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<br />RISK AND VULNERABILITY ASSESSMENT <br />Ramsey County Multijurisdictional Hazard Mitigation Plan | July 2012 4-15 <br />Location Date Type Mag Dth 12 Inj13 PrD 14 <br />108 St Paul 9/21/2010 Thunderstorm <br />Wind 52 kts. 0 0 0K <br />109 White Bear Lake 7/1/2011 Thunderstorm <br />Wind 50 kts. 0 0 0K <br />110 Falcon Hgts 8/1/2011 Thunderstorm <br />Wind 52 kts. 0 0 0K <br />4.3.1.3 Tornadoes <br />Hazard Identification <br />Historical data from both SHELDUS and the NCDC was reviewed in researching the past events and <br />effects of tornadoes in Ramsey County. A tornado is a violently rotating column of air extending from a <br />thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind <br />speeds of 250 mph or more. Damage paths can be in excess of 1 mile wide and 50 miles long. Tornado <br />season in Minnesota runs ordinarily from March through August; however, tornadoes can strike at any <br />time of the year if the essential conditions are present.1 <br /> <br />Figure 4-1 <br />Tornado Risk Areas in the Conterminous United States <br /> <br /> <br />1 Source: National Weather Service, http://www.nws.noaa.gov