[gradsusr] More on hurricane track forecast graphics

[revathi cherry]

Thank You So much Jennifer! I have successfully got my result output.





With Regards!

*Gandiboyina Revathi*
Research Scholar
Department of Meteorology and Oceanography
Andhra University.





On Mon, Sep 18, 2017 at 6:25 PM, Jennifer M Adams <jadams21 at gmu.edu> wrote:

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>
> Many have asked me for the code to draw cyclone tracks. My scripts to draw
> these plots are still under development and are being hardened with every
> forecast cycle. I will share when they are ready. The core of the algorithm
> is below, starting with a ulon/ulat that are close to the center of a local
> minimum in sea level pressure:
>
> 'set lon 'ulon
> 'set lat 'ulat
> dimexpr='lon='ulon-radius',lon='ulon+radius',lat='ulat-
> radius',lat='ulat+radius
> * get the grid coordinates
> 'd aminlocx(mslp.1,'dimexpr')' ; minlocx=subwrd(result,4)
> 'd aminlocy(mslp.1,'dimexpr')' ; minlocy=subwrd(result,4)
>
> * Convert the grid coordinates to lat/lon, save in a script variable
> 'set x 'minlocx ; minlon.e.t=subwrd(result,4)
> 'set y 'minlocy ; minlat.e.t=subwrd(result,4)
>
> The above code is in a loop, so that each minlon/minlat becomes the
> starting point (ulon/ulat) for the next time step/ensemble. After I have
> all the slp minimum location data for each ensemble member and time step,
> then I draw the lines. Start with an empty lat/lon map to set up the
> scaling, then use ‘q w2xy’ to get the page coordinates for each point and
> save them in another script variable. Connect the points with ‘draw line’:
>
> *   get the page coordinates
> 'q w2xy 'minlon.e.t' 'minlat.e.t
> minx.e.t=subwrd(result,3)
> miny.e.t=subwrd(result,6)
> *   draw the line
> tm1=t-1
> 'draw line 'minx.e.tm1' 'miny.e.tm1' 'minx.e.t' ‘miny.e.t
>
> Bells and whistles include the background map, line styles and colors,
> mark types and sizes, watches and warnings and position data from NHC,
> annotation, and the wind masks, which are defined using the following
> expressions:
>
> 'spd39=sum(sum(const(const(maskout(mph.2,mph.2-39),1),0,-
> u),t=1,t='tfinal'),e=2,e='efinal')'
> 'spd58=sum(sum(const(const(maskout(mph.2,mph.2-58),1),0,-
> u),t=1,t='tfinal'),e=2,e='efinal')'
> 'spd74=sum(sum(const(const(maskout(mph.2,mph.2-74),1),0,-
> u),t=1,t='tfinal'),e=2,e='efinal')'
>
> That ought to be enough to get you started drawing your own cyclone
> tracks.
>
> In the meanwhile, here is my latest, with Jose and Maria:
>
>
>
>
> On Sep 7, 2017, at 3:40 PM, Frank Colby <Frank_Colby at uml.edu> wrote:
>
> Jennifer,
>
> Beautiful map!  Would you share the script?
>
> Thanks,
> Frank Colby
> UMass Lowell
>
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>
> --
> Jennifer Miletta Adams
> Center for Ocean-Land-Atmosphere Studies (COLA)
> George Mason University
>
>
>
>
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