March Madness! Spring Snowstorm Observations

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Post by Frank_Wx on Tue Mar 20, 2018 10:32 am

The 12z NAM just laid down the Godzilla hammer

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Post by Frank_Wx on Tue Mar 20, 2018 10:35 am

GODZILLA ON THE WAY!

NEW SNOW MAP AROUND 3PM

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Post by RJB8525 on Tue Mar 20, 2018 10:36 am

has the south and east trend begun for us north westerners?
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Post by jimv45 on Tue Mar 20, 2018 10:38 am

The Nam looks likes it backs in some nice precip into Thursday.

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Post by billg315 on Tue Mar 20, 2018 10:44 am

32* here with a dewpoint of 10*. Under this morning's thick cloud cover and with a chilly NE breeze the temperature has not risen a degree since 7 a.m. Unless that changes much in the next few hours, this storm should get going tonight with plenty of cold at the surface.
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Post by amugs on Tue Mar 20, 2018 10:45 am

aiannone wrote:
amugs wrote:Upton hinting at possible now dont blow teh roof here but possibly hoisting B warnings for LI and then redressing for NYC Metro. I know Goodman from Upton and he said they just are waiting for 12Z suite to finish - need a little more support but it is on the table for NYC Metro.

Woah so blizzard warnings should be issued within an hour or 2?

Alex, next update 12PM? Or they wait till Euro and 2PM?

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Post by crippo84 on Tue Mar 20, 2018 10:47 am

Correct me if I'm wrong but the NAM shows surface temps below freezing this time for the duration of the heaviest precip no? Are we still thinking 8:1 ratios and very wet snow again?
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Post by CPcantmeasuresnow on Tue Mar 20, 2018 10:47 am

billg315 wrote:32* here with a dewpoint of 10*.  Under this morning's thick cloud cover and with a chilly NE breeze the temperature has not risen a degree since 7 a.m. Unless that changes much in the next few hours, this storm should get going tonight with plenty of cold at the surface.

25 here Bill. Lots of cold air to filter down to you tomorrow and help you out. It's what we do in the HV.
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Post by amugs on Tue Mar 20, 2018 10:49 am

Peeps just look at all the latent heat in teh gulf states with the tornados and severe weather t-storm etc. This going to be a beast. Whenever you see this there are tremendous dynamics at play that models will under do. Not saying more than what NWS has put up but the possibility of over performing is on teh table from this observation.

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Post by billg315 on Tue Mar 20, 2018 10:51 am

CPcantmeasuresnow wrote:
billg315 wrote:32* here with a dewpoint of 10*.  Under this morning's thick cloud cover and with a chilly NE breeze the temperature has not risen a degree since 7 a.m. Unless that changes much in the next few hours, this storm should get going tonight with plenty of cold at the surface.

25 here Bill. Lots of cold air to filter down to you tomorrow and help you out. It's what we do in the HV.

Much appreciated. You send the cold air down here tonight and tomorrow and I'll ship the heavy precip bands up your way during the day tomorrow after I'm done with them here.
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Post by billg315 on Tue Mar 20, 2018 10:59 am

Currently moderate rain in South Jersey. Light snow in Philadelphia. Be interesting to see how far north that makes it during the day today. Seems to be making progress aloft, but the air is so dry over me now (32* temp/10* dewpoint) that I don't expect anything much to reach the ground in the next few hours.
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Post by Frank_Wx on Tue Mar 20, 2018 11:00 am

12z RGEM is Madonne. Note I am showing this in 2 hour increments.

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Post by dsix85 on Tue Mar 20, 2018 11:05 am

Frank- you anticipate blizzard warnings to go up in some areas?

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Post by aiannone on Tue Mar 20, 2018 11:08 am

Frank, correct me if I'm wrong, but it seems the significant sleet threat for the coast has been basically eliminated or at most reduced to a brief period at the onset.
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Post by Guest on Tue Mar 20, 2018 11:08 am

The RGEM and the NAM show 12-18” for many on our forum on March 21st. Incredible

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Post by Quietace on Tue Mar 20, 2018 11:14 am

aiannone wrote:Frank, correct me if I'm wrong, but it seems the significant sleet threat for the coast has been basically eliminated or at most reduced to a brief period at the onset.
For LI yes, some parts of JS, especially further south may have potential mixing until mid-day. This would be specific for extreme coastal areas. Check the skew-t's off of the 3km NAM for verification. There seems to be a warm nose in the mid-layers (approx 850 or so) for a bit. I would side for more sleet than a liquid p-type, though it would cut down on totals.

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Post by Quietace on Tue Mar 20, 2018 11:19 am

Quietace wrote:
aiannone wrote:Frank, correct me if I'm wrong, but it seems the significant sleet threat for the coast has been basically eliminated or at most reduced to a brief period at the onset.
For LI yes, some parts of JS, especially further south may have potential mixing until mid-day. This would be specific for extreme coastal areas.  Check the skew-t's off of the 3km NAM for verification. There seems to be a warm nose in the mid-layers (approx 850 or so) for a bit. I would side for more sleet than a liquid p-type, though it would cut down on totals.
This is gone though by 18z or earlier but 850s are rather borderline until after that. Such that the amount of snow lost is equivalent to the length of time that sticks around. I would bet on the shorter rather than the longer given the track of the mid-level lows even with the strong WAA out of the east. Surface temps along the coast have to be watched during this time as well, though I am less inclined to worry this time around given the rates.

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Post by Sanchize06 on Tue Mar 20, 2018 11:37 am

12z GFS coming in west of 6z, should be a huge hit like 0z was

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Post by aiannone on Tue Mar 20, 2018 11:41 am

Only issue with 12z GFS is it's slightly warmer than 0z
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Post by aiannone on Tue Mar 20, 2018 11:48 am

Crapola and Regular
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March Madness! Spring Snowstorm Observations - Page 3 Captur76
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Post by Sanchize06 on Tue Mar 20, 2018 11:49 am

March Madness! Spring Snowstorm Observations - Page 3 Sn10_acc.us_ne

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Post by mmanisca on Tue Mar 20, 2018 11:53 am

Agreed. I don't like those 850 temperatures.
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Post by Frank_Wx on Tue Mar 20, 2018 11:55 am

dsix85 wrote:Frank- you anticipate blizzard warnings to go up in some areas?

Yes, NYC Metro, eastern NJ and LI

aiannone wrote:Frank, correct me if I'm wrong, but it seems the significant sleet threat for the coast has been basically eliminated or at most reduced to a brief period at the onset.

Correct and...

Quietace wrote:
aiannone wrote:Frank, correct me if I'm wrong, but it seems the significant sleet threat for the coast has been basically eliminated or at most reduced to a brief period at the onset.
For LI yes, some parts of JS, especially further south may have potential mixing until mid-day. This would be specific for extreme coastal areas.  Check the skew-t's off of the 3km NAM for verification. There seems to be a warm nose in the mid-layers (approx 850 or so) for a bit. I would side for more sleet than a liquid p-type, though it would cut down on totals.

...this is the reason why

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Post by Frank_Wx on Tue Mar 20, 2018 11:55 am

12z CMC is unbelievable

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Post by Frank_Wx on Tue Mar 20, 2018 11:56 am

GFS

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