skew-T from ECMWF grid data

[Daniele Gandini]

Mario,

wind direction is clockwise from North:

'define wdir=180+atan2(u,v)*180/3.14'  

To see the moist adiabats set DrawThtw= 1   

Bye

Daniele



  ----- Original Message ----- 
  From: mario frangipane 
  To: GRADSUSR at LIST.CINECA.IT 
  Sent: Thursday, September 27, 2007 6:19 PM
  Subject: Re: skew-T from ECMWF grid data


  Daniele, thank you very very much for your message!

  I have created a Skew-T diagram using the script of Bob Hart and the ECMWF grid data.  :-)

  The archive of ECMWF do not contain the dewpoin temperature and wind direction and I must calculate them.

  But, how is calculated the wind direction? (clockwise? from nord?)

  Moreover, the moist adiabats are not drawn!  :-(

  Bob Hart write:

  http://moe.met.fsu.edu/~rhart/skewfaq.html#Q7

  "Some versions of 1.6 and 1.7 had a bug that produced math errors when calculations were performed in scripts. The lastest beta version (1.7 beta 9) fixes the error" 

  But I use GrADS 1.8!

  You can still help me?

  Thank you very much!

  Regards,

          Mario





  Daniele Gandini <Daniele.Gandini at ARPA.PIEMONTE.IT> ha scritto:
    Hello Mario,

    it is very simple.

    First you set on a lat-lon point and on all vertical levels:

    'set lon 'lonp
    'set lat 'latp
    'set z 1 '_NLEV

    then you run skew script written by Bob Hart that you can download from

    http://moe.met.fsu.edu/~rhart/skew.html



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