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Eugene -Springfield Area Natural Hazards Mitigation Plan <br />2. Hazard Descriptions <br />Beaufort <br />1-min Wind <br />Effects on land <br />speed <br />0 <br />Calm <br />0 - 1 mph <br />Calm. Smoke rises vertically. <br />Smoke drift indicates wind direction and wind vanes cease moving. <br />1 <br />Light air <br />1 - 3 mph <br />2 <br />Light breeze <br />3 - 7 mph <br />Wind felt on exposed skin. Leaves rustle and wind vanes begin to move. <br />3 breeze <br />Gentle <br />7 - 12 no <br />Lensw Leaves and small twigs constantly awing, light flags extended. <br />4 <br />Moderate breeze <br />12 - 17 mph <br />er <br />Dust and loose papraised. Small branches begin to move. <br />5 <br />Fresh Meese <br />17 - 24 mph <br />Branches of a moderate size awe. Small trees in leaf begin to sway. <br />6 <br />24 - 30 h <br />mph <br />large branches in motion. Whistling heard in overhead wires. Umbrella use becomes difficult. <br />Strong breeze <br />Empty plastic him tip over. <br />7 <br />Near gale <br />30 - 38 nph <br />Whole trees in motion. Effort needed to walk against the wind. <br />Some twigs broken from trees. Cars veer on road. Progress on foot is seriously impeded. <br />Some branches break off trees, and some small trees blow over. Construction/temporary signs and <br />8 <br />Gale <br />38 - 46 mph <br />9 <br />46 54 mph <br />Severe gate <br />barricades blow over. <br />10 <br />54 63 mph Trees are broken off or uprooted, saplings bent and defamed. Poorly attached asphalt shingles <br />Storm <br />and shingles in poor condition peel off roofs. <br />63 73 m ish Widespread damage to vegetation. Many roofing surfaces are damaged; asphalt tiles that have <br />11 <br />Violent storm <br />curled up and/or fractured due to age may break away completely. <br />73 99 � Very widespread danage to vegetation. Sono windows may break; mobile homes and poorly <br />12 <br />Hurricane <br />cors[ru:bed sheds and bams are damaged. Debris may be hurled about. <br />Figure 2-11 Source: Ben Lee -Rodgers, 2017- Beaufort Scale <br />http://"w3weather.co.uk-IBeaufortScale.phy <br />2.10.6 Vulnerability and Capacity Assessment <br />Property damage concerns are significant with windstorms. These incidents could <br />affect almost every Eugene -Springfield resident which classifies the Cities' <br />vulnerability to this hazard as moderate. The area's capacity to respond to, and <br />recover from, a windstorm is also moderate. This is largely due to the frequency in <br />which these storms occur as well as the resources available to respond to them. <br />2.10.7 Risk Assessment <br />Based on the probability of future windstorms, the area's vulnerability, and capacity <br />to deal with them, the Eugene -Springfield NHMP Steering Committee determined <br />the overall risk from this hazard is high. <br />For a summary of windstorm impact risks see table 2-15. <br />2-68 January 2020 <br />