Exam 10: Atmosphere and Severe Weather
To be classified as a blizzard in Canada,a storm must have
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The 1998 ice storm was the most expensive natural disaster in Canadian history.Discuss the meterological conditions that created it,briefly outlining the direct and indirect damage done.Discuss ways and means to prevent this level of catastrophe from happening again.
meterological conditions: high over Bermuda,a low in the Mississippi Valley drove warm Gulf air north.It met a wedge of cold Arctic air driven south by a high Arctic air pressure system over Hudson's Bay.This cold wedge settled into the St Lawrence and Ottawa Valleys.The moist warm air,riven over the cold air,cooled and condensed,resulted in rain which super cooled and became freezing rain.This system was stationary for ~ a week and 10 cm of ice fell over an 80 hour period.
damage: 1000 steel power poles and 12000 km of line were damaged led to 5 million people without power,some for over three weeks.45 people were killed and 1000 injured directly from falling ice,and indirectly from hypothermia,house fires and carbon monoxide poisoning-while people tried alternative means to stay warm
Crops were lost,trees damaged (maple industry severely affected),and milk industry affected as no refrigeration was possible.
mitigation: redundancies for power grid,individual or local back up for power and essential services.Redundancies for communication,education and emergency preparedness if power goes out.
Discuss the atmospheric conditions that give rise to the most severe weather in your area.Explain why those conditions occur in your area and why they result in severe weather.
Answers will vary depending on location.
Near-freezing temperatures can be considered 'extreme cold' and has resulted in lives lost in
The ice storm of 1998 was associated with a rapidly moving warm front that produced continuous rain over a 24-hour period.
In the Northern Hemisphere,which of the following describes the likely location of an ice storm?
Blizzards on the east coast of Canada commonly occur during
________ refers to the energy absorbed or released when a substance changes phases.
What are the risks to the public of issuing tornado watches and warnings?
If you wanted to avoid thunderstorms,of the following,where would you choose to live?
When water evaporates from the ocean,then condenses in the atmosphere
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