Twister pics reveal wide swath of destruction

>>> good evening. we've already seen what the storm can do. and over the next three days, this one storm system and all its related offshoots will churn its way from west to east across this country. and before it's over, this storm system may impact 150 million americans. we have already set an all-time record for tornadoes in april alone. there's more flooding and severe weather on the way. as we said, 150 million of us will feel this storm and upwards of 30 separate states across 40 pe pest% of the lower 48. we start off with two reports, beginning with john yang in st. louis. good evening.

>> reporter: good evening, brian. officials say flights here are about 85% to 90% of normal today. tomorrow, they hope to return to 100%, but they say returning the terminal to normal will take months. today, business as usual at the st. louis airport. passengers coming and going as the work week begins. a far cry from how travelers along one row of gates watched the storm bear down on them. a security camera shows the fierce storm turning the concourse into a terrifying wind tunnel , sending flying pieces of debris through the air.

>> there was this gust of wind and it came through the checkpoint, and windows were breaking and glacracking and glass went everybody.

>> reporter: part of the roof peeled away, jetways crushed.

>> all the alarms started going off, and people were spooked, and the tsa members came running down saying get into the bathroom. get into the bathroom.

>>> at least two planes rode out the storm on the star mack.

>> we were moved about 15 feet.

>> reporter: miraculously, no one was seriously injured. people credit an early warning system .

>> police said we have to move to the shelters, people didn't resist. rrtd across the area, people are picking up the pieces . the tornado tracked 22 miles, damaging more than 700 homes, destroying more than 100.

>> it seems to me four or five minutes of pure hell.

>> reporter: one tornado upending thousands of lives.

>> 30 seconds, everything was gone. rrtd tonight, more rain, more worries, in poplar bluff , missouri, about 175 miles west of here, officials are evacuating about 1,000 people. grounds are so waterlogged, they're threatening a levee failure.

>> john yang , unbelievable scene. we