Running updates: Storms slam Houston, kill 31 in Texas, Oklahoma, Mexico

(CNN)Texas and Oklahoma are praying for a respite following four days of epic rainfall that has killed 18 people. Another 13 people died in Ciudad Acuña, Mexico, when a ferocious tornado ripped through the border town of 180,000.

And after what must have been a hellish Memorial Day weekend for some Texans and Oklahomans, forecasters say the nasty weather -- which left streets in Houston flooded, bayous cresting and tens of thousands of residents without power -- is en route to Louisiana. There, it could dump as much as a half-foot of rain on the southern and central portions of the state.
"This continues to be an extremely dangerous and life-threatening situation," the National Weather Service said.
Follow today's live blog for all the latest updates on this storm system: