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
