Over the past 40 years, flood forecasting and warning in Canada has evolved into a network of forecast systems across the country. The Province of Manitoba issued overland flooding advisories. The Canadian Lightning Danger Map shows the movement of lightning strikes in real time. Many fronts cause weather events such as rain, thunderstorms, gusty winds, and tornadoes. When a tornado threatens, take shelter immediately, preferably in the lower level of a sturdy building. Ask: Did you hear about any of these natural disasters in the news? An approaching shelf cloud, a sign that strong wind is imminent. For information on user permissions, please read our Terms of Service. You will not receive a reply. Explain that while many factors contribute to any weather event, scientists agree that climate change in general is and will continue to lead to more extreme weather eventsfrom droughts to flooding to hurricanes. A weather front is a transition zone between two different air masses at the Earth's surface. Within about 30 minutes or so, a towering thundercloud (cumulonimbus) builds up, reaching heights of up to 10km. During the summer months, remember that animals also feel the heat. Swirls of dust on the ground or approaching waves on water, or shelf clouds beneath thunderstorms are often associated with strong gusty winds. Ask students to work with a partner to answer a few questions about the graph to ensure they are reading it correctly. Terms of Service| Step 4: Model note-taking as students view the first segment of the video. Its data can also be correlated with other climate variables such as SSTs, for which scientists maintain long data records. Lightning and subvisible discharges produce molecules that clean the atmosphere Bolts create reactive chemicals that affect greenhouse gases May 12, 2021 Lightning bolts break apart nitrogen and oxygen molecules in the atmosphere and create reactive chemicals that affect greenhouse gases. When the amount of air pollution is very high, the number measures as 10+. The Environment Canada wind criteria for a Severe Thunderstorm Warning is: Wind gusts 90 km/h or greater. How Seasonal Temperature Changes Affect the Construction Industry