NEW : Two people injured in flash flooding ; none seriously . NEW : Severe thunderstorm watch issued in part of state . State of emergency declared in 59 counties . Flash flood warnings continued through 10 a.m. UTC ; some neighborhoods evacuated .
NEW : 136 people injured in Oklahoma flooding ; none seriously . NEW : Severe thunderstorm watch remains in part of state . State of emergency declared in 59 counties . Flash flood watch extended through 7 a.m. Tuesday ; some neighborhoods evacuated .