On Thu, 28 Aug 2008 20:59:37 -0400, "Fievel Mousekewitz Sr \(Not A
CT'er\)" wrote:


By any chance, by "MB" do you mean Millibars?

Yes

Millibars is a way of measuring barometric preasure. It's in a way
easier to use, and more precise. Inches take up more room on a map, and can
get sloppy.
It's also used to measure isobar's, the lines on a weather map, of equal
pressure.

True. But also dont forget in the case of upper level charts such as
the 500mb chart, the mb level is used to mesure isohights in
decameters above 1000mb (approx sea level)

The lines on a 500mb chart are all 500mb. The diffrent number
associated with each line are the decameters above the 1000mb level.


I can actually look at a map, with just the readings of pressure, and draw
out the lines on my own. would also know if I was looking at a Hurricane just from
the extreme low pressure readings.

Well, there are other things to consider besides the extreme low
pressure to determine if a hurricane exist. For example, does the
system have a tropical origin? Do ground obs support the necessary
wind speed? Does the system have truly closed circulation from
surface through approx 700mb? give or take a little. Is there an
existing high at approx 250mb existing above the system? And is the
water the system over, warm enough to support a hurricane?

Granted, extra tropical storms do develop that have extreme winds and
hurricane pressures at the low center. But by definition is not a
true hurricane.