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How to get the information from other grid cell?

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I want to add an online data assimilation code by using WRFV3.7.1. So that I need to design a new halo region by getting the information form other processor .

I have tried to print value on memory domain and calculate domain, but I can only get value on calculate domain, such as by print psfc(its:ite, jts:jte). The value on halo region is totally zero,such as print psfc(ims:its,jms:jts), which means I can not get neighboring grid information

Can you tell me how to get the information on halo regions ?

Is there any subroutine in WRF can access other processor and grab the neighboring grid information ?
Thanks for your advice

I had posted my question to WRFDA forum