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New York Today: Extreme Drop

Not this again.Timothy Clary/Agence France-Presse â€" Getty Images Not this again.

Good Thursday morning. It’s very cold.

And windy.

We can’t even call this a weather roller coaster.

It’s more like a bungee jump.

On Wednesday afternoon, the temperature was 56 degrees.

This morning, it’s 21 degrees.

Luckily, like a bungee, the temperature will reach its nadir today, snap and bounce up again by Friday.

But not all the way â€" only to the low 40s.

For now, the air that you feel is coming straight from the Canadian snowpack.

So we’ll have unceasing cold, with wind chill factors in the single digits.

Icy patches, where puddles formed.

Grimacing faces, if left uncovered.

In other words, the same old routine.

Only worse: The wind will blow all day, with gusts occasionally reaching 45 miles an hour.

It’s usually much warmer on March 13; the average high is 49 degrees.

But buck up.

On this day in 1888, it was 6 degrees.

Here’s what else you need to know:

COMMUTE

Subways: Check latest status.

Rails: Check L.I.R.R., Metro-North or N.J. Transit status.

Roads: Check traffic map or radio report on the 1s or the 8s.

Alternate-side parking is in effect.

COMING UP TODAY

- Mayor de Blasio gives an update on Wednesday’s building collapse in East Harlem. City Hall. 11:45 a.m.

- One year since white smoke. Cardinal Dolan signifies the naming of the new pope at St. Patrick’s Cathedral. 7 a.m. [Free, with livestream]

- Happy International Tourist Guide Day. Guides are offering free tours of city staples; a few indoors. [Reservations required]

- Housing advocates hold a mock trial to critique Brooklyn Housing Court. Brooklyn Borough Hall. 6 p.m.

- The National Book Critics Circle Awards Ceremony is free at the New School. Here are the finalists. 6 p.m. [Free, $75 for the after party]

- Uh-oh. A panel on how artificial intelligence could automatically produce news stories based on data, at Columbia Journalism School. 6:30 p.m. [Free, with livestream]

- Ask a stranger anything. “Ask Roulette” returns to Housing Works in SoHo. 7 p.m. [Free, R.S.V.P]

- “How to make eggs in space,” a talk with an astronaut and a space nutritionist, at the New York Academy of Sciences in the financial district. 6:30 p.m. [$25]

- Beat rhyme battle time. The four-day American Human Beatbox Festival opens with an open-mike night on the Lower East Side. 10 p.m. [$15]

- “Rocky,” the musical, opens on Broadway. It opens to the general public Friday. [$59 and up]

- For more events, see The New York Times Arts & Entertainment guide.

IN THE NEWS

- At least six people died in a building collapse, attributed to a gas leak, in East Harlem. [New York Times]

- Residents of the area recounted what it was like to be there. [New York Times]

- A study of 4,000 children aims to discover what makes prekindergarten successful. [New York Times]

Joseph Burgess contributed reporting.

New York Today is a weekday roundup that stays live from 6 a.m. till late morning. You can receive it via email.

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