Pattern change by Saturday, July 20th brings better rain chances
GFS forecast for scattered thundershowers on Saturday, July 20th
An amplified pattern will make for a hot and humid week across much of the country. High temperatures will reach the low 90s in Nashville today - check the first image to see that the impressive heat is predicted to stretch across the entire eastern half of the country.
A large upper ridge of hot high pressure centered over Ohio and Pennsylvania can be seen in the second image. As that ridge drifts slightly southward tomorrow, Nashville can expect middle 90s for afternoon highs! While that ridge hangs tough through Friday, highs will stay in the mid-90s. You can also spy an upper level low over Oklahoma and Texas today; the rainfall in that region is much-needed and will make a small dent in their big drought.
By the end of the week, the weather pattern aloft gets back to a more typical west-to-east flow across the northern half of the contiguous United States. The third image shows the GFS model's upper level forecast for Saturday. A trough of low pressure drops from the Upper Midwest through the Great Lakes down to the Mid-South. That will mean a higher chance of rain and storms from Friday through the weekend - the fourth image depicts the GFS model's rain chance on Saturday, July the 20th.