Over the last few days data has continued to show a very wet weather pattern (and cooler as well) setting up for the central half of the country to the east/south east.
In the image above (1-5 day mid level flow) we see a weakness in between a strong ridge off the west coast and another ridge over the Atlantic ocean. In this set up fronts will come down from Canada in a north west flow over the Mid west and Plains states, these fronts will likely stall as they encounter the ridge off the south east US coast leading to day after day of stormy weather. This doesn’t look to change much in the 6-10 day forecast and 11-15 day outlook as seen in the next images.
Below is the GFS forecast total rainfall through mid month, each image is from a different day of the same model forecast, thus giving some higher confidence in a wetter cooler weather pattern.
Take the numbers with a gain of salt the idea here is repeated fronts stalling somewhere in the mid section of the country to the south east at times reaching into the North East.
Climate Prediction center also agrees with a wet pattern that should see the coolest of temp readings in the central part of the country thanks to large high pressure system from Canada.