" data-check-event-based-preview="" data-network-id="" data-details="">

Massive shelf cloud darkens sky over downtown Chicago

A massive shelf cloud formed over downtown Chicago as the area faces severe storm threats. Over 85 million Americans living between Michigan to Texas are currently at risk of dangerous weather. CNN's Derek van Dam reports.

01:10 - Source: CNN

Wicked weather 16 videos

" data-check-event-based-preview="" data-network-id="" data-details="">
chicago shelf cloud

Massive shelf cloud darkens sky over downtown Chicago

01:10

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
elam vpx screengrab

'Unbelievable': CNN reporter reacts to record snowfall in California

01:53

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
mississippi destruction

Hear how tornado lifted couple up in the air while sitting in their bathtub

02:41

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
01 Montebello storm damage 0322

Watch: Rare tornado tosses debris near Los Angeles

01:04

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
Video thumbnail Ed Hawkins warming stripes

Graphic shows all the changes in global temperature since 1850

03:28

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
03 CA Snow

Man builds 12-foot-tall snow tunnel to get out of home

00:45

Now playing

- Source: CNN

california flooding vpx

Drone video captures the aftermath of deadly California atmospheric river

02:03

Now playing

- Source: CNN

fedex delivery driver falling tree kentucky

Watch dangerous moment FedEx driver encounters on route

00:41

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
storm chaser

'Early wake-up call': Storm chaser describes severe storms in central US

02:33

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
wyoming state trooper dodges truck

Dashcam shows speeding semitruck inches from striking state trooper

01:59

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
exp nasa weather transformer chinchar 022109ASEG2 cnni business_00003828.png

NASA studies earth dust from space

03:32

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
Mt Wash observ orig thumb

Watch Mt. Washington endure historic wind chill of -108°F

01:09

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
Auckland flooding

Record rainfall hits New Zealand's largest city. See what it did to the airport

01:02

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
CA flood rescue orig 2

Video: California woman rescued from rushing waters by helicopter

00:58

Now playing

- Source: CNN

" data-check-event-based-preview="" data-network-id="" data-details="">
alabama tornado vpx

Fast-moving, powerful storms moving through the Southeast

01:29

Now playing

- Source: CNN

bernal 99 highway california flooding vpx

Stunning aerial footage shows California highway underwater

01:38

Now playing

- Source: CNN