Windstorms

• A downdraft is a small column of air that rapidly sinks toward the ground. It can result in microbursts and macrobursts.
  • Microbursts are small (<4km across) but extreme downdrafts with high windspeeds at or near the surface. They are often short lived (e.g. 5-10 mins) and can be either wet with heavy precipitation or dry.
  • Macrobursts are larger (>4km) outward bursts of strong winds at or near the surface caused by extreme downdrafts. Their damage can be similar to that of a tornado.
• A derecho is a widespread, long-lived, straight-line windstorm that is associated with a land-based, fast-moving group of severe thunderstorms. It often includes multiple microbursts, downbursts, and downburst clusters amongst a band of rapidly moving thunderstorms or showers extending more than 400km.

• Wind Warning: when winds at speeds of 70 km/hr or more are sustained; and/or wind gusts to 90 km/h or more.

You can receive local weather alert information by downloading the WeatherCAN app or you can check local weather and forecasts online at www.weather.gc.ca

• Consider purchasing a weather radio or using a weather alerting service available to the public (e.g. WeatherCAN app).
• Remove dead or rotting trees and branches that could fall and cause injury or damage. Ensure items outside are stored away or tied down when high winds are in the forecast.
• Consult the building department regarding wind-resistant construction for your home or business (e.g. bracing, anchorage, wind-rated garage doors).
• Consider installing storm shutters to protect windows from airborne debris.
• Ensure loose objects outdoors are put away or secured when not in use. Securely anchor outdoor appliances (e.g. air conditioner) and utility sheds.
• Create an emergency plan and ensure you identify an interior location within a sturdy building that has no or very few windows in the basement or lowest level where you can shelter. Mobile, manufactured, trailer homes, and recreational vehicles (RVs) are not safe in high winds. If you are in one of these structures, you need to identify a sturdy building nearby that you can get to quickly.
• Plan for power outages as they are often associated with severe weather including damaging winds. Charge devices (e.g. cell phones, laptops, tablets) prior to forecasted storms and consider installing an alternate power source (e.g. generator).
• Build an emergency kit for your home and vehicle. Damaging winds can disrupt utilities and roadways (e.g. fallen trees, debris) for extended periods of time.
• Review your homeowners or renters insurance to ensure you have adequate insurance for your property and personal belongings. Know what is covered, the level of coverage, and the deductible.
• When the sky looks threatening or rapid temperature changes are forecasted, turn on your radio and monitor weather reports, or go to the WeatherCAN app or online at www.weather.gc.ca for more information.
• Immediately before the storm hits and provided it is still safe to so,
  • disconnect electrical appliances such as computers, television sets, appliances and electronics that are charging if there is the potential for lightning
  • put your vehicle in the garage
  • bring pets and livestock to shelter unless there is an immediate risk of flooding
  • close outside windows and doors including garage doors

• Seek suitable shelter immediately if a warning has been issued or if you believe sudden, high-speed winds are headed your way. Regardless of where you are when during damaging winds, you should get as close to the ground as possible and protect your head, watch out for flying debris and avoid windows. Many ideal shelter locations are similar to those for tornadoes.
  • Within a home, go to the basement or lowest level and use the most interior room with the least amount of windows or other potential openings.
  • If in an office or apartment, take shelter in an inner hallway or room in the basement or lowest level. Do not use the elevator.
  • If in a large building with widespan roofing (e.g. gymnasium, auditorium, mall, arena, barn), look for more suitable shelter elsewhere as these buildings are more prone to collapse. If you are unable to do so, take cover under a sturdy object (e.g. table).
  • Mobile, manufactured, trailer homes, and recreational vehicles (RVs) are not safe in high winds. If you are in one of these structures, you need to seek a sturdy building nearby that you can get to quickly.
  • If you are driving, try to find suitable shelter. Avoid taking shelter under bridges or overpasses.
• Avoid unnecessary travel. If you have to go out, make sure you are prepared for delays (e.g. fuel, vehicle emergency kit) and tell others of your route and anticipated arrival time.
• Pay attention to local media and alerting systems for current emergency information and instructions.

• Check with authorities and weather forecasts for information on whether it’s safe to go outside.
• Watch for fallen power lines, trees and other debris.
• If there has been heavy rainfall, avoid low-lying areas in case of flash flooding.
• Check on vulnerable family members, friends and neighbours who may require assistance.
• If your home or business appears to have significant structural damage, do not enter unless you are sure it is safe to do so. Rely on professionals to clear your home or business for re-entry if you are unsure. Take photos of the building and its contents for insurance claims.
• Check with authorities on how to dispose of damaged items from your home.
• Evaluate your emergency plan and restock your emergency kit.