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City of Minneapolis Office of Emergency Management CITY OF MINNEAPOLIS OFFICE OF EMERGENCY MANAGEMENT Straight Line Wind Fact Sheet AM I AT RISK? Since most thunderstorms produce some straight–line The term “straight–line” wind is used to differentiate the winds as a result of outflow generated by the thunderstorm damage they cause from tornado damage. Strong, downdraft, anyone living in thunderstorm–prone areas is at damaging winds can come from a number of different risk. Damage from severe thunderstorm winds account for thunderstorm processes. Most thunderstorm winds that half of all severe reports in the lower 48 states and is more cause damage at the ground are a result of outflow common than damage from tornadoes. Wind speeds can generated by a thunderstorm downdraft. Damaging winds reach up to 100 mph and can produce a damage path are classified as those exceeding 50–60 mph. A severe extending for hundreds of miles. thunderstorm is capable of producing winds with speeds faster than 100 mph, even without a tornado. People living in mobile homes are especially at risk for injury and death. Even anchored mobile homes can be A storm that is capable of producing consistent straight– seriously damaged when winds gust over 80 mph. line winds of 58 mph or more and covers an area of more People who are outdoors are most at risk to straight line than 240 miles is known as a “derecho”. A derecho is a wind. Campers or hikers in forested areas are vulnerable to widespread, long–lived wind storm that is associated with being injured or killed by falling trees, and people on bodies a band of rapidly moving showers or thunderstorms. A of water risk injury or drowning from storm winds and typical derecho consists of numerous microbursts, waves that can overturn boats. Occupants of cars and downbursts, and downburst clusters. Powerful gusts can trucks also are vulnerable to falling trees and utility poles. cause heavy damage to cars and buildings. The storm’s High profile vehicles such as semi–trailer trucks, buses, and dynamic straight–line winds can also knock down trees sport utility vehicles may be blown over. At outside events and power lines, possibly injuring people nearby, similar to such as fairs and festivals, people may be killed or injured the damage caused by tornadoes. by collapsing temporary structures and flying debris. Even those indoors may be at risk for death or injury. Mobile homes, in particular, may be overturned or destroyed, DID YOU KNOW? while barns and similar buildings can collapse. People inside homes, businesses, and schools are sometimes "Derecho" is a Spanish word meaning "direct" or "straight victims of falling trees and branches that crash through ahead" and coined to distinguish straight–line wind damage walls and roofs; they also may be injured by flying glass from that produced by tornadoes. from broken windows. On occasion, severe structural Storms with severe straight–line winds often also have hail damage to buildings (for example, the removal of a roof) and tornadoes. poses danger to those within. Straightline winds are similar to tornadoes in that they may Derechos pose a special hazard to those in urban areas. It is generate a loud roaring sound at their approach. the vulnerability of overhead electric and communication If winds flowing out from a thunderstorm exceed 58 mph, lines to high winds and falling trees that makes derecho the storm is considered severe. winds especially problematic in urban areas. In addition to posing a direct hazard to anyone caught below the falling lines, derecho damage to overhead electrical facilities sometimes results in massive, long–lasting power outages FORECASTING AND ALERTING that can affect hundreds of thousands of people; in the IfForecasters winds flowing may issue out from outlooks, a thunderstorm watches or exceed warnings 58 for worst events, power may not be restored for days. The complex and dense networks of overhead distribution lines mph,high winds,the storm severe is considered weather and severe. thunderstorms. The best, most reliable way to ensure you’re alerted to severe – and their proximity to large trees – make urban and weather threats is a weather alert radio. A weather alert suburban areas especially vulnerable to significant radio is especially useful in the middle of the night or when derecho–induced electrical and communication outages. In Ifthe electricity is out. winds flowing out We suggest a weather alert radio with from a thunderstorm exceed 58 addition, unlike the localized damage produced by a mph,either an emergency crank or battery back the storm is considered severe. –up power. tornado, derecho damage may be widespread, with repairs reQuiring considerably more time and effort to accomplish. 0629 16 Straight Line Wind Fact Sheet 1 If winds flowing out from a thunderstorm exceed 58 mph, the storm is considered severe. and can produce significant damage, even to structures. CITY OF MINNEAPOLIS OFFICE OF EMERGENCY MANAGEMENT STRAIGHT LINE WIND DO’S AND DON’TS Do • Be aware that tall trees near a building can be uprooted • Have an emergency plan and preparedness kit. by straight–line winds – that trees can come crashing • Collect your wallet, keys, required medications and any through the roof of a home and crush a person to other necessities and keep them with you. death. • If you are already inside a structure, go to a pre– • Put on sturdy shoes. designated shelter area such as a safe room, basement, storm cellar or the lowest building level or interior • Stay away from power lines, broken glass, nails and other dangerous objects. room/hallway. • Wait for information and instructions from emergency • Stay away from windows and glass doorways. crews or local officials. • Listen to a NOAA Weather Radio, regular radio or television for storm updates. (Battery–powered devices are best, in case the electricity goes out.) Do Not • Underestimate the power of strong thunderstorm • Keep pets on a leash or in a crate or carrier. winds known as straight–line winds – they can reach • Crouch as low as possible to the floor, facing down. speeds of 100 to 150 mph. Cover the back of your head with your hands. • Attempt to approach or drive over a downed power • If outside immediately seek shelter, and stay away line. from trees or large objects that could topple over on • Do not use elevators because the power may fail, you. If you're outside with no shelter, lie flat in a ditch leaving you trapped. or depression and cover your head with your hands. • Do not light candles or use open flames, even after the • Watch out for flying debris. Flying debris from storm has passed. Ruptured gas lines can create a fire tornadoes causes most fatalities and injuries. hazard so it's better to use flashlights. • Stay inside until you're certain the storm has passed. WEB SITES and LINKS QUICK FACTS YOU SHOULD KNOW ABOUT STRAIGHT LINE WINDS Information on strong straight–line wind events and Derechos in the United States are most common in the late preparedness spring and summer (May through August), with more than 75% occurring between April and August. As might be Web site: expected, the seasonal variation of derechos corresponds http://www.spc.noaa.gov/misc/AbtDerechos/derechofacts rather closely with the incidence of thunderstorms. .htm While hail and straight–line winds generally do not garner National Weather Service the same attention or respect as tornadoes, they can be just http://www.nws.noaa.gov/om/severeweather/index.shtml as deadly! Hail can exceed the size of softballs and fall at http://www.nws.noaa.gov/om/brochures.shtml speeds of over 100 mph, seriously injuring or killing anyone in its path. Straight–line winds can topple trees onto cars, The Weather Channel houses, and power lines. Many deaths from straight–line https://weather.com/safety winds are the result of trees falling onto the person, whether they are outside, in their house, or driving in their American Red Cross car. Strong straight–line wind events can even destroy http://redcrosshelps.org/severeweather/ buildings, especially mobile homes and manufactured homes. Federal Emergency Management Agency Ready. gov https://www.ready.gov 062916 Straight Line Wind Fact Sheet 2 CITY OF MINNEAPOLIS OFFICE OF EMERGENCY MANAGEMENT BE PREPARED Before • Build an emergency kit and make a family emergency During plan and communications plan • Inside of a well–built home or building: Move to the • Listen to NOAA Weather Radio or to commercial radio lowest floor and stay away from windows. Taking or television newscasts for the latest information. In shelter in a basement is strongly encouraged, especially any emergency, always listen to the instructions given if you are surrounded by trees that could fall onto the by local emergency management officials. building or house. • Be alert to changing weather conditions. • In a mobile home or manufactured home. Move to a • If planning to be outdoors for a significant length of stronger building or storm cellar if one is nearby Mobile time, be aware of the weather forecast–especially if and manufactured homes can usually withstand low– you will be well–removed from sturdy shelter. end straight–line wind storms, but as winds reach or • To reduce the damage from straight–line wind secure exceed 70 mph, the risk of these homes being blown objects that can be blown by the wind. apart or struck by falling trees increases greatly. • Keep trees well pruned. Tree branches falling on cars or • Driving: houses produce a significant amount of damage in high – Keep both hands on the wheel and slow down. wind events. – Pull over to the shoulder and stop, making sure you are away from trees or other tall objects that could fall onto your vehicle.
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