I have noticed many recent graduates in atmospheric science posting their resumes online and I believe they are getting poor advice from their professors. While I retired in 2018 from a high management position in private sector meteorology, we wanted  to see an applicant's entire job history. This especially included working at McDonald's, Wendy's or other jobs where they worked with the public. Working with clients is what private sector meteorologists do! When I was looking at resumes seeing, "Shadowed at National Weather Service, Summer 2017" it was not impressive because there was no actual responsibility and there was little work with the public.  So, if you are at all interested in working in the private sector (commercial meteorology, television, etc.) I recommend posting all of your employment experience.