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December 17-19, 2023 | NE / Mid-Atlantic Storm


Penn State

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13 hours ago, StretchCT said:

1 is a weird possibly tropical surface low.  3 will drop into 2. Those combined (what is circled above) may or may not  wrap in 1. 

 gfs_z500_vort_namer_14.thumb.png.3c356263c481907594923637c90eb0dc.png

For reference 1,2,3,4 outlined above, remember 4 isn't here yet at that time frame but is the trough over Canada that yesterday looked pretty flat.

12z GFS comes in a little different.

2 eats up 1 over the SE.  3 doesn't drop in as quickly but still does. There's a new player between 3 and 4 on the field that doesn't seem to do any steering but provides a little more energy. 4 makes a last minute decision to join the party and extends an arm to the now combined 123.

floop-gfs-2023121312.500hv.conus.thumb.gif.946e5bc6ad471e312737123184f52c09.gif

 

Paying attention to 4, these two frames differ quite dramatically

trend-gfs-2023121312-f138.500hv.conus.gif.b91bcbec2e70560debddd0fb8e0b38b6.gif

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Pangu

image.thumb.png.9540b6f3af028420b76f402832c3bf74.png

Trend

Screenshot2023-12-13at12_15_45PM.thumb.png.55a7a5878890f4b81c8b653098d87bf4.png

 

My question to the teams developing these models is if they claim they are accurate, why is there such variation run to run?  Which run is the accurate one? Pangu right now has the most variation for hr 132, with the system going from the GOM this past Sunday's forecast, to off the SE coast on Mondays forecasts and to west of Philly today. 

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22 hours ago, bigben89 said:

It's not going to happen. We never got snow on December 18th or 19th, ever. I'm fully expecting 60 degrees and sunshine. Hell, I might mow the lawn or get the golf clubs out.

So follow this advice and you can go golfing while your lawn mows itself.

 

 

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1 hour ago, StretchCT said:

For reference 1,2,3,4 outlined above, remember 4 isn't here yet at that time frame but is the trough over Canada that yesterday looked pretty flat.

12z GFS comes in a little different.

2 eats up 1 over the SE.  3 doesn't drop in as quickly but still does. There's a new player between 3 and 4 on the field that doesn't seem to do any steering but provides a little more energy. 4 makes a last minute decision to join the party and extends an arm to the now combined 123.

floop-gfs-2023121312.500hv.conus.thumb.gif.946e5bc6ad471e312737123184f52c09.gif

 

Paying attention to 4, these two frames differ quite dramatically

trend-gfs-2023121312-f138.500hv.conus.gif.b91bcbec2e70560debddd0fb8e0b38b6.gif

.

 

The white whale holy grail of them all....the quadruple phaser....

And we now turn to Ollie Williams for the black-u-weather forecast....Ollie?

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  • The title was changed to December 16-20, 2023 | NE / Mid-Atlantic Storm Potential
7 minutes ago, bigben89 said:

Bernie Rayno on board with a storm up the coast. All rain, hardly any mention of snow.

Stamp it!

Is it the wind shield wiper effect when its rain... 🙂

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Other than it being too far west for most, this is how you get your big storm.  Surprised it's not deeper though.

floop-ecmwf_full-2023121312.500hv.conus.gif.60990f747175943fe99d23bb74785af6.gif

Well it does go to 982, but that's before the cold air even gets here.  Wondering how to get a situation where the energy/moisture doesn't escape to the NE so rapidly.  

image.thumb.png.974550c2bacb39d47d670e0ba6882a40.png

 

With temps ahead of the storm in NYC at 66°, no chance of a cold air damming situation.

image.thumb.png.59c23107d1515e6a84bd10775166081c.png

 

Edited by StretchCT
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32 minutes ago, StretchCT said:

Other than it being too far west for most, this is how you get your big storm.  Surprised it's not deeper though.

floop-ecmwf_full-2023121312.500hv.conus.gif.60990f747175943fe99d23bb74785af6.gif

Well it does go to 982, but that's before the cold air even gets here.  Wondering how to get a situation where the energy/moisture doesn't escape to the NE so rapidly.  

image.thumb.png.974550c2bacb39d47d670e0ba6882a40.png

 

With temps ahead of the storm in NYC at 66°, no chance of a cold air damming situation.

image.thumb.png.59c23107d1515e6a84bd10775166081c.png

 

Good point. Very well may get stronger as well as setup deform bands. Long way to go. I'll bet she'll rip in cold air as shes leaving, or sits and spins. 

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4 hours ago, LUCC said:

Can't win, warm and wet, global warming. Cold and dry, global warming. 👀

I hate global warming. We go from 3 La Niñas in a row ( warm winters last 2 ) and now to a strong El Niño and possibly warm. We can’t win . Why couldn’t it have stopped in the middle this year and been neutral 

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Its the icon but even its doing some crazy 500mb swings from the 12z to 18z run.. way more interaction with the northern stream. At least there are pretty 500s to track. Still some time on this one. 

Edited by WeatherFlash
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40 minutes ago, JDClapper said:

Well, fwiw, 12z EPS has more members entertaining some white in interior PA than the past several days. /shrugs

 

Screenshot_20231213-154241_Chrome.jpg

Was just about to post for my area. Big jump.  

image.png.fd7a5bcdce1cd9d3551256b66f91f678.png

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