[UPDATE BELOW] For those of you who somehow managed to miss that harrowing FLASH FLOOD emergency alert about an hour ago, it's raining very hard outside right now. This apocalyptic rainstorm is expected to last until later this afternoon, but it appears it's already too much for Penn Station, which just closed its main entrance at 7th Avenue thanks to flooding. Perhaps the rain will at least wash away the sewage?

Indeed, it appears Penn Station is having a tough week:

...Of course Penn Station is flooding. Of course. — Courtney (@vla13) May 5, 2017

#NJTransit says its 32nd and 7th #pennstation Entrance is closed cause heavy rain is flooding it and the stairway #njcommute — Larry Higgs (@CommutingLarry) May 5, 2017

Penn Station is a dump. Now it's ceiling can't even handle some rain. #NewYork #nyc — Garden State (@TVPilot2SaveNBC) May 5, 2017

The #NJTransit Penn Station entrance flooded.I am convinced that #NJTransit is just now sinking further and further down to hell. #alreadyis — SilkSpectr3 (@_SilkSpectr3) May 5, 2017

Penn Station isn't the only part of the city suffering in this rainstorm. Social media reports point to flooding all over town:

Serious flooding being reported on Manhattan's West Street near 23rd Street. Flash flood warnings in effect for the next few hours. — Steve Kastenbaum (@SKastenbaum) May 5, 2017

Dekalb station has the biggest flood of water coming into it’s station right now….so. — M a r c u s. (@_mtheophilus) May 5, 2017

DUMBO is underwater, RIP DUMBO.

Gowanus is also a goner:

What a shit show. I can't wait for all those luxury apartments to go in down here.#Gowanus #NYC pic.twitter.com/9o14T915eC — Leon Chase (@Leon__Chase) May 5, 2017

And though there don't appear to be any subway changes specific to the storm, there are delays on the A,C and E trains thanks to switch problems at Canal Street. Note that the subway stations themselves do not seem particularly floodproof:

Oh look, flooding. #rainraingoaway #subway #soaked #drenched #nyc #flashflood #mta #goingyourway A post shared by John Simpson (@simpsonjohnb) on May 5, 2017 at 10:17am PDT

It's raining on the u/t N/Q/R/W platform at Times Square. @NYCTSubway is dealing w/this by announcing that it may be slippery. pic.twitter.com/SoDrgNcYOK — (((Jeremy Posner))) (@jmp_nyc) May 5, 2017

The Flash Flood warning will last until 4:30 p.m., so please try to stay inside until then if possible.

Update 1:50 p.m.: The NYPD says 12th Avenue is flooded from West 23rd to West 34th Streets, and they've temporarily closed the stretch. Indeed, the flooding is real:

Update 2:15 p.m.: Things aren't looking pretty on Hamilton Avenue in Gowanus, where some bridge supports appear to have crumbled.

WATCH: Heavy damage causes holding the columns of the Goanus expwy in Brooklyn on Hamilton Ave by 17 St. pic.twitter.com/k16wmjSZiT — NYC Scanner (@NYScanner) May 5, 2017

De Blasio says stay dry!

A flood warning is in effect. If you can stay inside, stay inside. If not, please exercise caution. Stay dry and stay safe, NYC! https://t.co/5XOh9VUSEg — Bill de Blasio (@NYCMayor) May 5, 2017

Update 2:27 p.m.: The good news is, Madame Tussauds is safe.

There may be a flash flood in NYC but it's still a FIESTA here at @nycwax Happy Cinco De Mayo everyone! #NYCWAX #CincodeMayo #FamousFun pic.twitter.com/ldLVdnF6bf — Madame Tussauds NY (@nycwax) May 5, 2017

Update 2:36 p.m.: Scenes from Morningside Heights:

Meanwhile, it appears the very expensive, and quite new WTC Oculus is leaking:

The Oculus roof is leaking. It's raining INSIDE New York's $4 billion train station pic.twitter.com/rEntVCqcVY — Jen Wieczner (@jenwieczner) May 5, 2017

Not pictured in the last shot: the line of people currently trying to get OUT of the leaky Oculus. pic.twitter.com/IiHwz1pdW2 — Jen Wieczner (@jenwieczner) May 5, 2017

We contacted Port Authority for more information and will update if/when we hear back.

Update 2:48 p.m.: Now there's reportedly a manhole fire on 3rd Avenue and 42nd Street:

And potentially another one on 62nd and Broadway:

@ABC7NY @cnn 62nd and Broadway fire. Can you tell me what's going on? Looks like it's coming from the manhole. pic.twitter.com/STAaKZbR2E — Triple Plus (@5wig5wag) May 5, 2017

Update 3:20 p.m. Penn Station's main entrance is now open, but NJ Transit says flooding knocked out two of its tracks at 7th Avenue.

NYPenn tracks 7&8 out of service from 7th Ave Concourse due to flooding. Customers must use the 8th Ave Concourse. — NJ TRANSIT (@NJTRANSIT) May 5, 2017

The city Office of Emergency Management says to expect heavy traffic delays citywide thanks to flooding.

Meanwhile, it looks like the West Side Highway has reopened: