Another big Sept rain event between roughly midnight Friday morning and midnight Sunday morning (bulk 9/29-30/2023)

[Maureen]

  On 9/29/2023 at 4:41 PM, bluewave said:

 

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That gentleman took one step inside and said, “nope!”

[Intensewind002]

On and off showers out here, Up to about 1.44” now, 30+ dbz firehose is maybe like 6-8 miles to my west. Nassau and queens  looks to be taking the brunt of this now 

[Tatamy]

  On 9/29/2023 at 4:40 PM, EWRNJ said:

Maybe not. Strong band moving west into NJ. FFW just extended until 3 pm for Union City, NJ


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The flooding in the city is being caused by an inverted trough (IVT).  In this setup the winds are coming from different (opposing) directions on either side of the trough in the lower levels of the atmosphere.  The result is moisture present in the atmosphere is being forced to rise where the trough is setup resulting in the downpours that are being experienced.  These features are known for being prolific rain producers and as long as this one remains where it is the problems will continue.  

[Stormlover74]

 

 

[Gravity Wave]

Pouring here again. Visibility down to barely half a mile.

[LongBeachSurfFreak]

Great. Just started ripping on the uws again, who knows if I’ll ever get home.

[NJwx85]

A new area of intense rain is developing West of the city over Southern Bergen County.

As many have said, this is far from over.

[nycwinter]

  On 9/29/2023 at 4:51 PM, Tatamy said:

The flooding in the city is being caused by an inverted trough (IVT).  In this setup the winds are coming from different (opposing) directions on either side of the trough in the lower levels of the atmosphere.  The result is moisture present in the atmosphere is being forced to rise where the trough is setup resulting in the downpours that are being experienced.  These features are known for being prolific rain producers and as long as this one remains where it is the problems will continue.  

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is this the first time that a inverted trough actually produced for the city? they never seem to do...

[EWRNJ]

Looks like some echos showing up again over Jersey


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[donsutherland1]

Columbus Park (Mamaroneck, NY). The Sheldrake and Mamaroneck Rivers are over their banks. Streets and buildings are starting to flood.

[hudsonvalley21]

1.35” so far at 1pm.

[bluewave]

Flooding at New Rochelle High School.

 

 

[Neblizzard]

  On 9/29/2023 at 5:06 PM, EWRNJ said:

Looks like some echos showing up again over Jersey


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Areas  west of I-95 are the question mark 

[NJwx85]

  On 9/29/2023 at 5:06 PM, EWRNJ said:

Looks like some echos showing up again over Jersey


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Yup that is what I was referencing in my last post.

[psv88]

Breezy here and light rain. Very happy to escape the bad flooding. We don’t really flood around here anyway, but still good to avoid it. Good luck further west. 

[Jacob brooklyn]

  On 9/29/2023 at 4:49 PM, Maureen said:

My garage flooded, neighbors have some in their basements. 

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That's terrible anytime that happens. But at least someone who experienced a flooded basement. Sort of knows what to expect. And can take preventative measures somewhat. Versus a roof leak which is hard to predict

[Rtd208]

It does look like the rain is trying to expand back west of the Hudson River now so places in NE NJ may start to get back into some rainfall.

[donsutherland1]

  On 9/29/2023 at 4:47 PM, GaWx said:

-Note that all were between 7/3 and 10/1.

-9/1/2021: post Ida interacting with front

-9/4/1913: not directly from TC that moved W into SE US 9/3-4

-7/28/1913: frontal

-7/3/1930: offshore frontal low

-7/12/1937: frontal low

-10/1/1913: frontal low that moved offshore and later became H that hit SC 10/8

-8/10/2006: frontal

-8/21/2021: from nontropical event well ahead of Henri/not directly from it

-9/8/2004: post Frances interacting with front

-So, none directly from TC but some indirect or post TC

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Below is the distribution of all 1" or greater hourly amounts by month:

[winterwx21]

  On 9/29/2023 at 5:18 PM, Rtd208 said:

It does look like the rain is trying to expand back west of the Hudson River now so places in NE NJ may start to get back into some rainfall.

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Yeah for NE NJ, but our area is probably done. HRRR keeps it well north and east of Middlesex County now. We were fortunate to avoid the very heavy stuff. 

[Allsnow]

  On 9/29/2023 at 5:18 PM, Rtd208 said:

It does look like the rain is trying to expand back west of the Hudson River now so places in NE NJ may start to get back into some rainfall.

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Looks to be dying out mostly…

[NJwx85]

  On 9/29/2023 at 5:23 PM, Allsnow said:

Looks to be dying out mostly…

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It's not. Rain is intensifying near Paramus and filling in.

[jm1220]

The main firehose band looks to be pivoting east very slowly. Nassau might be screwed pretty soon and my area needs to keep an eye on it too. Already 3-5” in western Nassau. 

[Brian5671]

  On 9/29/2023 at 5:25 PM, jm1220 said:

The main firehose band looks to be pivoting east very slowly. Nassau might be screwed pretty soon and my area needs to keep an eye on it too. Already 3-5” in western Nassau. 

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yeah I am starting to get into it here-rain has picked up but so far it's been manageable with a steady moderate rain

[Tatamy]

  On 9/29/2023 at 5:06 PM, nycwinter said:

is this the first time that a inverted trough actually produced for the city? they never seem to do...

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No there are other instances where IVT’s have produced in the city.

[Allsnow]

  On 9/29/2023 at 5:24 PM, NJwx85 said:

It's not. Rain is intensifying near Paramus and filling in.

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  On 9/29/2023 at 5:25 PM, jm1220 said:

The main firehose band looks to be pivoting east very slowly. Nassau might be screwed pretty soon and my area needs to keep an eye on it too. Already 3-5” in western Nassau. 

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[bluewave]

Wettest September day on record at JFK.

 

 

[jm1220]

You can see on the radar how this setup works-the smaller cells firing up over the ocean and heading NW, then exploding into the firehose when they reach the inverted trough. 

[LongBeachSurfFreak]

The jfk area is going to end up the jackpot. Not that you really want to be in this type of situation. Luckily for me I live on the first floor of a house in lynbrook, the basement which is almost the same size as my apartment was also available at the time for half what I pay, I looked at it, and thought, yeah no floods. Having lived in Long Beach during my 20s that’s an important lesson. 

[uofmiami]

I can't get twitter links to post all of a sudden.  Anyway:

 

Flash Flood Warning continues for Brooklyn NY, Queens NY and Hempstead NY until 2:45 PM EDT

[Tatamy]

  On 9/29/2023 at 5:30 PM, jm1220 said:

You can see on the radar how this setup works-the smaller cells firing up over the ocean and heading NW, then exploding into the firehose when they reach the inverted trough. 

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You can also see the flow from the SW into the trough from central NJ.  Very interesting event that is unfolding here.