Hodographs.

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Hodographs.

Postby Fu Manchu » Mon Jun 18, 2012 6:07 am

Getting some small part (and large proportion) of my brain round these Hodographs things.

A great way to view winds.

Image

I read this one correctly in that there's pretty strong shear. That's about it though.

ReedTimmer:
"Check out this hodograph for eastern SD at around 6 pm CDT. The large hook-like feature shows the strong wind shear. http://t.co/1BWI0h9u"

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Re: Hodographs.

Postby Pete » Mon Jun 18, 2012 6:59 pm

Bit hard to get the hang of but hodographs (in relation to the atmosphere and wind sheare) are basically a plot of the wind's velocity as a function of time. To plot a hodograph you need the speed shear throughout the whole atmosphere you wish to plot, then transfer that from the hodograph to a trajectory using the basics of Newton's law: dv/dt = f, which is basically the instantaneous rate of change of velocity with respect to time. Finding the helicity values using a hodograph is quite simple once you know how to interpret these things. Finding the projectile's motion involves a lot of specialist mathematics and a decent knowledge of physics helps too.

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