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20000406: storm relative winds
- Subject: 20000406: storm relative winds
- Date: Thu, 6 Apr 2000 10:59:17 -0600
Mohan,
The ETA212 grids actually have a the U and V storm motion:
64 000406/1200F000 6000 0 HGHT VSTRM
65 000406/1200F000 6000 0 HGHT USTRM
To create a vector from these 2 components,
VECN(USTRM,VSTRM)
Click on the "Vector" and "Layer" radio buttons in the Garp model selection
and chose the 6000:0 lyer from the Height coordinate pop-up.
If you want to specify your own storm motion vector using your own components,
you can just enter their U & V magnitudes like:
VECN(5,-5)
One more way would be to use the VLAV(OBS) function to create an avarage
wind over a layer as a way to specify a storm motion.
Steve Chiswell
Unidata User Support
On Thu, 6 Apr 2000, Mohan Ramamurthy wrote:
> Hi Chiz,
>
> How do I plot storm relative winds in GARP? I see that GEMPAK has a VSUB
> function I could use and subtract out storm motion, but how do I specify
> storm motion as a vector (which would be second argument for VSUB)? Thanks.
>
> Mohan
>
>
> ----------------------------------------------------------------------------
> Dr. Mohan Ramamurthy Email: address@hidden
> Associate Professor Ph: (217) 333-8650
> Department of Atmospheric Sciences Fax: (217) 244-4393
> University of Illinois at Urbana-Champaign
> 105 S. Gregory Street
> Urbana, IL 61801-3070
>
