Tonight we'll be watching a surface boundary that will sit tight across eastern Oklahoma and northwest Arkansas. This boundary will provide the focus for showers and storms that will likely train over the same area. Several embedded waves of low pressure at 500 mb will move over the stationary boundary creating the potential for heavy rainfall.

The latest computer model guidance suggests a developing 30 to 40 knt low level jet at 850 mb after midnight. This ribbon of air will interact with the stationary boundary to help sustain showers and storms throughout the overnight period.

Heavy flooding rainfall could become an issue, with some locations picking up and additional 1 to 2 inches of rainfall overnight. QPF is very high, so be very careful if you live around a flood prone area.