Re: [gembud] GEMPAK Script Question

• To: "Jeffrey Krob - NOAA Federal" <jeffrey.a.krob@xxxxxxxx>, gembud@xxxxxxxxxxxxxxxx
• Subject: Re: [gembud] GEMPAK Script Question
• From: "Patrick L. Francis" <wxprofessor@xxxxxxxxx>
• Date: Tue, 11 Feb 2020 16:12:12 +0000

think of it as saying to create a vector grid where urel is not null :)

------ Original Message ------
From: "Jeffrey Krob - NOAA Federal via gembud" <gembud@xxxxxxxxxxxxxxxx>
To: gembud@xxxxxxxxxxxxxxxx
Sent: 2/11/2020 10:57:35 AM
Subject: [gembud] GEMPAK Script Question

All,

GEMPAK 'newbie' here - came across a script which is passed to the DG_GRIDN routine as the following:

custar = 'mul(acos(quo(mul(mag(vasv(vecr(urel,0),geo)),quo(urel,mag(vecr(urel,0)))),urel)),RTD)'

Question; concerning the 'vecr(urel,0)' portion, I understand this is a call to the DV_VECR (S1, S2) routine to create a vector from 2 scalars. However, with the second argument being a '0', is this only returning the 'U' portion of the U/V wind vector or is something else going on here?

Thanks in advance,
Jeff Krob
NOAA/NESDIS

• References:
  • [gembud] GEMPAK Script Question
    • From: Jeffrey Krob - NOAA Federal