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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />the updraft is overcome by the downdraft and the dissipating stage begins. <br />Lightning can remain a danger throughout all three stages of a storm.31 (Figure 2-5) <br />T� � <br />(a) Cumubs (b) Mews <br />s�mrrnmwnw..eaxari <br />Figure 2-5 Three different stages of thunderstorm development <br />http.//glob alsailingweather. com/thunderstorms. php <br />Hail <br />(c) Dissipating <br />Source: Global Sailing Weather - <br />Hail occurs when updrafts in a thunderstorm carry raindrops into extremely cold <br />areas of air where they freeze into balls of ice. This cycle is repeated, and the ball of <br />ice grows, until the storm's updraft is no longer able to support the weight of the <br />ice. The hail then falls to the ground when the size of hail is too large for the storm <br />to support or the updraft weakens. <br />Large hail can cause significant damage. Usually, hail is pea to marble size, but <br />large storms can produce larger hail. The largest hail ever recorded in the United <br />States was in Vivian, SD. It had a diameter of 8 inches, a circumference of 18.62 <br />inches, and weighed 1 lb. 15 oz.32 Hail with an inch diameter is considered severe, <br />but there are only anecdotal accounts of such weather phenomenon occurring in the <br />Eugene -Springfield area. <br />" United States. NOAA The National Severe Storms Laboratory. Thunderstorm Basics. Accessed <br />November 2017. http://www.nssl.noaa.gov/education/svrwx101/thunderstorms/. <br />12 United States. NOAA The National Severe Storms Laboratory. Hail Basics. Accessed November <br />2017. http://www.nssl.noaa.gov/education/svrwxl0l/haiV. <br />2-21 January 2020 <br />