SQL and Stored Procedure Error Table

I have this bit of code I found online at the end of each of my stored procedures:

ROLLBACK TRANSACTION

         PRINT '-----START: ERROR DETAILS-----'
         PRINT ERROR_NUMBER()
         PRINT ERROR_SEVERITY()
         PRINT ERROR_STATE()
         PRINT ERROR_PROCEDURE()
         PRINT ERROR_LINE()
         PRINT ERROR_MESSAGE()
         PRINT '-----END: ERROR DETAILS-----'

            DECLARE @prmErrmsg NVARCHAR(4000);
            DECLARE @prmErrSvr INT;

            SELECT @prmErrmsg = ERROR_MESSAGE()
                ,@prmErrSvr = ERROR_SEVERITY();

            INSERT INTO dbo.myErrors
                        ([ErrorMessage]
                        ,[ErrorSeverity]
                        ,[DateCreated])
                 VALUES
                        (@prmErrmsg
                        ,@prmErrSvr
                        ,GetutcDate())


            RAISERROR(@prmErrmsg,@prmErrSvr,1)

      

        
        
        
      

    

It writes records to the myErrors table, but does not record the error message or the severity of the error.

My first question is why?

I believe this is due to the severity of the error being in a certain range.

How can I tell it to log verbose error messages ALWAYS regardless of the severity?