Comments on: Day 57: 12 UTC Surface Pressure Chart http://www.patricktmarsh.com/2010/02/day-57-12-utc-surface-pressure-chart/?utm_source=rss&utm_medium=rss&utm_campaign=day-57-12-utc-surface-pressure-chart Tue, 31 Jan 2012 00:48:00 -0600 hourly 1 http://wordpress.org/?v=3.3.1 By: pmarsh http://www.patricktmarsh.com/2010/02/day-57-12-utc-surface-pressure-chart/#comment-202 pmarsh Sun, 28 Feb 2010 01:53:59 +0000 http://www.patricktmarsh.com/?p=919#comment-202 Interesting question. Even though I use the terminology frequently, I don't think I've ever really stopped to think about the answer to your question. There is some subjectivity. I tend to operate under the assumption that if I can visualize or draw a circle in the general vicinity of the lowest pressure without much effort then I'll consider it a closed low. In other words, I can recognize one when I see one, but am not too sure I can give a specific definition. Interesting question. Even though I use the terminology frequently, I don’t think I’ve ever really stopped to think about the answer to your question. There is some subjectivity. I tend to operate under the assumption that if I can visualize or draw a circle in the general vicinity of the lowest pressure without much effort then I’ll consider it a closed low. In other words, I can recognize one when I see one, but am not too sure I can give a specific definition.

]]> By: Greg Blumberg http://www.patricktmarsh.com/2010/02/day-57-12-utc-surface-pressure-chart/#comment-201 Greg Blumberg Sat, 27 Feb 2010 18:12:27 +0000 http://www.patricktmarsh.com/?p=919#comment-201 I was trying to figure this out at my OWL shift last night...but how do you define an area of pressure that is completely closed off? Is it indicated by whether or not a isobar makes a complete full circle around an area of low pressure? My problem with this definition is that a low being "closed off" would then become a human judgment that can be (prone to error by lack of data in certain areas) call rather than a certain atmospheric state. In summary: how exactly do you define this closed off low and what is the significance of it? I was trying to figure this out at my OWL shift last night…but how do you define an area of pressure that is completely closed off? Is it indicated by whether or not a isobar makes a complete full circle around an area of low pressure? My problem with this definition is that a low being “closed off” would then become a human judgment that can be (prone to error by lack of data in certain areas) call rather than a certain atmospheric state.

In summary: how exactly do you define this closed off low and what is the significance of it?

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