What an awesome picture taken over the Bentonville area. This is what we call a shelf cloud, and it's a great indicator of the thunderstorm's gust front. Sometimes these clouds can be mistaken for wall clouds; however, this cloud occurs at the front of the storm, and when you see this type of cloud, you'll quickly experience the cold outflow winds produced by the storm.

Today's MCS (mesoscale convective system) was pretty impressive. We'll expect another round of showers and storms in a similar fashion for early Friday morning. Another wave will drop out of the northwest and head over Oklahoma and Arkansas. The disturbance will interact with a moist boundary layer, and showers and storms will move through. MCS complexes are usually nocturnal, feeding off a strengthening 850 mb low level jet. They typically can produce heavy flooding rainfall, and strong damaging wind gusts.