Re: [gembud] Isallobaric wind using NARR data

• To: Peter Banacos - NWS Federal <peter.banacos@xxxxxxxx>, "<gembud@xxxxxxxxxxxxxxxx>" <gembud@xxxxxxxxxxxxxxxx>
• Subject: Re: [gembud] Isallobaric wind using NARR data
• From: "Tyle, Kevin R" <ktyle@xxxxxxxxxx>
• Date: Mon, 22 Apr 2013 15:26:17 +0000

I suspect, given that the ISAL function accepts only one scalar field (e.g. 
HGHT), that there may be no way to do this with more than one input GDFILE.  
You may need to use gdcfil and gdmod to create and populate a single GEMPAK 
grid file that has all the times you will be computing the isallobaric wind 
over.  But I am prepared to be wrong ... :D

--Kevin

_____________________________________________
Kevin Tyle, Systems Administrator
Dept. of Atmospheric & Environmental Sciences
University at Albany
Earth Science 235, 1400 Washington Avenue
Albany, NY 12222
Email: ktyle@xxxxxxxxxx<mailto:ktyle@xxxxxxxxxx>
Phone: 518-442-4578
_____________________________________________

From: gembud-bounces@xxxxxxxxxxxxxxxx [mailto:gembud-bounces@xxxxxxxxxxxxxxxx] 
On Behalf Of Peter Banacos - NWS Federal
Sent: Monday, April 22, 2013 11:07 AM
To: <gembud@xxxxxxxxxxxxxxxx>
Subject: [gembud] Isallobaric wind using NARR data

List:

Has anyone ever tried plotting the isallobaric wind (vectors or magnitude) 
using NARR data? I've tried multiple possibilities using GDPLOT2, but it 
doesn't seems to recognize the assigned time range across two separate files 
(F000 from files spaced 3-hrs apart). Presumably it's just a syntax 
problem...any ideas?

 GDFILE   = narr-a_221_20030212_0000_000.gem+narr-a_221_20030212_0300_000.gem
 GDATTIM  = 0000F000!0300F000
 GLEVEL   = 925!925
 GVCORD   = PRES!PRES
 PANEL    = 0
 SKIP     = 0
 SCALE    = 0!0!0!0
#GDPFUN   = knts(mag(ISAL))
GDPFUN   = knts(mag(ISAL(HGHT^030212/0000F000+2,HGHT^030212/0300F000+1))
<etc>

--
Peter C. Banacos, Lead Forecaster
NOAA/National Weather Service
WFO Burlington, VT
weather.gov/btv<http://weather.gov/btv>
E-mail: peter.banacos@xxxxxxxx<mailto:peter.banacos@xxxxxxxx>
Phone: (802) 862-2475

• References:
  • [gembud] Isallobaric wind using NARR data
    • From: Peter Banacos - NWS Federal