Here are the possible solutions for warning sign when sea levels are high clue
Answer
Clue
Relevancy
caysclosed
Clue
Warning sign when sea levels are high?
ptomaineconcourse
Clue
Warning sign at a train station's food court? (NOTE: The original sign, without my additions, actually exists. It's in Grand Central Terminal in NYC, on the lower level — the food court level. The sig
peril
Clue
Rising sea levels, e.g.
Definition
to put in danger, also IMPERIL
attics
Clue
High levels
Definition
ATTIC, a room in the roof of a house
neaps
Clue
Lowest levels of high tides
Lowest levels of high tide
Definition
NEAP, to tend towards the tide of the smallest range