Thundering down between the Argentina and Brazil border,
the roaring Iguazu Falls can be heard from kilometers away!
Figure 1. Water from the Iguazu River, an important tributary off
of the Parana River, rushes off a plateau creating the falls. (Video taken by me)
Figure 2. Iguazu Falls is located in the North-East part of Argentina.
http://www.google.com/imgres?imgurl=http://www.hillmanwonders.com/z_location_map/south_america/map_iguazu_falls.gif
Condensation occurs often in this subtropical climate because of it's 75%-90% relative humidity. As water evaporates from the rivers nearby, clouds are formed due to adiabatic cooling. Once the air temperature falls below the dew point, the relative humidity rises to 100%, and the air cools, precipitation is produced near Iguazu Falls.
Figure 3. With this location being in a subtropical high region,
subsiding air is warm and provides stable weather.
http://www.google.com/imgres?imgurl=http://earthsci.org/processes/weather/cyclone/cyclone4.gif
Iguazu Falls does receives many thunderstorms as a result of moisture and unstable air. As warm moist air lifts adiabatically and condenses, cumulus-type clouds are formed.
Figure 4. This picture that I took shows a great example of
Cumulonimbus thunderclouds developing behind Iguazu Falls.
As a result of these thunderstorms, lightning brings hazzard to the community living nearby. When opposite charges attract each other, a visible stroke can be seen as a stepped leader and a traveling spark meet.
Figure 5. This picture shows a great example of a
"Bolt from the Blue" lightning strike at Iguazu Falls.
http://www.google.com/imgres?imgurl=http://2.bp.blogspot.com/_ddqtkOiADuo/
TDIaLgZ_ymI/AAAAAAAAEuM/x75fJQinlXQ/s1600/iguazu-falls-brazil.jpg
Tornadoes also post a threat in a nearby region of Iguazu Falls. These tornadoes are created after a strong cold front separates really hot air from really cold air, a big humidity difference, and a jet stream pulls up air from the surface.
Figure 6. As a result of this tornado in Argentina, 6 locals
were killed and more than 100 people were injured.
http://www.google.com/imgres?imgurl=http://www.inthenews.co.uk/photo/a-tornado-
hit-argentina-yesterday-leaving-at-least-six-dead-%2415671%24300.jpg
Works Cited
http://www.iguassufallstour.com/main.php?run=articles&key=51#art180
http://gosouthamerica.about.com/cs/southamerica/a/IguazuFalls.htm
http://www.greatestplaces.org/notes/iguazu.htm
Great post! You really condensed your information in a concise manner, and gave plenty of pictures which helped reaffirm my understanding. I can tell you have a clear definition of these terms, and liked how you incorporated so many forms to their processes. I would recommend a few transitions between topics, but otherwise it was very informative.
ReplyDeleteYour blog does a good job of describing the forms and processes we have discussed in class. The video of the Iguazu Falls is awesome! I like where you talk about how the clouds form and the precipiation that occurs around the falls. I would have never thought about the thunderstorms possible until you explained how the unstable air can affect the area. It would be crazy if a tornado happened right around the area of the falls, that would be a very interesting sight. Overall, your blog is very desriptive and backs up the content we have discussed in class.
ReplyDeleteGood job!
Jason
Before taking this class and reading your blog I would not have connected a large waterfall as a contributer to thunderstorms. I would have just assumed that it was other weather forces that were causing the thunderstorms. In actuallity the unstable air and humidity caused by the waterfalls is a main contributer to the local thunderstorms. Great explanation and vivid pictures.
ReplyDelete