[size=5]in my own studies of meteorology .. the barometric pressure is key thing to watch hourly changes on to determine strengthening or weakening … Any thing below 1,000mb is a major hurricane … and some of the world record CAT 5 storms have gone even below 900 … Harvey is very slowly strengthening with heating of day as follows … This almost looks like a 2017 version of Allison …
http://www.nhc.noaa.gov/#Harvey
EDT times 6am=950mb 10am=948mb 11am=947mb[/size]