Hi all,

Can someone explain to me what gravity waves are?

TIA,

-Perry-



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On 12/9/03 9:13 AM, in article ,
"Perry" wrote:

Can someone explain to me what gravity waves are?

It's what made Acton MA get 15" of snow instead of neighboring Concord's
25"!

Other than that, I'd like to know, too!

- Steve Stein


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"Perry" wrote in news:3fd5d860$0$14952
:

Can someone explain to me what gravity waves are?

http://pcl.physics.uwo.ca/pclhtml/gravitywaves.html

Jim


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*laughing* And here in Framingham, also.

I heard it said on the forecast, when there were bands of snow, but my logic
failed me on how it could be related to gravity. I look forward to being
educated!


"Stephen Stein" wrote in message
...
On 12/9/03 9:13 AM, in article ,
"Perry" wrote:

Can someone explain to me what gravity waves are?

It's what made Acton MA get 15" of snow instead of neighboring Concord's
25"!

Other than that, I'd like to know, too!

- Steve Stein


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Thanks, Jim. I think I may have to read that several times before I get an
inkling!


"Jim" wrote in message
news:qnlBb.486461$Fm2.472061@attbi_s04...
"Perry" wrote in news:3fd5d860$0$14952
:

Can someone explain to me what gravity waves are?

http://pcl.physics.uwo.ca/pclhtml/gravitywaves.html

Jim


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A range of weather-related phenomena in the lower atmosphere generates
gravity waves. Examples include fronts (e.g., Eckermann and Vincent 1993),
squall lines (Alexander et al. 1995), convective clouds (e.g., Alexander and
Pfister 1995), cyclogenesis (e.g., Powers 1997), typhoons (e.g., Sato 1993),
geostrophic adjustment of jet steams (e.g., Kaplan et al. 1997), flow over
mountains (e.g., Ralph et al. 1993), and so on. If wind patterns aloft are
favorable, some of these waves can propagate into the middle atmosphere. Due
to decreasing atmospheric densities, gravity waves grow in amplitude with
height and so must eventually generate instabilities and "break."

Strongest upward motions with Gravity Waves occur just following the surface
pressure trough and lead to maximum precipitation rates just ahead of the
ridge.

Gravity waves typically form within or near the back edge of a precipitation
shield.

Recent studies indicate that Gravity Waves may occur as frequently as 34% of
the time in the Central US during the Winter months.

Above taken from this great link on gravity waves and forecasting:

http://www.erh.noaa.gov/er/akq/GWave.htm



Regards,

Declan








"Perry" wrote in message
...
Thanks, Jim. I think I may have to read that several times before I get
an
inkling!


"Jim" wrote in message
news:qnlBb.486461$Fm2.472061@attbi_s04...
"Perry" wrote in news:3fd5d860$0$14952
:

Can someone explain to me what gravity waves are?

http://pcl.physics.uwo.ca/pclhtml/gravitywaves.html

Jim


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Thanks, Declan. I'm digesting it all.

"Declan Cannon" wrote in message
.. .

A range of weather-related phenomena in the lower atmosphere generates
http://www.erh.noaa.gov/er/akq/GWave.htm



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Just in case you need some more info:
http://hugo.atmos.colostate.edu/tutorial.html
http://cyclone.atmos.uiuc.edu/MM5/Talk/sld001.htm

Some nice diagrams included.
Declan


"Charles M. Kozierok" wrote in message
...
In article ,
Perry wrote:
} Hi all,
}
} Can someone explain to me what gravity waves are?

During the storm I was in a chat room with my friend Eric M who is a met
and I saw the patterns show up on the radar in this area. I asked him
and he showed me a great graphic that I wish I could find.

A quickie "lay" explanation is that the air passing up over the
mountains causes turbulence that sets up a sinusoidal wave in the
atmosphere. The "ripples" are caused by this wave pattern... you can see
it on satellite loops during nice weather more easily. We get them all
the time around here, but I can't ever recall seeing them that
well-defined before during a storm..

peace,

-*-
charles


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Thanks, Charles!

"Charles M. Kozierok" wrote in message
...
In article ,
Perry wrote:
} Hi all,
}
} Can someone explain to me what gravity waves are?

During the storm I was in a chat room with my friend Eric M who is a met
and I saw the patterns show up on the radar in this area. I asked him
and he showed me a great graphic that I wish I could find.

A quickie "lay" explanation is that the air passing up over the
mountains causes turbulence that sets up a sinusoidal wave in the
atmosphere. The "ripples" are caused by this wave pattern... you can see
it on satellite loops during nice weather more easily. We get them all
the time around here, but I can't ever recall seeing them that
well-defined before during a storm..

peace,

-*-
charles


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On 12/10/03 9:39 AM, in article , "Charles M.
Kozierok" wrote:

A quickie "lay" explanation is that the air passing up over the
mountains causes turbulence that sets up a sinusoidal wave in the
atmosphere. The "ripples" are caused by this wave pattern... you can see
it on satellite loops during nice weather more easily.

Why is it easier to see in nice weather instead of stormy weather?

Why did we see it during the "nor-easter" part of the storm, where the winds
weren't going over the Berkshires but coming over the coastal plain?

- Steve Stein


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