Long Range: Cooler, active pattern ahead for Central US
Far away from the United States, in the equatorial Pacific, a propagating MJO has some ideas as to how the weather pattern will evolve through early October. Okay, maybe that’s not exactly how it works. But the development of an MJO wave will, in fact, aid in the patterns progression over the United States through the end of September. The instra-seasonal traveling pattern of convection more affectionately known as the MJO (Madden Julian Oscillation) has significant impacts on our weather, and this occurrence will be no different. You can read more about the MJO right here.
While the MJO has been stuck in a period of inactivity over the past several weeks, the overall hemispheric pattern has fallen into a bit of a lull. Wash, rinse, repeat has been the overall terminology used. Occasional cold fronts and troughs have brought periods of below normal air to the Central United States while, by and large, the East Coast has remained at the mercy of a large Southeast US and Western Atlantic ridge.