[Wrf-users] constant field =0 in GRads???

[Fatkhuroyan]

hi...
when i visualize wrfout via Grads,there are some 
parameters that have "constant field value =0 ". ( for my 
cases are psfc,tsk,rainc,rainnc,tc which have constant 
field =0).
Could someone explain to me,why ???
and how to repair ???
Also when i have 9 step_time,there are some parameters 
have value only at t=1,t=5,t=9.others time_step have 
constant field=0,why ???

thank you.............
============================================================================================================================
"Flexi - Gratis bicara sepanjang waktu se-Jawa Barat, Banten dan DKI Jakarta."

"Speedy - Gratis internetan unlimited dari pkl. 20.00 s/d 08.00 se-Jabodetabek, Banten, Karawang dan Purwakarta."
============================================================================================================================
“Nikmati akses TelkomNet Instan Week End Net hanya Rp 1.000/jam. Berlaku untuk Sabtu-Minggu, khusus Jawa Tengah dan DIY s/d 

31 Desember 2008”.
============================================================================================================================
"Kini telah hadir Protector, layanan keamanan online yang dapat digunakan langsung saat menjelajahi internet kapan saja dan 

di mana saja. Dapatkan secara GRATIS layanan Protector hingga 31 Desember 2008. Klik ke: http://protector.telkomspeedy.com".

============================================================================================================================

Ikuti Speedy Blogging Competition 2008, ajang kompetisi Blog yang terbuka bagi semua Blogger dengan tema: Seperti Apa Konten Hebat Menurutmu? Dapatkan hadiah utama 1 Buah Notebook Mininote. Informasi lebih lanjut kunjungi http://lomba.blog.telkomspeedy.com