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October 2019 General Discussions & Observations Thread


Rtd208
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30 minutes ago, binbisso said:

It's very unlikely we'll get snow late October or early November however that is a fantastic look on the EPS GEFS and the euro weeklies heading into November. What really stands out to me is the negative Nao on all guidance. Now we just have to wait and see if it really happens

The NAO has actually been negative much of the month so far. But the Niña-like Pacific has dominated the pattern.

6BA66C30-6492-4564-8D0C-A8E70E1D963B.gif.98c6f863cb0bb23b490c9d2ec8a8df99.gif

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Will be interesting to watch PTC 17 in the EPAC the next 24-48 hours - it's part of that Central American gyre some have noted recently. Most overnight guidance allows it to redevelop across the Bay of Campeche quickly, enough for it to become a tropical storm on some guidance as it approaches the US Gulf Coast. 00Z EPS tracks below:

101619_00Z.thumb.png.12046270c7e2b88008034aee2fdc1b42.png

This system may ruin our chances at 80-degree weather early next week as it gets caught up in the southwesterly flow ahead of our next big frontal passage, centered on next ~Tuesday. On the flip side it could also help wipe out our recent rainfall deficit.

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It’s odd to see such a rapidly depending storm forecasted and very unimpressive winds forecasted.  Storm forecasted just to our NE in the 970s and little wind.   
It's pretty much tropical storm force winds to areas closest to the low in New England. That's about right for 970s.

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4 minutes ago, qg_omega said:

It’s odd to see such a rapidly depending storm forecasted and very unimpressive winds forecasted.  Storm forecasted just to our NE in the 970s and little wind.   

From what I get from some of the Mets, there’s a lag between deepening and winds. This thing is moving too fast for us to maximize winds. Also the majority of the area is on the weaker side of the storm. 
There will be plenty of wind tomorrow though region wide with a prolonged period of west winds with gusts in the 40s

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6 minutes ago, qg_omega said:

It’s odd to see such a rapidly depending storm forecasted and very unimpressive winds forecasted.  Storm forecasted just to our NE in the 970s and little wind.   

Wherever convection is at play on LI will have some 50KT gust potential. It would be unusual not to see gusts like this with the low-level winds forecast (~950-925mb) and a rapidly deepening low in the area. I suspect most stations in the area will have G40-45KT after midnight and again tomorrow as the cold air moves in.

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Most of the time we get stronger winds here on the backside of a storm as the pressure rises. Think we're in for a similar outcome here. 

Anyway the wind field on the 3k NAM looks more like a tropical system than a purely cold core system with the strongest winds just to the North and East of the center.

nam3km_mslp_wind_neus_26.png

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41 minutes ago, SnoSki14 said:

Really impressive system regardless of what happens.

The HRRR has the secondary going from around 1000mbs to 975mb in less than 12 hrs, that's bombogenesis in half the time required. 

The low pressure would also set records in New England for October.

The low pressure record for Cape Cod is only 2 years old with storm in late October 2017. New low pressure records for October around the region were set in 2006, 2012, and 2017. Just goes to show how extreme our weather patterns have become.

B9598450-98C7-4BFB-91C6-3BAADE5E2013.thumb.gif.11da9ca61906b0250d1f4451308477c1.gif

 

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3 minutes ago, bluewave said:

The low pressure record for Cape Cod is only 2 years old with storm in late October 2017. New low pressure records for October around the region were set in 2006, 2012, and 2017. Just goes to show how extreme our weather patterns have become.

nice! the "octobomb" storm back in 2010 really stands out over the middle of the country, as well.

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The mountains do tricky things to the pressure field, but the dominant low appears to be taking shape on the lee side trof over central NC as of 15Z. Pressure falls are increasing over the Mid-Atlantic, which is exactly where this low will end up tracking later today.

15Z_sfc.thumb.png.6e1a942c77157f5615397dd064ac6ac6.png

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