Hello GrADS Users,<br><br>I am looking for help plotting 3 hr precip using gfs_hd (from <a href="http://nomads.ncep.noaa.gov">nomads.ncep.noaa.gov</a>) every three hours. I have it working fine using nam and gens. However, when I plot apcpsfc using gfs or gfs_hd, every other hour it seems like it is plotting 3 hour precip, then 6 hour precip, and back to 3 hour, then 6 hour precip all the way through the 65 points. This makes the precip appear to pulsate, every other frame. I have attached two images to illustrate the problem. Does anyone have a work around for this issue? The problem is isolated to just gfs data (both gfs_hd and gfs), but doesn't happen with GFS Ensembles.<br>
<br>Versions:<br>Grid Analysis and Display System (GrADS) Version 2.0.a9<br>Fedora-13-x86_64<br><br>Data source example:<br><br>sdfopen: <a href="http://nomads.ncep.noaa.gov:9090/dods/gfs_hd/gfs_hd20101130/gfs_hd_12z">http://nomads.ncep.noaa.gov:9090/dods/gfs_hd/gfs_hd20101130/gfs_hd_12z</a><br>
<br>Attached files:<br>precip_US_6.png (appears to show 3 hours of precip)<br>precip_US_7.png (appears to show 6 hours of precip)<br><br>Here is my attempt to work around the issue for just gfs_hd / gfs, though it doesn't solve the problem:<br>
(Note: This is the section of my .gs file related to my work around attempt):<br><br>*grads code<br><br>t = 1<br>t0 = 0<br>alt = -1<br>while ( t <= 65 )<br><br>'set t 't<br>'define precip = apcpsfc/25.4'<br>
if alt > 0 then<br> 'define product = precip(t='t')'<br> 'define over4= precip(t='t')'<br>endif<br>if alt < 0 then<br> 'define product = (precip(t=t) - precip(t=t0))'<br> 'define over4 = (precip(t=t) - precip(t=t0))'<br>
endif<br><br>*more grads code<br><br>t = t+1<br>say ' = 't<br>t0 = t0+1<br>say ' = 't0<br>alt = alt * -1<br>endwhile<br><br>Any help here would be greatly appreciated. Thanks again.<br><br>Sincerely,<br><br>
<br>Jeff Chabot<br><a href="mailto:jsc219@gmail.com">jsc219@gmail.com</a><br><a href="http://jeffsweatherservice.com">http://jeffsweatherservice.com</a><br><br><br><br>