Tonight, the unrelenting severe weather threats from coast to coast, California bracing for another round of high-intensity rain, while new bands of dangerous lake-effect snow pummel the northeast. Flood waters overwhelming roads in San Diego, cars submerged, entire blocks covered with water, and more heavy rain is on the way.

Millions under alert tonight and flight delays already stacking up, kicking off one of the

busiest travel weekends of the year.

The terrifying new details about what caused a deadly New Year's Eve fire, officials blaming

sparklers in champagne bottles for

an inferno leaving dozens dead.

How one survivor made it out alive and the mother still trying to find her missing son.

Foiled terror plot, a North Carolina teen charged with planning an ISIS-inspired New Year's

Eve attack using hammers and butcher knives,

how the FBI says it stopped him. Search for a killer, a dentist and his wife fatally shot

inside their home with their young children nearby, the manhunt tonight. The chaotic traffic stop,

a man trying to flee on foot, tackled by officers, a teen speeding

away in a truck, then slamming into a police car.

Scary moments, a stunt at a bowl game going off course when a man in a parachute is suddenly

caught in the goalpost netting before falling to the ground.

Inside NASA's new mission, the astronauts preparing to travel deeper into space than any human ever before.

And freezing canine rescue, firefighters breaking through ice to save a yellow lab trapped in a frozen pond. Nightly News starts right now.

This is NBC Nightly News with Tom Yamas.

Good evening. I'm Laura Jarrett in for Tom, and a new system is on the move tonight,

threatening the West Coast after days of downpours.

It could bring fresh rounds of heavy rain, adding to scenes like these, roadways covered with

floodwaters, entire block submerged, rows of cars surrounded by water, firefighters carrying

...