Thunderstorms also help keep the Earth in electrical balance. tropical storm with wind speeds of at least 119 kilometers (74 miles) per hour. Lightning is an electrical discharge caused by a buildup of static electricity between thunderclouds, or between thunderclouds and the ground. On weather maps, the surface location of a warm front is represented by a solid red line with red, filled-in semicircles along it, like in the map on the right (B). Divide students into groups of two or three and distribute the Analyzing a Natural Disaster Event handout to each student. Severe Thunderstorm Warning criteria for hail is hail 20 millimetres in diameter or greater (nickel-sized or larger). July 11, 2004. The rapid heating and cooling of the gases within a lightning bolt produces nitric oxide (NO), which combines with oxygen to create nitrogen dioxide (NO2), especially when its moving downwind. Depending on thunderstorm type, a storm may go through it only once (single cell), or multiple times (multi-cell). Under the right conditions, rainfall from thunderstorms causes flash flooding, killing more people each year than hurricanes, tornadoes or lightning. Watch a video about the 2017 California wildfires. ACE calculates the intensity of a hurricane season by combining the number, wind speed and duration of each tropical cyclone. The higher the number, the greater the health risk associated with the air quality. There is only one documented F5 in Canadian history, at Elie, MB June 22, 2007. Thunderstorms are usually over within an hour, although a series of thunderstorms can last several hours. Excessive hail, when combined with heavy rain, can plug storm drains and suddenly create local flooding. A tornado is a violently rotating column of air extending between a cloud base and the surface. Seniors, parents of children with asthma, and people suffering from diabetes, heart or lung disease, can use the index to assess the risk air pollution poses to their health and take steps to lessen that risk. After heavy winds, check your property for dead branches and damage. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface. Once students have identified that trend, challenge them by asking how that could be true, since there were more events in 1989 than there were in 2014. How might particular extreme weather and natural climate phenomena, such as El Nio and La Nia, be affected by climate change, they wonder? How can my cat know that a thunderstorm is on its way an hour before I do? Fog consists of tiny water droplets suspended in the air that reduce visibility to less than one kilometre. Know potential risks for flooding in your area and plan an escape route to higher ground. One hailstone was measured with a diameter of about 9 centimetres - some of the largest hail the province has seen in years. What steps can we take to protect lives, property, and infrastructure as more extreme weather-related natural disaster events become more common?
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