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Severe Weather potential 9/8/12


weatherwiz

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I wonder what if anything that surge of moisture does from the south during the day. Some of that may be interesting as it moves in ahead of the line.

Yeah that stuff might be interesting. These types of days usually go linear pretty quick tho I think. I guess there is a window for something particularly C PA thru C NY and then east to about the New England border and a line running south of it. No cap might be good if you can get some quick small supercells.

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Yeah that stuff might be interesting. These types of days usually go linear pretty quick tho I think. I guess there is a window for something particularly C PA thru C NY and then east to about the New England border and a line running south of it. No cap might be good if you can get some quick small supercells.

Yeah anything severe out ahead of the main line will probably be some ugly relatively low topped supercells.

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Hey guys; it's been a while. I have been dealing with family issues lately but definitely wanted to give the board my two thumbs up for this event. Unlike the last several set ups which were thermodynamically-driven (or dependent), this will be the first true synoptic/kinematic-driven, autumn-like, event.

Notice the mid level dewpoint's (particularly 700mb) standard deviations with the dry punch and the strong moisture advection that takes place tomorrow morning in the low levels. As this cyclone matures, anticipate all advective processes to be a bit stronger than modeled today. The very wrapped up / slower solutions are preferred by NCEP but we must wait to see how the 00z runs do after the convection is established this afternoon and wave amplifies.

I agree 100% with the moderate risk issuance. The only bad news for the forum is that we will get another round of morons from NYC who will complain when they get missed. :axe:

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The 12 km RPM tomorrow is very meh. Nasty squall line to the west but nothing of note here other than low stratus and showers during the day lol.

Yeah tough to say if it's just like 1800ft cumulus cigs (if you know what I mean) or will it have any good oomph to it as the LLJ cranks behind it. I think it will probably have some sct stuff.

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Hey guys; it's been a while. I have been dealing with family issues lately but definitely wanted to give the board my two thumbs up for this event. Unlike the last several set ups which were thermodynamically-driven (or dependent), this will be the first true synoptic/kinematic-driven, autumn-like, event.

Notice the mid level dewpoint's (particularly 700mb) standard deviations with the dry punch and the strong moisture advection that takes place tomorrow morning in the low levels. As this cyclone matures, anticipate all advective processes to be a bit stronger than modeled today. The very wrapped up / slower solutions are preferred by NCEP but we must wait to see how the 00z runs do after the convection is established this afternoon and wave amplifies.

I agree 100% with the moderate risk issuance. The only bad news for the forum is that we will get another round of morons from NYC who will complain when they get missed. :axe:

You look to be in a decent spot.

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Yeah anything severe out ahead of the main line will probably be some ugly relatively low topped supercells.

Do you mean thunderstorms immediately ahead of the squall line or the stuff associated with the moisture advection midday?

I am not sure about the severe potential ahead of the main line other than new updrafts that immediately form ahead of the squall.

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I agree...I expected a MDT on this outlook but it is far more expansive in almost every direction than I imagined it would be. But with such favorable kinematics, one can understand the concern.

Yeah.. sorta my thoughts as well. The trough and surface explosion are pretty sick. Undoubtedly someone's gonna get rocked. Now to just get it to tail south a bit. :P

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Hey guys; it's been a while. I have been dealing with family issues lately but definitely wanted to give the board my two thumbs up for this event. Unlike the last several set ups which were thermodynamically-driven (or dependent), this will be the first true synoptic/kinematic-driven, autumn-like, event.

Notice the mid level dewpoint's (particularly 700mb) standard deviations with the dry punch and the strong moisture advection that takes place tomorrow morning in the low levels. As this cyclone matures, anticipate all advective processes to be a bit stronger than modeled today. The very wrapped up / slower solutions are preferred by NCEP but we must wait to see how the 00z runs do after the convection is established this afternoon and wave amplifies.

I agree 100% with the moderate risk issuance. The only bad news for the forum is that we will get another round of morons from NYC who will complain when they get missed. :axe:

Awesome post!

I LOVE these fall setups where we have incredibly strong dynamics and forcing...seeing a 60-70 knot MLJ streak is something to take pretty seriously. Being in the RFQ of a 90-100 kt ULJ streak too will certainly do wonders.

Hope all is well with the family!

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Do you mean thunderstorms immediately ahead of the squall line or the stuff associated with the moisture advection midday?

I am not sure about the severe potential ahead of the main line other than new updrafts that immediately form ahead of the squall.

I mean ahead of the squall line. I could see some stuff forming prior to the line across the Catskills and Poconos before being overtaken by the main line.

Will have to watch any discrete activity out front... but I don't expect anything from the midday moisture advection.

Nice to have you back posting here!

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I agree...I expected a MDT on this outlook but it is far more expansive in almost every direction than I imagined it would be. But with such favorable kinematics, one can understand the concern.

There is a bit of logic to the eastward extent and isn't entirely weather-based.

When thinking about verifying, where are you most likely to get a report? Certainly, it will be in the more populated coastal plain corridor (plot population on the convective outlook). If a well developed squall line, entirely based in the synoptics and low CAPE, is moving toward a more populated area but slowly weakening, I am sure there will be a few reports on the eastward extent in this instance.

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You look to be in a decent spot.

Obviously the timing, severe mode (squall line) and speed will likely prevent any last minute bootleg chase. At this point, I am just hoping I can still make out the shelf cloud at sunset (the right timing can make for pretty colors like purple / red / pink).

Awesome post!

I LOVE these fall setups where we have incredibly strong dynamics and forcing...seeing a 60-70 knot MLJ streak is something to take pretty seriously. Being in the RFQ of a 90-100 kt ULJ streak too will certainly do wonders.

Hope all is well with the family!

Thanks. I agree about autumn events. There are several historic events in Sep-Nov with some very famous tornado outbreaks among them. The family is doing better this week, thanks.

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Euro is pretty fast. Fropa near HFD by 00z.

Yeah if that timing happened....I could see western areas involved for sure. This doesn't look like a line racing east to me. I think it's one of those lines marching relatively quickly east with individual cells or segments flying NE and causing the winds.

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Obviously the timing, severe mode (squall line) and speed will likely prevent any last minute bootleg chase. At this point, I am just hoping I can still make out the shelf cloud at sunset (the right timing can make for pretty colors like purple / red / pink).

Thanks. I agree about autumn events. There are several historic events in Sep-Nov with some very famous tornado outbreaks among them. The family is doing better this week, thanks.

Yeah Sep-Nov can have it's share of epic events, especially across PA/NY/NJ area. When I first looked at this setup the first event that came to mind was November 16th, 1989.

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I mean ahead of the squall line. I could see some stuff forming prior to the line across the Catskills and Poconos before being overtaken by the main line.

Will have to watch any discrete activity out front... but I don't expect anything from the midday moisture advection.

Nice to have you back posting here!

Thanks...

Oh I can see that too about some stuff in NE PA / etc. I hope the midday moisture advection crap is painless for our area.

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Obviously the timing, severe mode (squall line) and speed will likely prevent any last minute bootleg chase. At this point, I am just hoping I can still make out the shelf cloud at sunset (the right timing can make for pretty colors like purple / red / pink).

Thanks. I agree about autumn events. There are several historic events in Sep-Nov with some very famous tornado outbreaks among them. The family is doing better this week, thanks.

Mid/upper 70s for SSTs is not going to hurt our cause witha 40-50 knot southerly LLJ.

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