Steady blue - clear view
Flashing blue - clouds due
Steady red - rain ahead
Flashing red - snow instead.
and an addendum
If you happen to see flashing red lights during baseball season, don't dig out your boots. Red Sox fans know that flashing red means that the game at Fenway is canceled.
i have been trying to rember the poem for MONTHS now. esp. when trying to explain the significance to emerson freshman. i now feel fully accomplished