Take a look at AZO hourly from 2/16 - 2/24.  Not only is the hourly trade "high and tight".  The tight action stays tight above 358 and the heavy volume hour on 2/16 pushed up from 355 to 358. 

I use hourly charts to confirm what I think I am seeing on the monthly, weekly & daily chart.  When the monthly, weekly, daily and hourly charts all show tight trade higher in price than the sets of heavy volume pushing up, the market likes to see how far those can go.