Archived Plotted Surface Data and/or Contoured Overlay Maps
Select year, month, date, and time for the display, region, map size, density for plotted data, background color for map, scaling size for plotted data and/or contour labels, first variable, type of contoured or plotted map, contour interval, color of plotted data or line contours, and similar settings can be set for a second variable for an overlay map.
Online archived hourly data go back to July 30, 1998.
The 912x650 size works best for full page 8.5"x11.5" printing, if you select the landscape orientation using the
"Properties" or "Preferences" option of the print window.
NCEP front data that cover N. America are available as an overlay option. Archived 3-Hourly NCEP front data start
at 00Z on 9 February 2001 and end at 09Z on 1 October 2018 and resume again on 1 October 2020. These archived NCEP frontal
position data are available every 3 hours and are valid for 00Z,03Z,06Z,09Z,12Z,15Z,18Z, and 21Z. Choosing an intermediate
hour will return data for the previous valid hour.