Thunderstorms and rain that ravaged the UK over the weekend are set to continue into this week, tipping out up to half a month's rain today alone, the Met Office has warned

Flash floods can happen at any time, making them unpredictable and hard to prepare for. Even the name “flash flood” implies that they can appear out of nowhere and cause all kinds of damage.

The National Weather Service urged people to avoid travel if a flash flood warning was in place for their area.

Over 100 people have died in the Texas flooding as of Tuesday. Here are answers to commonly asked questions from USA TODAY readers.

Recent flash floods in Texas have sparked a concern across the country when it comes to flood safety and how to know the warning signs of potential deadly situations.On June 30 and July 1, flash floods made their way through South Central Pennsylvania as well,

"Flash floods are basically a rapidly rising flood situation that's caused by a locally heavy rainfall that exceeds an area's ability to absorb or safely channel that overflow water into the creeks and streams," De Block said. In Texas, many rivers and lakes were already swollen from days of rain, making the flash flooding even more dangerous.

Wireless Emergency Alerts are limited to flash flood warnings when there is a "threat tag" of considerable or catastrophic.

Emergency responders continue to search for missing people and local police said efforts have been slowed by "sightseers who are making things worse."

Emergency officials are starting to focus on alert systems as they search for answers about how the flash flooding swept away so many.

One of the worst floods in a Texas rivers' history left dozens dead over the Independence Day weekend. What to know about flash flooding and warnings.