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variables meaning in wrfrst

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Hi all,
There are several variables in wrfrst that do not have a clear meaning or their meanings are confusing. For instance,

float U_1(Time, bottom_top, south_north, west_east_stag) ;
U_1:FieldType = 104 ;
U_1:MemoryOrder = "XYZ" ;
U_1:description = "x-wind component" ;
U_1:units = "m s-1" ;
U_1:stagger = "X" ;
U_1:coordinates = "XLONG_U XLAT_U XTIME" ;
float U_2(Time, bottom_top, south_north, west_east_stag) ;
U_2:FieldType = 104 ;
U_2:MemoryOrder = "XYZ" ;
U_2:description = "x-wind component" ;
U_2:units = "m s-1" ;
U_2:stagger = "X" ;
U_2:coordinates = "XLONG_U XLAT_U XTIME" ;

What's the difference between U_1 and U_2? Similar to V_1 and V_2. Could you explain them a little bit more or add a description in the wrfrst netcdf file? Thank you
The *_1 and *_2 variables are that particular variable at the previous and current time steps. So u_1 is the U component of wind at the previous time step, and u_2 is the U component of wind at the current time step. These are the variables used to create restart files.