Tornadoes
A tornado is a fast rotating narrow area of low pressure
that forms during strong thunderstorms.
The first part of the tornado is the vortex tube, which is rotating body
of air on the ground; this is a direct result of vertical wind shear. The air is then lifted off the ground from
the updraft of the thunderstorm, once the air mass is almost vertical it is
considered a mesocyclone; as the mesocyclone stretches the air mass starts to
rotate faster. Tornadoes usually travel
from southwest to northeast because in the northern hemisphere because they are
influenced by the prevailing wind direction, which also flows in that
direction. In the Unites States alone
there is an average of 1,151 tornadoes. In
Greenland, however, there are no tornadoes; this is indicated in the map below
by the lack of shading over the Greenland region. Also, according to the map below, it is
apparent that Greenland is not located in any global “hotspot” of tornado
activity. A good assumption as to why
there has been an increase in tornadoes over the past 30 years could be
attributed to global warming. Tornadoes
need atmospheric energy in order to develop and sustain itself; as the average
temperature of the Earth increase the energy level as a result also increases,
providing perfect conditions for tornadoes to develop more frequently.
Image taken from: http://icons.wxug.com/hurricane/chrisburt/worldtor.jpg
Info retrieved from: http://www.wunderground.com/resources/education/tornadoFAQ.asp?MR=1
Hurricanes
In order for there to be hurricane formation there needs to
be warm ocean temperatures to initiate evaporation, usually greater than 80
degrees Fahrenheit; a deep ocean layer of warm water so that when the wind
stirs up the water the hurricane will still be maintained by warm water, and Coriolis
to initiate the spinning of the hurricane.
Hurricanes that occur in the Atlantic or East Pacific are called hurricanes,
hurricanes that occur in the Indian Ocean near Australia are called Cyclones and
hurricanes that occur off the cost of China by Indonesia are called Typhoons. The diagram below illustrates the different
regions across the globe that is affected by hurricanes and their respective
names. In the U.S, hurricanes usually
travel westward turning up North and then East this is because they are
affected by the trade winds which also move from East to West. In Greenland there are no hurricanes, as
apparent in the map below. This could be
due to the fact that the water surrounding Greenland is below freezing and not
warm enough to generate any hurricanes.
In the U.S there is an average of 5 hurricanes per every 3 years, that comes
out to about 1.6 hurricanes every year.
Image taken from: http://www.learnnc.org/lp/media/uploads/2009/12/cyclone_map_large.gif
Info retrieved from: http://www.wvec.com/weather/knowledge/Why-do-hurricanes-rotate-counterclockwise--and-move-from-east-to-west-87269957.html
Looks like Greenland and New Zealand both have low amount of hurricanes and tornadoes each year! Although Greenland has zero tornadoes and hurricanes, New Zealand has an average of about seven tornadoes every year and 1 hurricane/cyclones each year.
ReplyDeleteGreenland and Ethiopia are similar in that tornadoes and hurricanes do not form there, though for different reasons. Greenland's temperature is very cold while Ethiopia is fair. The fact that they don't vary much is the reason why these two things don't form.
ReplyDeleteThis article makes no sense.
ReplyDelete