Chirality, vulcanism and hot chocolate.
Weatherlawyer
has a scientific view of the so called Coriolis Effect. The following
is in reference to small bowls draining:
"...centripetal accelerations in any observed spiraling motion cannot
possibly come from the tiny Coriolis force from the Earth's rotation.
Water does not go down the drain differently in Auckland than it does
in Santa Fe. In order to demonstrate the Coriolis force in this
experiment one must have a very shallow sink, and tiny drain, so that
water drains over a time period comparable to a fair fraction of a
day."
It is a combination of pressure gradient in the volume of liquid and
the degree of neutrality of the resevoir that permits the formation of
an helical vortex at the plug hole. The water at the top of the bowl
has more acceleration than that at the bottom, so is preferentially
drained.
This explains why the funnelling needs some time to get set up.
Rotation takes place because at the eye of the vortex the resultant of
dynamic forces is neutral. The pressure of falling water is the same in
every direction.
It is this pressure that allows the wall of the funnel to form. Any
predilection to rotate in a certain direction is therefore due to some
other force. Something like a seiche effect, or in the case of a bowl
of water, a vibration in the housing.
And so onto the observed absurdity of hurricana. The writer seems to
have dropped the ball here:
"Extratropical cyclones are the big weather systems of the winter
season. They have a scale (L) of about 2,500 km, a typical wind
velocity of 10 m/sec, and the Rossby number is R_o = 0.04 or so.
Obviously a Rossby number so small means that the Coriolis force is
much greater than the observed centripetal acceleration, and some
additional force is needed to maintain the observed curvature of
motion. These systems are dominated by Coriolis force balancing mainly
a pressure gradient."
http://www.sas.org/tcs/weeklyIssues_2005/2005-06-03/feature2/index.html
But back to the small resevoir:
"The speed of sound depends of two parameters: the stiffness of the
medium, and its density. Very stiff materials transmit sound rapidly.
But sound travels more slowly in dense materials, because, given the
same force, heavier things are harder to accelerate than lighter
things. It turns out that the speed of sound is proportional to the
square root of the stiffness (Young's modulus) of the medium divided by
its density."
http://www.sas.org/E-Bulletin/2004-04-02/feedback/index.html
The more dense a material the more difficult it is to transmit sound.
And the more flexible the material the more likely the material is to
absorb it. But when a vortex funnel forms as a liquid drains the
pressure on the water changes subtly.
Of course this is nothng in comparison to the changes made to the
ability of the liquid to oscillate once the volume starts to fall. But
it is interesting that once the volume starts to fall, it falls faster.
Thus funnels form as a result of vibration and tension. And their
relationship to seismic activity may be seen in the fact that as an
harmonic reaches a certain geologic feature, the pitch changes and a
certain wavelength can be observed.
This is work ascribed to Bernard Chouet who analysed the pitch of
seimic waves and found long period events:
"Chouet said they were made by molten magma resonating - that is coming
under pressure - inside the volcano. The more long period events there
were, then the nearer the volcano was to exploding. Chouet could use
the long period events to predict an eruption to within days."
http://www.bbc.co.uk/science/horizon/2001/volcanohell.shtml
I need hardly point out that Mr Choet is not a geologist as it is a
given that if you remove ollyology from earth science you are left with
nature and no geologists.
It's time we took the earth back from the monkeys!
Weatherlawyer
Weatherlawyer wrote:
> "...centripetal accelerations in any observed spiraling motion cannot
> possibly come from the tiny Coriolis force from the Earth's rotation.
Talking about centipedes; the Japanese have a legend I believe about a
knight saving the land from a quake or something referred to as a
centipede.
Looking at this site reminded me of it:
http://www.meteo.be/gfx/Images/Forecasts/kmi_front48EN.jpg
But what is interesting (or may become so) is that this chart:
http://www.westwind.ch/?link=ukmb,http://www2.wetter3.de/Fax/,.gif,bracknell+00,bracknell+24,bracknell+36,bracknell+48,bracknell+60,bracknell+72,bracknell+84,bracknell+96,bracknell+108,bracknell+120,bracknell+132
for Friday the 28th July 2006 shows an occlued front apparently coming
out of the ground. (Between 55 and 73 degrees north and some 15 and
more degrees east.)
Normally when an occlusion gets to Norway or Sweden, it dissipates as a
rain band emptying over Germany and the rest of western Europe. Such
fronts form over the Atlantic in most years and wash ashore on Norway
accompanied by major geophysical events according to the NEIC lists.
First warnings of course will as usual be heralded by the usual
aircraft and mining disasters and maybe a few sailing unpleasantries.
Have fun.
Felix Tilley
news:1153671328.7...@b28g2000cwb.googlegroups.com:
>
> Weatherlawyer wrote:
>
[deleted]
Still a kook.
Weatherlawyer
I see school's out again.
Weatherlawyer
Weatherlawyer wrote:
> Normally when an occlusion gets to Norway or Sweden, it dissipates as a
> rain band emptying over Germany and the rest of western Europe. Such
> fronts form over the Atlantic in most years and wash ashore on Norway
> accompanied by major geophysical events according to the NEIC lists.
http://earthobservatory.nasa.gov/Newsroom/NewImages/images.php3?img_id=17340
http://earthobservatory.nasa.gov/Newsroom/NewImages/Images/sst_anomaly_2006_197_lrg.jpg
The image shows sea surface temperature conditions in the Atlantic and
the Gulf of Mexico on July 17, 2006, compared to average conditions
(1985-1997).
Cooler than average temperatures are blue, red is warmer and where
temperatures were around average, they are white. A swath of
cooler-than-average temperatures arcs northeast away from southern
North America, while to the south, a wide region of warmer than normal
temperatures stretches between Africa and Central America. These
warmer-than-normal sea surface temperatures in what is known as
"Hurricane Alley" will become important as the hurricane season
progresses.
[Actually the regions that were most active are now blue. There appears
to be a line of hot water just north of the Antarctic where it is deep
winter -and there is a strong current normally running along that
latitude.
The actual hot spots are semi land locked. Their water exchanges are a
confluence of brine at depth and brackish on the surface where river
runoff flows out to sea and the ocean comes in to replenish sea levels.
Totally landlocked areas are white.]
One explanation for the cool swath is a smaller-than-average southward
extent of the Bermuda High. The Bermuda High is a semi-permanent area
of high atmospheric pressure that shifts position in the Atlantic
between Bermuda and the Azores Islands, off the coast of Portugal.
According to indicators tracked by the National Oceanic and Atmospheric
Administration (NOAA), the Bermuda High did not extend as far south as
it normally does, and it has been weaker than normal since mid-June.
[That's the Azores High is it not? It has been flaring ridges into the
North of Europe. Crippling the European players in The World Cup and
giving the Mediterranean and South American teams an unfair advantage.
The event is invariably held in summer and European fixtures are
normally played in the winter.]
Tropical storms that form tend to travel around the edge of the Bermuda
High in a clockwise circle. When the Bermuda High shifts south and
west, as it did in 2005, the path of storms takes them right into the
Gulf of Mexico.
[Frail reasoning there as the season was marked with an earlier than
norrmal start and a later than normal close as well as several of the
most damaging events ever. This has hardly been mirrored elsewhere this
year, even though temperatures are abnormally high in the northern
reaches.]
The current predictions from the National Hurricane Center are for a
very active 2006 Atlantic hurricane season.
[So they must start any time now? Oddly I have this year booked in as a
seimically highly active one with the brunt of the energy being
utilised as volcanic activity. Perhaps for the same underlying reasons.]
Weatherlawyer
I prefer the term genius. Though it has to be admitted that as far as
the blind and stupid goes there is very little difference in the way
your kind fail to see the things a genius can see or the things a
madmad sees.
For recent visitors to this site:
Felix is the resident troll whose main staple is posting addresses
belonging to the people who affront his senses (such as they are.) He
is a frail and sensitive soul though, which is probably why he keeps
harping on about an earthquake he experienced long ago and ran away
from.
I doubt in all the groups he visits he ever does more than a bit of
inconsequential policing. The foolish, benighted netkop.
Meanwhile, back on earth, the planet seems to have experienced a major
shake up on May the 30th. Check for yourselves which of the two of us
is really the kook by finding out what happened then.
Notable among them the surfeit of volcanic activity. I really would
love an explanation for that activity that is anywhere near as good as
mine.
Kook? From that lemon, high praise.
Weatherlawyer
Weatherlawyer wrote:
>
> > Normally when an occlusion gets to Norway or Sweden, it dissipates as a
> > rain band emptying over Germany and the rest of western Europe. Such
> > fronts form over the Atlantic in most years and wash ashore on Norway
> > accompanied by major geophysical events according to the NEIC lists.
> I have this year booked in as a seimically highly active one with the brunt of the energy
> being utilised as volcanic activity.
The first piece of evidence I have come up with though circumstantial,
seems to be that in years where there is an heatwave in Britain there
is a world wide dearth of large mag earthquakes. Something around 6 or
7 if I guess correctly. But an abundance of volcanic activity is
reported earhtwide, as if in compensation.
In years where they are most frequent there are twice as many. I don't
know if the level of volcanic activity drops but I rather suspect it
does.
More circumstantial evidence is a liability for anticyclones to behave
like cyclones in the North Atlantic in casting off fronts towards
Europe.
And one more seems to be that occluded fronts seem to show no urgency
to dissipate once thrown ashore.
All early conjecture of course but then so was this:
http://groups.google.com/group/alt.talk.weather/browse_frm/thread/d5f1fe793ec4a549/#