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March 7th 2018 Coastal Storm thread (not obs)


Rjay

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20 minutes ago, LongBeachSurfFreak said:

Just had a burst of huge parachutes it’s here!!!

It feels like we have two observation threads, both threads should be combined.

It switched to all snow here around 11:45 AM temp dropped 2 degrees and skies got really dark!

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3 minutes ago, jm1220 said:

Most recent HRRR I saw (15z) shows heavy snow starting around 2-3pm area wide, and snow continuing until maybe 10-11pm. About an inch liquid falls in the city/LI as snow. The peak could be a few inches per hour especially around 4-6pm. 

Looking forward to some 3"/hr rates and thundersnow, great afternoon snow should be perfect for photo ops!

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2 minutes ago, jm1220 said:

Most recent HRRR I saw (15z) shows heavy snow starting around 2-3pm area wide, and snow continuing until maybe 10-11pm. About an inch liquid falls in the city/LI as snow. The peak could be a few inches per hour especially around 4-6pm. 

It's continuing to show that wild looking 50 dbz convective CCB approaching Long Beach later.

rad7.thumb.gif.fb084796ca7f994f9dc27abe30529bad.gif

 

 

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13 minutes ago, nzucker said:

Discussing radar trends isn't banter.

Replying to the 1/27 reference, the cooling is dynamically driven so expect snow in heavier bands and rain in lighter bands. The 850s are plenty cold at -5C, but the surface is quite warm. That will be minimized as the higher rates move in.

1/27 also had a good bit of thundersnow, which we are expecting today. The convective look on radar is similar, although surface temps are probably a hair warmer due to time of year.

That one also occurred mainly at night.  But the difference in the time of year is a big deal regardless.  12/03 and 1/27/11 had quite a bit in common, this is a late season version of them.

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2 minutes ago, bluewave said:

It's continuing to show that wild looking 50 dbz convective CCB approaching Long Beach later.

rad7.thumb.gif.fb084796ca7f994f9dc27abe30529bad.gif

 

 

It's already all snow here and coming down hard- what rates are we looking at with that in SW Nassau?

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Just now, Paragon said:

It's already all snow here and coming down hard- what rates are we looking at with that in SW Nassau?

2-3"/hour. The radar looks crazy especially around dusk.

And the HRRR is showing lower amounts generally because it expects a couple of hours initially to be rain/snow, and the axis of heaviest precip shifted a little east. To me, everything's on track. 

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3 minutes ago, jm1220 said:

2-3"/hour. The radar looks crazy especially around dusk.

And the HRRR is showing lower amounts generally because it expects a couple of hours initially to be rain/snow, and the axis of heaviest precip shifted a little east. To me, everything's on track. 

Yep our only concern is getting all this to stick during prime heating hours but at those rates, it should do so easily.  I saw a crazy 12-18" prediction this morning dont know if that will verify though.

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9 minutes ago, Paragon said:

Yep our only concern is getting all this to stick during prime heating hours but at those rates, it should do so easily.  I saw a crazy 12-18" prediction this morning dont know if that will verify though.

I highly doubt that but 6" or so looks like a good bet, maybe 8". Have to expect 7 or 8-1 ratios. It'll paste like crazy to the trees/power lines, so outages may be going up pretty substantially later today. 

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6 minutes ago, jm1220 said:

I highly doubt that but 6" or so looks like a good bet, maybe 8". Have to expect 7 or 8-1 ratios. It'll paste like crazy to the trees/power lines, so outages may be going up pretty substantially later today. 

I see they're getting thundersnow in Manhattan, Queens, Staten Island and Brooklyn, I wonder when that gets here.  There's also thunder and lightning down the Jersey Shore.

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Hudson-Eastern Union-Eastern Essex-Western Bergen-Western
Union-Western Essex-Eastern Bergen-Eastern Passaic-Northern
Nassau-Kings (Brooklyn)-Northern Queens-Southern
Queens-Bronx-Southern Westchester-New York (Manhattan)-Richmond
(Staten Is.)-Southern Nassau-
1249 PM EST WED MAR 7 2018

...HEAVY SNOW DEVELOPING OVER HUDSON...UNION...BERGEN... EASTERN
ESSEX...SOUTHERN WESTCHESTER...QUEENS...RICHMOND...BRONX...
KINGS...NEW YORK (MANHATTAN) AND CENTRAL NASSAU COUNTIES...

At 1242 PM EST, Rain will change to heavy snow across the region
through 2pm. Isolated lightning strikes are expected.

Snowfall rates of 1 to 2 inches per hour are expected to develop
through mid to late afternoon. Visibilities will drop to one quarter
mile or less.
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1 hour ago, larrye said:

I dunno. Up here in Tarrytown, it's 34 degrees and not sticking. I would have expected an inch or two at least already based on the forecasts that I heard. But let's see if the column cools down and we see an accumulating snow this afternoon. Theoretically, with 2" per hour ... even if the accums start at 1PM, we could see 10"-12". You guys would know much better than I how to interpret the radar and whether it will fill in.

And just like I predicted it's currently puking snow here, accumulating at the rate of 2-3" per hour.

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NWS P&C for Harlem.

 

Snow. The snow could be heavy at times. Some thunder is also possible. High near 35. Wind chill values between 20 and 25. Breezy, with a north wind 18 to 21 mph, with gusts as high as 33 mph. Chance of precipitation is 100%. Total daytime snow accumulation of 9 to 13 inches possible.

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