itmean
A flag flying at the top of a lighthouse could mean several things, depending on the color and color pattern of the flag. It could mean anything from inclement weather, rough seas, hurricane, shallow water, dangerous rip currents etc.
danger
its flying around the lighthouse
That the president is not home
it means that there is no speical day that day
The duration of Flying the Flag is 1800.0 seconds.
Flying the Flag ended on 1992-08-04.
If a black flag was flying, it meant that the play would be a tragedy
you have to go to the top of the lighthouse and you should see it flying around the middle of the lighthouse.
What are the rules about flying the American Flag
According to the US Flag Code, the US Flag should be larger in size and (if flying on the same pole), at the top of the pole. If flying the American flag with a state flag, the American flag needs to be on a taller pole than the state flag and displayed on the flag's right side. If flying them on poles of equal size, then flying the American flag on the flag's right side is correct.
It means to be patriotic (by reference to flying the flag).