USD/JPY is rising the bid after a weaker dollar overnight and trades back on the 100 handle with a high of 100.37 so far from 99.90 lows.

USD/JPY ranged sideways between 99.75 and 100.50 overnight but has caught a bid with Fed's Kaplan saying that there is room for the Fed to maneuver on rates, backing Dudley overnight with the same style of rhetoric while Kaplin also suggested that Brexit effect is manageable in US. As far as data, analysts at Westpac explained, "The US jobless claims for the week to 13 Aug fell to 262k, slightly better than the 265k expected. Philadelphia Fed business activity bounced from -2.9 to 2.0, as expected, although the components were weaker than the headline suggested. The Conference Board’s leading economic indicators index rose 0.4% in July, vs 0.3% expected."

How volatile has USD/JPY been?

2-Standard Deviation Volatility Bandwidth is presently at 71 pips and shrinking on the hourly USD/JPY chart, while the ATR (14) is currently at 21 pips.2-Standard Deviation Volatility Bandwidth is at 766 pips and shrinking on a daily chart. Over the last four weeks, the average movement for the present session has been 21 pips per hour.
Further, today’s peak period for volatility is between 3:00-4:00 GMT, which sees an average movement of 85 pips over the previous four week period.

What price levels and patterns have to be considered?

Current price is 100.31, with resistance ahead at 100.36 (Daily High), 100.38 (Daily Classic R1), 100.50 (Weekly Classic S1), 100.51 (Yesterday's High) and 100.55 (Hourly 100 SMA). Next support to the downside can be found at 100.08 (Hourly 20 EMA), 100.01 (Daily Classic PP), 99.89 (Daily Open), 99.89 (Monthly Low) and 99.89 (Weekly Low). 
Looking at price patterns, we can see a Piercing Line 4-hour candlestick formation, .