Observation nudging were not working!?

Topics specifically related to any of the WRF runtime options, such as SST update, DFI, nudging, restarts, global runs, adaptive time step, ndown.exe, tc.exe, moving nest, etc.
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wangxs
Posts: 2
Joined: Fri Jul 24, 2020 3:45 am

Observation nudging were not working!?

Post by wangxs » Fri Jul 24, 2020 4:10 am

I used radar to retrieve the data(u,v), and I had wrote the data(u,v) to little-r according to UCAR's help.
but it cannot make any change when I use observation nudging(&fdda).Can everyone help me? I am willing to your reply.
here is rsl.error.0000 OBS and namelist.input.
Attachments
OBS_DOMAIN101.txt
(6.84 MiB) Downloaded 3 times
rsl.out.txt
(1.06 MiB) Downloaded 4 times
namelist.input
(5.59 KiB) Downloaded 3 times

Ming Chen
Posts: 963
Joined: Mon Apr 23, 2018 9:42 pm

Re: Observation nudging were not working!?

Post by Ming Chen » Fri Jul 31, 2020 5:55 pm

It seems that this case is done successfully.
WRF Help Desk

wangxs
Posts: 2
Joined: Fri Jul 24, 2020 3:45 am

Re: Observation nudging were not working!?

Post by wangxs » Sun Aug 09, 2020 12:33 pm

but the V and U have nothing change when I use NCL to get some pictures. why?

Ming Chen
Posts: 963
Joined: Mon Apr 23, 2018 9:42 pm

Re: Observation nudging were not working!?

Post by Ming Chen » Wed Aug 12, 2020 3:26 pm

Can you extract U and V from the datafile before and after the nudging, then compare them? Note that the changes after nudging usually are not that big. NCL plots may not demonstrate obvious changes, even if the values are changed.
WRF Help Desk

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