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weather beacon with red and blue lights, which use a code to present the local weather forecast, using a popular rhyme as a mnemonic:
Steady blue, clear view.
Flashing blue, clouds due or changes due.
Steady red, rain ahead.
Flashing red, snow instead.
During baseball season, flashing red means the Boston Red Sox game has been called off on account of weather.
what does the white light on top mean