Dataset Citation: U.S. Fleet Numerical Meteorology and Oceanography Center, 1979: U.S. Navy Northern Hemisphere Daily (and Monthly) Sea-Level Pressure and 500 mb Height Grids for 1946Jan to 1993Dec. Dataset ds018.0 published by the CISL Data Support Section at the National Center for Atmospheric Research, Boulder, CO, available online at http://dss.ucar.edu/datasets/ds018.0/.
