First responders rescue people from multiple vehicles stranded in floodwaters on I-35 southbound in Mclennan County Texas overnight.
Flood Watches blanket almost all of South Texas, the middle and upper Texas coasts.
Rescue operations began overnight and continued Monday morning, with several reports of cars stranded amid the rising waters.
Interstate 35 turned into a river as first responders pulled trapped motorists from submerged cars, while further south in Austin, officials have already closed two dozen low-water crossings.
The photo below reveals a car floating down the highway after floodwaters picked it up.
Vehicle floats down I-35 during flooding in Waco, Texas, Monday June 15.
Notably, Texas Game Wardens rescued five people whose vehicle was swept off the road by the strong flooding in Burleson County.
© Texas Game WardensFirst responders work through the night to rescue people amid flooding in Texas.
Crews at the Sisterdale Volunteer Fire Department also continue to respond to incidents involving vehicles and individuals stranded at low-water crossings.
As these severe conditions persist, Governor Greg Abbot announced that he has activated additional State of Emergency response resources amid the flood threat across large portions of Texas this week.
"Texas will work around the clock to deliver all needed resources to communities affected by severe weather," Governor Abbott said. "I urge all Texans and visitors to our state to heed guidance from state and local officials, monitor local forecasts, and make an emergency plan to keep yourselves and your loved ones safe."
Elsewhere across the state, between 3 and 8 inches of rain has swelled waterways and spawned flooding in Boerne, Texas, prompting the city to close its trails until further notice.
According to the National Weather Service, daily storm chances will persist across portions of the state throughout the week, with persistent heavy rain expected to result in flash flooding.
Additional threats include large hail and damaging winds as thunderstorms slam the state.
Comment: Rainfall rates of up to 4 inches per hour were reported in Waco.