The two questions theatergoers want answered (after: How bad will it be?) are:

Will the shows be canceled?

Will there be a snow day discount?

If you cannot make it to a show, you should contact your point of purchase in advance. (You can go to Telecharge, for example, to see if your show is offering advance exchanges.)

As for snow day discounts — Look on Twitter; check out the Twitter feed of your favorite show(s). They are unlikely to advertise their snow day discounts on their websites.

—-

March 5, 2015 updates:

A winter storm warning remains in effects and encompasses all five boroughs of New York City, as well as Nassau and Suffolk counties and central and southern New Jersey, with snow accumulation predicted of 6 to 8 inches.

No cancellations are planned.

#Snowday Discounts:

It's a #BwaySnowDay! Use code OTTSD1 at the Lyric box office to claim $32 tickets to tonight's show! pic.twitter.com/I0hw1Ru2O3

— On The Town (@OnTheTownNYC) March 5, 2015

Mamma Mia is also offering a snow day discount: Orchestra seats are available for $63, and some seats are discounted to $33.

Here’s a more typical unofficial #Snowday discount:

Need a ticket to @bklynitemusical tonight? We got rush at 6. A bunch of cancellations due to snow. Seize the moment and come see The Supers!

— Gerard Canonico (@Gerardcanonico) March 5, 2015

Snow=Ice – Bucks MT @BAM_Brooklyn
Limited #BAMrush tix (students & seniors) available to tonight's #IcemanCometh! Bring your ID!

— New York Theater (@NewYorkTheater) March 5, 2015

Update 3 p.m.

Interesting message on MTC website:

“Regardless of weather, MTC’s performances will continue as scheduled.  The performers and crew are making extraordinary efforts to travel to New York City Center / Samuel J. Friedman Theatre, and we encourage you to make every effort to attend.”

The following shows are offering ADVANCE EXCHANGES (before the performance) for Telecharge customers who are unable to attend a performance on Thursday, March 5, due to the winter storm:
Application Pending
The Audience
Avenue Q
Beautiful: The Carole King Musical
The Book of Mormon
Chicago
Churchill (mat and eve)
Constellations*
The Curious Incident of the Dog…
Fish in the Dark
Fuerza Bruta
A Gentleman’s Guide to Love and Murder
Hedwig and the Angry Inch
The Heidi Chronicles
It’s Only a Play
Jersey Boys
Kinky Boots
LES MISERABLES
Mamma Mia!
Matilda
Nevermore (mat and eve)
The Phantom of the Opera (mat and eve)

*Due to limited availability, Constellations will only allow ADVANCE REFUNDS for tonight’s performance. You will not be able to exchange into another performance. If you did not purchase your tickets from Telecharge, please contact your original point of purchase.

—–

(January 25 to January 27:)

The three Broadway shows that normally have performances on Monday were canceled, because of the government-ordered shut-down of the roads and public transportation.

Now the question is: What will happen today (Tuesday)?

Update 1:30 pm.: Several Off-Broadway theaters still have canceled performances for tonight: Atlantic Theater, Classic Stage Company, York Theatre, 59E59.

Update noon
The #snowday discounts are beginning

Update 10:30 a.m

From the Broadway League:

Most shows will perform evening performances tonight, Tuesday, January 27, as scheduled, with the exception of Disney’s Aladdin and The Lion King. Theatregoers should check official show websites to confirm that their specific show is playing.

Remember: If you cannot make it to a show, you should contact your point of purchase in advance. (You can go to Telecharge, for example, to see if your show is offering advance exchanges.)

Update 10 a.m. Tuesday January 27, 2015: The forecast of a “crippling” snowstorm turned out to be inaccurate, at least for New York City where there are from four to eight inches of snow. The ban on travel was lifted at 7:30 a.m., subway service resumed (on a limited Sunday schedule) at 9 a.m. with full service expected by noon.

Although some shows (Aladdin and The Lion King) announced cancellations before the storm hit, it seems unlikely that there will be many more show cancellations — and more likely there will be snow day discounts. Stay tuned for updates.

1:20 a.m. Tuesday January 27, 2015 Times Square:

Update 10:30 p.m Monday January 26, 2015 Times Square looking South. (not much of a snowstorm in Manhattan yet)

Update Monday 10 p.m. Disney Theatrical Productions also canceled scheduled performances of Aladdin and The Lion King for Tuesday, January 27 

Update Monday 3 p.m.:

“As a result of the travel restrictions put in place by government authorities and additional safety precautions implemented due to severe weather, all Broadway performances tonight will be cancelled.” – The Broadway League

That means cancelation of the three shows scheduled for tonight – Chicago, Mamma Mia and The Phantom of the Opera. (All other Broadway shows are normally dark on Mondays.)

The MTA will switch to limited service after 7 p.m., with bus service basically shutting down.

There is a curfew on all but emergency vehicles starting at 11 p.m.

Update 1 p.m. Monday

While Broadway shows are vowing to go on, other shows have already canceled tonight. David Kenney at the Metropolitan Room has been rescheduled for February 12th.  #BroadwayUnplugged at Town Hall has been rescheduled for July 20..

Update 10:30 a.m. Monday

“As of now, all Broadway shows are playing as scheduled.” – The Broadway League

There are very few Broadway shows with performances on Mondays. Three that do expect that the show will go on: Chicago at the Ambassador, Mamma Mia at the Broadhurst, The Phantom of the Opera at the Majestic.

Here is the normal weekly schedule:

Update 8 a.m. Monday, January 26:

“This could be the biggest snowstorm in the history of New York City so, yes, there could be delays of everything,” Mayor Bill de Blasio told reporters. (New York Braces for Blizzard Amid Warnings of Closings and Hazards.)

1888: 21 inches

1947: 26 inches

2006: 26.9 inches

2015: 30+ inches expected

Sunday, January 25

A  “Blizzard Warning” has been issued by the National Weather Service for a “crippling and potentially historic” storm in New York City and much of the Northeast predicted for Monday afternoon, January 26  through Tuesday evening, January 27 2015, with gusts of wind up to 50 miles per hour.

In general, it is rare that the Broadway League will announce the cancellation of a show. It did not happen in all of 2014 despite several severe snowstorms. But if you cannot make it to a show, you should contact your point of purchase  in advance. (You can go to Telecharge, for example, to see if your show is offering advance exchanges.)

As for snow day discounts — Look on Twitter; check out the Twitter feed of your favorite show(s). They are unlikely to advertise their snow day discounts on their website.

As of Sunday night at 9 p.m.: The weather service is predicting for Monday starting as early as 1 p.m. “snow accumulation of 20 to 30 inches, with locally higher amounts possible. Snowfall rates of 2 to 4 inches per hour expected late Monday night into Tuesday morning.”

Come back to this post for updates.

Normal Broadway schedule:

https://twitter.com/lopezbobby/status/559534241956917249

From the National Weather Service: