UPDATED 02/02/11 11:44 a.m.

CHICAGO (CBS) — The massive winter storm that slammed Chicago is now one for the record books–topped only by the blizzards of 1967 and 1999.

Here is what you need to know:

The Forecast: So far about 20.2 inches has fallen officially at O’Hare Many roads are impassable and officials are warning people to say home if possible. Read more about it here.

Worst Snowstorms: Where will this storm rank? So far, it’s No. 3. Click here for the 10 worst snowfalls in Chicago history. And here is a look at three of the worst past blizzards.

Survival Tips You need to take this seriously. Sure, this is Chicago, and we are weather-hardened, but check out this common-sense approach to staying safe.

Traffic Delays: Click here for the latest conditions on the area’s roads.

School Closings: Click here for the latest school closings. For the second day in a row, the Chicago Public Schools system will be closed Thursday

Other Closings and Cancellations: From government offices to museums, several Chicago institutions have decided to close for the blizzard, and a few events are canceled. Click here for a list.

Flight Delays: Both airports are essentially shut down. Check with your airline for the latest information.

Crisis On Lake Shore Drive: Hundreds of motorists were stranded on Lake Shore Drive during the blizzard, some for up to 12 hours. Here is what the city is saying about that, and what you need to do if you had to leave your car behind.

Plowing The Streets: The city is trying to keep the streets clear as the snow piles up. They will get to side streets after the main streets are all passable.

Lessons Learned: The blizzard of 1967 was the worst in Chicago’s history. The entire metropolis was caught off guard. At least that won’t happen this time. Click here to learn about the lessons learned since then.

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