Oil prices have continued to rally through May, but I would anticipate some resistance to this soon.USDWTI Daily Chart 5/23(click to enlarge)WTI crude oil is approaching 50.00. The momentum is still strong though. A lack of bearish divergence and the ability of price to tag the upper bollinger band, suggests strong upside. I would look for a few things before calling for resistance.1) Price closer to 50.002) Bearish divergence between the RSI and Price3) price failing to tag the upper bollinger band, unless the band is already sloping down. I think in the medium-term, if price does indeed stall at 50 and turn down, there is downside risk towards the 38-40 area. In the short-term, a more conservative bearish outlook would be towards 43.00 pivot, as well as the bottom bollinger band.