Instability occurs when a parcel of air is warmer than the environmental air and rises on its own due to positive buoyancy. (Answer: These lines represent specific years.) The tendency is to hunch over and look down when facing strong wind. It is important to stay safe during such extreme temperatures. Lightning May Increase with Global Warming - Scientific American From Sills, D. (Environment Canada) et. While the levels of intensity, ranging from EF0 to EF5, have the same relationship to damage as the original F-scale, the associated wind speeds have been made more accurate. Instead, it spreads out, producing the anvil shape thats typical of storm clouds. Managing Editor: Privacy Notice| The amount of UV that you receive depends on both the strength of the sun's rays (measured by the UV index) and the amount of time you spend in the sun. Use "broad spectrum" sunscreen with both UVA and UVB protection, with a sun protection factor (SPF) of 15 or higher. Weather Fronts | Center for Science Education Two-thirds of Canadas major documented hailstorms have occurred in Alberta*. The bizarre phenomenon, also known as globe lightning, usually appears during thunderstorms as a floating sphere that can range in color from blue to orange to yellow, disappearing within a few . To determine the number of extreme storms, Aumanns team plotted the number of deep convective clouds each day against measurements of sea surface temperature. Avoid using a telephone connected to a landline. There are four different types of weather fronts: cold fronts, warm fronts, stationary fronts, and occluded fronts. For enquiries,contact us. Extreme Cold All tornadoes, regardless of appearance, are potentially lethal threats. After a cold front moves through your area, you may notice that the temperature is cooler, the rain has stopped, and the cumulus clouds are replaced by stratus and stratocumulus clouds or clear skies. Watch for signs of wind in the sky. On July 15, 2008, a severe thunderstorm brought straight-line winds to areas between Taber and Medicine Hat in Alberta. Scientists Across U.S. At a warm front, there may be low stratus clouds. They are on the side of the line where the front is moving. The semicircles indicate the direction that the front is moving.
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