WAVERLY (AP) — Search crews worked through shattered homes and tangled debris on Monday, looking for about a dozen people still missing after record-breaking rain sent floodwaters surging through rural Tennessee, killing at least 22 people.

Saturday's flooding took out roads, cellphone towers and telephone lines, leaving people uncertain about whether family and friends survived the unprecedented deluge, with rainfall that more than tripled forecasts and shattered the state record for one-day rainfall. Emergency workers were searching door to door, said Kristi Brown, coordinated school health and safety supervisor with Humphreys County Schools.

Many of the missing live in the neighborhoods where the water rose the fastest, said Humphreys County Sheriff Chris Davis, who confirmed the 22 fatalities in his county and said 12 to 15 people remain missing. The names of the missing were on a board in the county's emergency center and listed on a city of Waverly Facebook page, which is being updated as people call in and report themselves safe.

"I would expect, given the number of fatalities, that we're going to see mostly recovery efforts at this point rather than rescue efforts," Tennessee Emergency Management Director Patrick Sheehan said.

The Humphreys County Sheriff Office Facebook page  filled with people looking fo r missing friends and family. GoFundMe pages asked for help for funeral expenses for the dead, including 7-month-old twins swept from their father's arms as they tried to escape.

The death of the twins was confirmed by surviving family members. A foreman at country music star Loretta Lynn's ranch also died. The sheriff of the county of about 18,000 people some 60 miles (96 kilometers) west of Nashville said he lost one of his best friends.

Up to 17 inches (43 centimeters) of rain fell in Humphreys County in less than 24 hours Saturday, shattering the Tennessee record for one-day rainfall by more than 3 inches (8 centimeters), the National Weather Service said.

School was canceled for the week, according to the sheriff's office. Waverly Elementary and Waverly Junior High suffered extensive damage, according to Brown, the schools health and safety supervisor.

Tennessee Gov. Bill Lee toured the area, calling it a "devastating picture of loss and heartache." President Joe Biden offered condolences to the people of Tennessee and directed federal disaster officials to talk with the governor and offer assistance.

Just to the east of Waverly, the town of McEwen was pummeled Saturday with 17.02 inches (43.2 centimeters) of rain, smashing the state's 24-hour record of 13.6 inches (34.5 centimeters) from 1982, according to the National Weather Service  in Nashville, though Saturday's numbers would have to be confirmed.

A flash flood watch was issued for the area before the rain started, with forecasters saying 4 to 6 inches (10 to 15 centimeters) were possible. Before Saturday's deluge, the worst storm recorded in this area of central Tennessee had been 9 inches (23 centimeters) of rain, said Krissy Hurley, a weather service meteorologist in Nashville.

"Forecasting almost a record is something we don't do very often," Hurley said. "Double the amount we've ever seen was almost unfathomable."