The coverage maps are shown in a three color format, which relates to three estimated signal levels

  • White: Signal level of greater than 18dBuV: Reliable coverage
  • Green: 0dBuV to 18dBuV: picking up a signal is possible but unreliable
  • Red: Less than 0dBuV: Unlikely to receive a signal

Graphical Representation of NOAA Weather Radio Coverage