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Hurricane Irene Observations Thread


Baroclinic Zone

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Let's meet and survey later if the wind dies a bit. I want to do a walking tour but am eschewing that activity in deference to TBI prevention.

Sounds good!

I drove around Brookline and Cambridge an hour ago. Predominantly tree limbs down.

Let's see what this LLJ can produce in the next few hours. Light has flickered 3 times in past half hour but I've been lucky so far.

TBI prevention indeed... an onlooker driving around was waiting at a red light in downtown Philly last night and had his car crushed by a falling tree, he crawled out the back window unharmed.

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Tip, thoughts on LLJ today?

It is what it is and verifying nicely... Thing is, you are not typically going to see the LLJ on the ground... what is it now, 60, 70, 80kts at 900mbs?

Either way, the friction that contribute to boundary layer turbulance will keep a good percentage of those velocities off the lowest levels. This can be shown mathematically with boundary layer mechanics and we had to learn that in college - ouch.

What it boils down to is that wind flow will tend to follow the path of least resistance, and turbulence near the surface does not allow that path, so the "boundary pause" separates that region from the level of free flowing air - commonly referred to as the gradient level. The LLJ is basically the inflow into the dying cyclone just above the boundary pause.

This is not always true, such as times when there is convective processes in play - you get your biggest damage outside of tornado action from down-drafting through a LLJ and inducing a momentum transfer into the boundary layer. Fancy talk for having said LLJ be forced down. That could happen today, but much of the convection is escaping N now and we are losing better transfer potential by the hour.

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Any specific timing on the LLJ stuff or are we pretty much done? Kind of enjoyed watching this with my power on.

The graphic a lot of people were referencing here when we were talking about the LLJ took a turd this morning. It's come way down from what it was earlier, do not know if it's real or not, but maybe the timing is off and we're not going to see it? This was filled with 50s and some 60s as of early this am for 2pm today.

WindGust3_box.png

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let's hope not. That looks pretty serious.....

All rivers on the eastern slope of Berkshires are going insane right now. Green River seemed to be escaping for awhile - either that or no reports came out of it, but we've learned a house has been swept away in Colrain and there may be evacs into Greenfield

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Man what a crazy past 8 months across southern New England...a historic winter or top 5 winter for many, one of the most devastating tornadoes in nearly 50 years, a fairly potent earthquake to our south which affects felt in southern New England, and now the biggest and most destructive impact from a tropical system since Gloria in 1985...what the hell is next on the list for us?

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Not sure what to make of these. Some pretty impressive #'s.

***********************SUSTAINED WIND***********************

LOCATION WIND TIME/DATE COMMENTS

SPEED OF

MPH MEASUREMENT

CONNECTICUT

...HARTFORD COUNTY...

1 WNW WINDSOR LOCKS 35 829 AM 8/28 BDL ASOS

MASSACHUSETTS

...BARNSTABLE COUNTY...

EAST FALMOUTH 48 1134 AM 8/28

...BRISTOL COUNTY...

FAIRHAVEN 50 843 AM 8/28

...DUKES COUNTY...

3 S VINEYARD HAVEN 53 919 AM 8/28 MVY ASOS

...NANTUCKET COUNTY...

2 ESE NANTUCKET 37 805 AM 8/28 ACK ASOS

...NORFOLK COUNTY...

3 SSW MILTON 35 738 AM 8/28 MQE ASOS

...SUFFOLK COUNTY...

1 N EAST BOSTON 37 929 AM 8/28 LOGAN ASOS

RHODE ISLAND

...KENT COUNTY...

2 NNW WARWICK 64 639 AM 8/28 T.F. GREEN ARPT

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Man what a crazy past 8 months across southern New England...a historic winter or top 5 winter for many, one of the most devastating tornadoes in nearly 50 years, a fairly potent earthquake to our south which affects felt in southern New England, and now the biggest and most destructive impact from a tropical system since Gloria in 1985...what the hell is next on the list for us?

Yea you guys killed it this year. Send some juju up this way.

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Man what a crazy past 8 months across southern New England...a historic winter or top 5 winter for many, one of the most devastating tornadoes in nearly 50 years, a fairly potent earthquake to our south which affects felt in southern New England, and now the biggest and most destructive impact from a tropical system since Gloria in 1985...what the hell is next on the list for us?

meh here...

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