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my guess is that she will max out sometime between midnite and 5 am. and then slowly weaken when she moves NW over a bit cooler waters
currently , she has exceptional upper level divergene, and shear is still low
she has moved partially over the gulf stream, while her center is now over waters deeper and a bit warmer than earlier today
should she stay on a north heading for another 6 hours , i think there is potential for her to get down to 987 mb by midnite and possibly as low 982 by 4 am or so and reach cat 1 intensity (65 knots) maybe 70 (knots) should she wrap her west side
in deep convection (even a skinny little bit) this will likely happen IMO.
if not and her loops still look like this by 11 pm then
http://www.ssd.noaa.gov/goes/flt/t1/loop-bd.html a lop sided 988'ish 65 mph tropical storm is what i think she will reach