Ridging is dominating across most of the central and eastern United States. A cold front associated with a Canadian low pressure system will push into the area over the next 24 hours before a high pressure builds in behind it bringing with it a much needed air mass change. As the flow shifts from a southerly/SW dominated pattern towards a westerly/NW flow that will allow for drier air to settle over the Great Lakes and Ohio River Valleys for the end of the work weak.
Forecast modelling has shifted the remnants of tropical storm Gordon over the Ohio River Valley rather than the Great Lakes. This shift has been picked up in all major modeling suites but shifts are still possible. The remnants will bring high precipitable water content air from the tropics into the ORV that will begin interacting with a stationary boundary left behind from the previous system. This will allow for heavy rain at times that could bring total rain accumulations into the 2-5″ range. Temperatures during this period will be below seasonal averages due a combination of the stalled frontal boundary and duration of the rain event.
Temperatures today will be back in to the 90’s with heat indices topping out near 100. Skies are expected to remain clear with a slight chance of pop-up thundershowers this afternoon. This is the last day of the excessive heat and humidity before the front move into the region tomorrow. Rain chances begin tomorrow and continue through Sunday.