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January: Medium/ Long Range: May the Force be with Us....


Weather Will
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9 minutes ago, mitchnick said:

18z Eps better than 12z believe it or not. It's not over at 144hrs either. 18z on top with 12z below.

sn10_acc-mean-imp.us_state_de_md.png

sn10_acc-mean-imp.us_state_de_md (1).png

Thats total snowfall, curious how much of that is increase in Friday event? 

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With blocking in place( Greenland and 50-50) the last five days before event usually sees a South trend unless Block is fading.

This only goes out 144. I’m assuming there is more after this
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8 minutes ago, mitchnick said:

Awww shucks...

 

3 minutes ago, NorthArlington101 said:

I checked the median and >3” & >6” percentage maps ready to deb but it’s a slightly better run across the board. Not an obvious south or dry shift. 

To get technical as I’m a couple drinks in, this is one more example that the EPS is appropriately dispersive whereas GEFS plays follow the leader at this range.

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Just to visualize what is holding our fate, it's that spaghetti ball spinning Northeast of Maine. It's the last 4 models runs. It's an absolute crapshoot with every model run. It'll be Sunday 0z before there's any true confidence.

trend-ecmwf_full-2024123118-f144.500hv.na.gif

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1 minute ago, mitchnick said:

Just to visualize what is holding our fate, it's that spaghetti ball spinning Northeast of Maine. It's the last 4 models runs. It's an absolute crapshoot with every model run. It'll be Sunday 0z before there's any true confidence.

trend-ecmwf_full-2024123118-f144.500hv.na.gif

Yeah I kinda have a feeling those of us on the northeastern edge aren’t gonna know until the last minute 

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1 minute ago, mitchnick said:

Just to visualize what is holding our fate, it's that spaghetti ball spinning Northeast of Maine. It's the last 4 models runs. It's an absolute crapshoot with every model run. It'll be Sunday 0z before there's any true confidence.

trend-ecmwf_full-2024123118-f144.500hv.na.gif

Chicken vs egg question.....is that gyre you noted strengthening the NAO block and location OR is the NAO dictating what that 50/50 does? Or is it a beautiful tango where they are both intertwined and dependent of one another?

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10 minutes ago, TSSN+ said:

Ok so basically nothing haha. Then ya that’s a good increase. 

Not true. Many places in the DC/MD & Southern PA jump into 1 shade higher. Plus, as I showed, there's more to come. Here's 24 hr totals that only include Monday event. 18z on top.

 

sn10_024h-mean-imp.us_ma (1).png

sn10_024h-mean-imp.us_ma (2).png

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Just now, mitchnick said:

Not true. Many places in the DC/MD & Southern PA jump into 1 shade higher. Plus, as I showed, there's more to come. Here's 24 hr totals that only include Monday event. 18z on top.

 

sn10_024h-mean-imp.us_ma (1).png

sn10_024h-mean-imp.us_ma (2).png

I was talking about the qpf from Friday is basically nothing so it wasn’t the reason for the increase. 

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17 minutes ago, Ralph Wiggum said:

Chicken vs egg question.....is that gyre you noted strengthening the NAO block and location OR is the NAO dictating what that 50/50 does? Or is it a beautiful tango where they are both intertwined and dependent of one another?

You'll have to ask them. I don't dance so well!

Honestly, I  don't know and neither do the models at this point.

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Ukie snowfall mean. Both 18z (top) and 12z (bottom) include Friday, which isn't much, but I put a link to the 18z Friday totals. My guess is snow is higher on 18z due to losing some northern outliers that had some rain, but that's a wag.

P.s. Ukie goes out to 198hrs, so that could explain higher totals than Eps, or it's timing issues.

https://www.pivotalweather.com/model.php?m=mogrepsgens&p=sn10_acc-mean-imp&rh=2024123118&fh=90&r=us_state_de_md&dpdt=&mc=&pwplus=1

sn10_acc-mean-imp.us_state_de_md (2).png

sn10_acc-mean-imp.us_state_de_md (3).png

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1 hour ago, Ralph Wiggum said:

Chicken vs egg question.....is that gyre you noted strengthening the NAO block and location OR is the NAO dictating what that 50/50 does? Or is it a beautiful tango where they are both intertwined and dependent of one another?

An atmospheric block involves both a ridge and a trough. The NAO block is typically a Rex configuration- the ridge up top and the trough/vortex to the south. Self sustaining once established.

eta- (technical) Energy in the atmosphere is carried in troughs(vorticity) so that drives the flow, and ridges form downstream( to conserve mass and absolute vorticity). Once the block is established, it takes energy(shortwaves) feeding into the trough to sustain it. One way our lovely NAO block will break down is if the upstream pattern shifts- the EPO ridge breaks down/TPV recedes, decreasing vorticity impulses in the flow moving into the trough component of the block.

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Just to visualize what is holding our fate, it's that spaghetti ball spinning Northeast of Maine. It's the last 4 models runs. It's an absolute crapshoot with every model run. It'll be Sunday 0z before there's any true confidence.
trend-ecmwf_full-2024123118-f144.500hv_na.gif.46506e974e03e1b6d0305a94c05cff64.gif

Hey Mitch, miss you over in the Philly forums. I like where we’re at this stage of the game. Long way to go, need the 50/50 to relax


.
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10 minutes ago, Heisy said:


Hey Mitch, miss you over in the Philly forums. I like where we’re at this stage of the game. Long way to go, need the 50/50 to relax


.

@Heisy

Are you still on Tom's site or somewhere else? I've checked the Philly forum here, but you never post there.

Does Tom's site still require an app?

Let me know! Thanks 

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2 hours ago, rjvanals said:

GFS shows a 1pm temp of 8 at DCA on the 11th I’ll take the over 

In the glory of days of yore we got powdery mid 20’s snow but then the backlash cold would pour in and say snow ended 11am at 25 and then windy, blowing snow temps falling rest of day to 15 by dark. 
Be nice to see one of those

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9 minutes ago, WEATHER53 said:

In the glory of days of yore we got powdery mid 20’s snow but then the backlash cold would pour in and say snow ended 11am at 25 and then windy, blowing snow temps falling rest of day to 15 by dark. 
Be nice to see one of those

Remember Alberta Clippers?  Good times. 

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12 minutes ago, WEATHER53 said:

In the glory of days of yore we got powdery mid 20’s snow but then the backlash cold would pour in and say snow ended 11am at 25 and then windy, blowing snow temps falling rest of day to 15 by dark. 
Be nice to see one of those

Was looking back through my notes and came up with 3/3/2014 as a nice 4-6”er with temps into the teens.  Great winter and sorely missed.

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