From trhe manual:
WB
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See H in LCD Display Examples. Broadcast by the National Oceanic and Atmospheric Administration (NOAA) National Weather Band (WB) frequencies are available in North America only.
To receive NOAA weather alerts while listening to other radio bands, highlight the Alert indicator in the WB display by pressing the soft key. An alert tone will automatically switch the receiver to the announcing WB channel regardless of which frequency band is playing.
thank you. i will be trying this tonight. will update after
When equipped with the CB module, use the soft key to highlight the Alert indicator in the LCD display. Weather alerts are announced over other audio and the Alert indicator is highlighted in the display.
https://www.harley-davidson.com/en_US/Content/Pages/Owners/om/2012/en/TOURING/file-5.comp