1. HYCOM NetCDF is
   1. spatial
   1. single time slice
   1. single variable
 1. Aggregated by THREDDS catalog
 1. Slice for top layer
 1. Constrain bounding box to -98W, +37E, +56N, 0S
   1. Latitude Indixes 365 (inclusive) to 1214 (exclusive)
   1. Full range of Longitude
 1. Collect all times into monthly files
 1. Temp, Salinity, thickness, u, v