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4/17-18 snow threat


ORH_wxman
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  On 4/17/2020 at 9:37 PM, OceanStWx said:

That's likely their forecast over their whole domain area and they forgot to run it with intersite coordination (ISC) on that pulls in the surrounding office forecasts.

Oops.

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How the hell would you ever get to 1-2” for NYC on any domain area?

Even if you don’t pull from surrounding offices, what data would you load in to get those totals?

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  On 4/17/2020 at 9:44 PM, powderfreak said:

How the hell would you ever get to 1-2” for NYC on any domain area?

Even if you don’t pull from surrounding offices, what data would you load in to get those totals?

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Because that stuff happens outside of your CWA and sometimes even hidden behind ISC you may never notice. Technically I have the ability to forecast all the way to CAR, but I never look at what I'm forecasting up there because it doesn't get sent anywhere. UNLESS you create an image off your whole domain. 

So it could have been that they chose the coldest guidance for their area which affected NYC, or had too much QPF in an hour that had rain and snow at NYC, etc. 

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  On 4/17/2020 at 9:50 PM, OceanStWx said:

Because that stuff happens outside of your CWA and sometimes even hidden behind ISC you may never notice. Technically I have the ability to forecast all the way to CAR, but I never look at what I'm forecasting up there because it doesn't get sent anywhere. UNLESS you create an image off your whole domain. 

So it could have been that they chose the coldest guidance for their area which affected NYC, or had too much QPF in an hour that had rain and snow at NYC, etc. 

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Ahh gotcha.  So you manipulate the guidance for your local area and that might have some odd side effects elsewhere...but it doesn’t matter because no one will ever see it?  Interesting, I didn’t know it worked like that.  

I find it fascinating how you guys populate grids and make forecasts.

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  On 4/17/2020 at 9:53 PM, BombsAway1288 said:

Think BOX will bust with their 3"-4" for BOS.

I'll never criticize the NWS again if Logan reports over 3"

Not happening along the immediate coast

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If the goodies moved in from the south, they could. It's not temps vs as much as getting the intense lift. I am thinking 1-3 for the terminal. Probably 2ish.

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  On 4/17/2020 at 9:53 PM, powderfreak said:

Ahh gotcha.  So you manipulate the guidance for your local area and that might have some odd side effects elsewhere...but it doesn’t matter because no one will ever see it?  Interesting, I didn’t know it worked like that.  

I find it fascinating how you guys populate grids and make forecasts.

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Basically. Our products and web images all cut off a few miles outside our CWA borders, so it's no man's land beyond that. For instance we have a tool that pulls in CAR's snow forecast in case we have to make a statewide map. We don't want to accidentally pull in our own forecast for their area. Because sometimes we do disagree. ;)

  On 4/17/2020 at 9:53 PM, BombsAway1288 said:

Think BOX will bust with their 3"-4" for BOS.

I'll never criticize the NWS again if Logan reports over 3"

Not happening along the immediate coast

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  On 4/17/2020 at 9:55 PM, CoastalWx said:

If the goodies moved in from the south, they could. It's not temps vs as much as getting the intense lift. I am thinking 1-3 for the terminal. Probably 2ish.

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Yeah, if the lifts get in there it should be able to pound down 3 no problem. 

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Hey Scott, do you think the south trending models of the 12z and 18z runs are full of it and Cape Cod gets nothing, or do we cool enough for evaporation cooling and we get an all snow event.  Latest models show intense lift of -20 to -24 units of omega in the snow growth zone.  That lasts for a good four to six hours.

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  On 4/17/2020 at 10:24 PM, USCAPEWEATHERAF said:

Hey Scott, do you think the south trending models of the 12z and 18z runs are full of it and Cape Cod gets nothing, or do we cool enough for evaporation cooling and we get an all snow event.  Latest models show intense lift of -20 to -24 units of omega in the snow growth zone.  That lasts for a good four to six hours.

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Yeah you’ll flip to snow I think. You may flip back to rain after 5a or so, but I could see a thump as modeled. 

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