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October 2019 General Discussions & Observations Thread


Rtd208
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2 minutes ago, Tatamy said:

Radars in central PA looking fairly impressive at this time with the squall line now passing to the east of the Harrisburg area.  Ground obs are indicating that the strongest winds are remaining aloft however.  Wind gusts in that area have maxed out in the 30 to 40 mph range so far.  

Winds at 850 mb are supposed to dramatically increase over the next few hours (HRRR shows 850 winds briefly topping 90 mph) but at the same time convection will decrease as it moves into this general area. We'll see if we can mix down any significant winds here as we tend to do well with southerly winds. 

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KOKX AFD Updated at 8:33pm:

NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
Severe thunderstorm watch 691 is in effect until 1 am for NE NJ and 
the Lower Hudson Valley. A low topped line of convection is 
approaching along the strong cold front across upstate NY and 
eastern PA. The line of convection should enter northern NJ and the 
Lower Hudson Valley 02-04z and then quickly move east towards the 
Hudson River Corridor. Instability is marginal, but strong low-level 
flow and shear may help bring down severe wind gusts in the low 
topped convection. It is entirely possible that no lightning is 
observed when this line moves through. 

High resolution models indicate the line weakens as it approaches 
the NYC metro and then the remnants of the line race across Long 
Island and southern Connecticut. The strong low level jet, 65-75 kt 
at 925 mb will cross eastern portions of the area this evening and 
into the overnight. Despite the weakening of the convection, these 
strong winds just above the surface may come down with turbulent 
mixing with the frontal passage 06 to 08z east of the city. It may 
be difficult to mix some of the higher winds above the surface down 
initially with inversion observed on the 00z OKX sounding. However, 
gusts gradually increase this evening as winds at the top of the 
mixed layer are around 50 kt. Could still see gusts over 45 mph 
before the actual front and stronger momentum arrives. Wind 
headlines have not changed since previous forecast. Strongest winds 
still appear likely across eastern Long Island and southeast 
Connecticut where the high wind warning remains in effect. 

Locally heavy rainfall is possible, but the best chance of seeing 
this is likely across the Lower Hudson Valley and NE NJ, with 
weakening of the line of showers thereafter. Rainfall amounts are 
likely to drop off significantly across Long Island and southern 
Connecticut. 

Temperatures in the mid to upper 60s with some low 70s possible 
ahead of the front. Temperatures will drop rapidly behind the front 
and could be in the 40s west of NYC and low 50s east by
daybreak. 
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31 minutes ago, Tatamy said:

Radars in central PA looking fairly impressive at this time with the squall line now passing to the east of the Harrisburg area.  Ground obs are indicating that the strongest winds are remaining aloft however.  Wind gusts in that area have maxed out in the 30 to 40 mph range so far.  

Models are pretty unanimous that it falls apart as it moves through NJ. That would limit what strong winds can mix down. There may be some 50mph gusts but not the same as if we had the full squall line coming through. 

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5 minutes ago, Rjay said:

Getting some good gusts.  JFK gusting to 43mph last hour

39.4 at the wantagh meso. Decent but still pretty meh after the event earlier this month. Let’s see if my theory of the winds dropping under the heaviest rain verifies. If it does strongest winds will be right ahead of the line

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10 minutes ago, LongBeachSurfFreak said:

39.4 at the wantagh meso. Decent but still pretty meh after the event earlier this month. Let’s see if my theory of the winds dropping under the heaviest rain verifies. If it does strongest winds will be right ahead of the line

Your theory has verified out here.  Strongest gust to 36 mph just before the squall line hit.  Still gusts to about 20 mph with heavy rain, lightning and thunder as it passes through here.

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