FOREX-Dollar slammed after Powell's bleak U.S. outlook

* GRAPHIC-World FX rates in 2019: http://tmsnrt.rs/2egbfVh* Fed's Powell says trade, global concerns weigh on U.S. economy* Dollar hits session low vs yen, euro after Powell remarks* Markets expect 25-basis-point cut later this month(Adds analyst comment, updates prices)By Gertrude Chavez-DreyfussNEW YORK, July 10 (Reuters) - The dollar retreated on Wednesday after Federal Reserve Chairman Jerome Powell struck a downbeat tone in congressional testimony, saying trade uncertainties and concerns ab