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InnisfilWeather.Com
Information Supplied By Environment Canada. Tornados, Funnel Clouds, Cold-Core Funnel, Landspouts, Waterspouts A Tornado Watch is issued when severe thunderstorms have developed and there is the possibility of one or more tornadoes developing within the areas and times specified in the watch. Be prepared to take action if a warning is issued. A Tornado Warning is issued when one or more tornadoes are occurring in the area specified or detected on Doppler radar. The expected motion, development and duration will be given in the warning. Find appropriate shelter. Safety Tip: Remember that severe thunderstorms sometimes produce tornadoes with little or no warning. Treat all funnel clouds and tornadoes seriously. If you see a funnel approaching or large hail is falling you should immediately take shelter. Other “twister sisters” - cold-core funnels, funnel clouds, landspouts and waterspouts. These tornadic type events are often not associated with severe thunderstorms and are therefore difficult to forecast. They can appear with little or no warning. Funnel clouds that form out of large cumulus clouds or very weak thunderstorms normally do not have the energy to reach the ground. If they do briefly touch down they can be destructive over a small area. A Tornado Watch is issued if more funnel clouds are expected. Cold-core funnels are true funnel clouds by appearance, but will not lead to a damaging tornado. They are usually brief and thin, and often occur under the rain-free base of weak storms or large cumulus clouds during relatively cool, moist weather from spring to fall. These funnel clouds are commonly seen in the Prairies, in summer, during spells of cool, windy and unsettled weather. When cold air funnels are reported a Tornado Watch is issued. Landspouts are a weak tornado type seen under small summer storms or large, growing cumulus clouds. It is like a cold-air funnel that has touched down and can cause brief, usually minor, damage. They normally move slowly and can last for minutes. Landspouts occur in most parts of Canada. They don't always have a full condensation funnel and are sometimes only made visible by the dust they stir up. A Tornado Watch is issued if there is a reasonable probability of more landspouts developing. The waterspout is another weak tornado type. Like a landspout, it looks like a slender tornado, but occurs only over water in the same situations as cold-air funnels. They are occasionally seen near the coasts in the late summer and fall, but are more common in early fall over large lakes. A Tornado Watch or Tornado Warning will only be issued if a waterspout has the potential to move onshore. Special marine warnings are issued for waterspouts. Not all severe winds associated with thunderstorms are caused by tornadoes. Microbursts, macrobursts, downbursts, gustnadoes, squall lines, plough winds or derechoes are other labels given to damaging thunderstorm winds. Safety Tip: Remember damage, injury and death is often associated with flying projectiles and not just collapsing buildings or toppling trees. |
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