CNN’s Ed Lavandera is on the ground in Texas as volunteer search and rescue teams look for those still missing after floodwaters swept through the Guadalupe River area.

KERRVILLE, Texas (AP) — Over the last decade, an array of Texas state and local agencies missed opportunities to fund a flood warning system intended to avert a disaster like the one that killed dozens of young campers and scores of others in Kerr County on the Fourth of July.

A "considerable" flash flood warning has been issued in Boston as heavy, life-threatening rain pounds the city and areas to the south. Two to 4 inches of rain has fallen so far. Rainfall rates are reaching up to 2 inches per hour.

Bill Nye claims climate change has worsened Texas flooding disasters, arguing that the U.S. government needs to take climate change more seriously.

With rain coming down so fast, storm drains couldn't handle the deluge of water. On Interstate 93 in Quincy, all were lanes closed at one point because of extreme flooding during rush hour. At least five cars were stuck on the highway until the water receded.

The data also highlights critical risks in other areas along the Guadalupe River in Kerr County, revealing more than twice as many Americans live in flood prone areas than FEMA's maps show.

Communities south of Boston have seen as much as 4 and a half inches of rain, with a flash flood warning still in effect.

The warning is in effect until 9 a.m. for Boston and several communities south of the city, according to the National Weather Service.

Back-to-back flooding disasters in recent years — in Texas, New Mexico and Kentucky, among many others — have showed that preparing for flash flooding is a new necessity as the planet warms.