for cascading effects <br />The consequences of hail are generally limited to the duration of the hail event, providing few options for <br />cascading effects. However, large, and damaging hail events tend to be associated with strong or severe <br />thunderstorms that produce or can produce other convective weather hazards, which can exacerbate or <br />compound the impacts. The large hail core in a tornado -producing supercell thunderstorm is often very <br />near the tornado itself. Thus, hail damage victims are at risk of becoming tornado victims as well. High <br />situational awareness is therefore required during large hail. Any person caught outside during a hailstorm <br />is also at significant risk from excessive rainfall and lightning. Any building or vehicle with shattered <br />windows is also more susceptible to flying debris through those now open windows as well. <br />97 <br />