can someone tell me
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stormandan28
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can someone tell me
why Katrina is suppose to turn northwest eventually is there a trough and where is it located?Thanks just currious.
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HurricaneGirl
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I wish I could help, but I don't have the first clue. 
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vacanechaser
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Yes, there is a trough expected to dig in the center of the country and amplify. That will dig to near the Gulf coast and turn the flow from the southwest and turn her to the northwest and northeast.
Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team
Jesse V. Bass III
http://www.vastormphoto.com
Hurricane Intercept Research Team
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I'll try...I'm going to simplify a lot, and hope that a prof met will correct if I screw this up.
Take a look at this satellite shot with 500 MB heights on it (500 MB is about halfway up in the atmosphere. A good level to look at to give us a lot of information on what's going on):
http://www.meteo.psu.edu/~gadomski/SATANL/recent.html
See that bullseye over W canada? With the lower numbers on it? That is a closed low at 500 MB. (the lines represent heights, not pressures, but that's for a whole other post--same thing really). Again, I'm not a professional met, but little extensions of this closed low--like the little dip southwestward of the green lines over idaho represent an extension of that low pressure--an extended area of low pressure--in this case, a southward dip of the height lines--is a trough.
(PS--you don't always have to have a closed low to have a trough)
From what I've seen in a very, very quick look at the models, this closed low, along with those little "short wave" troughs (another discussion for another time) will cross canada. As it does (again, simplifying things terribly), upper level wind patterns change, "guiding" the storm differently.
Hope this helps, again, all feel free to pile on/add comments/questions.
Take a look at this satellite shot with 500 MB heights on it (500 MB is about halfway up in the atmosphere. A good level to look at to give us a lot of information on what's going on):
http://www.meteo.psu.edu/~gadomski/SATANL/recent.html
See that bullseye over W canada? With the lower numbers on it? That is a closed low at 500 MB. (the lines represent heights, not pressures, but that's for a whole other post--same thing really). Again, I'm not a professional met, but little extensions of this closed low--like the little dip southwestward of the green lines over idaho represent an extension of that low pressure--an extended area of low pressure--in this case, a southward dip of the height lines--is a trough.
(PS--you don't always have to have a closed low to have a trough)
From what I've seen in a very, very quick look at the models, this closed low, along with those little "short wave" troughs (another discussion for another time) will cross canada. As it does (again, simplifying things terribly), upper level wind patterns change, "guiding" the storm differently.
Hope this helps, again, all feel free to pile on/add comments/questions.
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