The upper level pattern is finally beginning to change. The high-pressure centered near the 4 Corners region of the country will slowly deepen and expand eastward. The atmosphere is already beginning to show signs of these changes with the moisture content beginning to drop off. Drier air is starting to mix into the lower and mid layers of the atmosphere. It’s still high enough to support likely precip chances around 40-50% through this evening. Increasing subsidence and dry air in the column will substantially stunt convection Thursday and Friday. A disturbance through the Ohio River Valley and Appalachian Mountains may bring a few storms across northern fringe of the area along the northwesterly flow.
Moving into the weekend, continued low rain chances combined with compressional heating means high temps will likely begin to soar into the mid-90s. Saturated soils will help to maintain high low level moisture. Mid 90s air temps will mid to upper 70 dew-points are the perfect recipe for heat advisory conditions. Any reprieve from that heat will likely be on seabreeze and/or outflow boundaries.