This overlay is a simple reformatting of the DX Cluster WWV announcement messages. The messages are broadcast every 3 hours, commencing at 00Z. The bottom line shows Geomagnetic storm (G) and Radio blackout (R) levels in the past 24 hours and predicted levels for the next 24 hours. See the NOAA reference below for details about these levels.
The messages are broadcast every three hours, and SkookumLogger needs to be connected to a DX Cluster node when a broadcast happens. Alternatively, you can manually request the most recent WWV forecast, or automatically request a forecast when opening a DX Cluster connection; see DX Cluster Preferences .
NOAA Space Weather Scales
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