Scattered showers and thunderstorms will continue this morning across portions of northeast Oklahoma, mainly north of I-44. Gusty winds, brief heavy rain and dangerous lightning will be likely in the stronger thunderstorms. A few additional storms could redevelop across these same areas this afternoon, although coverage should remain fairly isolated. Hot and humid conditions will develop this afternoon with highs in the lower to mid 90s. Heat indices in the 103 to 108 degree range is expected across portions of eastern Oklahoma and west-central Arkansas. Heat indices will again climb into the 103 to 108 degree range Sunday afternoon. Strong southerly winds will develop on Monday as surface low pressure develops over the High Plains. Shower and thunderstorm chances will begin to increase Tuesday and Wednesday as a frontal boundary approaches from the north.