https://tidesandcurrents.noaa.gov/publications/techrpt40.pdf
Report done by NOAA following Isabel
Page 21 in the report has tidal gauge readings vs historical stuff
Looks like the max for the Baltimore gauge was 8.14 feet (on page 22)
So I am 99% sure Baltimore County Schools are idiots and confused coastal flooding with inland flooding. Their email this morning about closing schools mentioned dangerous flash flooding (which, um, what?).
SIGH