Check/QC NHD-scale gridmet data

[lekoenig]

We've noticed some weird values in the gridmet sw-rad data when comparing our meteorological drivers between the NHM and NHDPlusv2 scales, notably that there's some values that are close to/equal to zero at the NHD-scale but with larger values at the NHM scale (and vice versa). Why is that? It might be useful to start with the NHD-scale data and investigate where the NHD values equal ~zero.