A Flash Flood Watch is in effect for the entire area until Friday at 1pm.
In Cooke and Denton counties, rain totals have already reached nearly a foot– turning roads into rivers.
A portion of I-35 had to be blocked off for a couple of hours, causing backups Thursday morning. Some drivers, who tried braving the high flood waters were nearly washed away and had to be rescued.
The National Weather Service says levels at Lake Ray Roberts and Lewisville Lake will increase steadily over the next couple of days.
Given how hot and dry Texas normally is in July, the sight of raindrops is pretty sweet.