We do have some concern that rainfall may end up higher on
Nantucket. Although it is a low chance, HREF and CAMs suggest
maximum rainfall totals could approach 5" there which would lead
to more significant poor drainage flooding. Confidence is not
high enough to issue Flash Flood Watches at this time, since we
do not see all factors coming into play that would tend to favor
excessive rainfall. This includes position of upper jet, which
will be over SNE and should keep stronger synoptic scale lift
farther offshore (as opposed to more favorable position across
northern New England), and PWATs staying just below 2" with axis
of higher moisture offshore.
meh