The system runs unattended on a Linux based PC. Radiation monitoring data are collected in real-time. Eighteen hour forecast meteorological fields are obtained four times each day (0000, 0600, 1200, and 1800 UTC) and the previous six hours of monitoring data are plotted. The upwind trajectories are then computed at three different levels for the trajectories that arrive near the end of each six hour sampling window. The time of trajectory arrival is indicated on the top of the plot and the final graphics are then automatically uploaded to the web site. The UTC time of the upload is indicated in the first column next to each graphic. The times should be used to determine the most current graphic. Previous day's graphics for the last month are available from the monthly archive page.
Conversion of UTC (Greenwich or Z time) to Eastern Time:
0000 UTC = 2000 EDT = 1900 EST
0600 UTC = 0200 EDT = 0100 EST
1200 UTC = 0800 EDT = 0700 EST
1800 UTC = 1400 EDT = 1300 EST