How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

On Tue, 2 Jun 2009 at 22:23:32, wrote in
uk.sci.weather :

How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

I was wondering that, myself.

I guess it can only be to do with the dryness of the air on both sides
of the CF?
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)

Paul Hyett wrote:
On Tue, 2 Jun 2009 at 22:23:32, wrote in
uk.sci.weather :

How come this time there are no thunderstorms? Usually when the air
changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

I was wondering that, myself.

I guess it can only be to do with the dryness of the air on both sides
of the CF?
Yes I was going to ask that...have to say i'm terribly disappointed!
Feels bloody humid here in Powys.

Rob.

wrote:
How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/



Not being a physicist, I can't comment on the dynamics, but my anecdotal
experience is that when the cooler air arrives behind a front moving
north to south, it doesn't involve any atmospheric hijinks. When it
arrives behind a front moving south to north, then it goes bang.

I can remember driving home from London one July day when it had been
widely 30+c across SE England. By the time I got home (near Swaffham,
Norfolk) it was grey and misty with a temperature of about 13c. No rain,
no thunder, nothing.

It happens.

--------
Chris
Swaffham, Norfolk

On 2 June, 22:23, wrote:
How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

The front was a kata cold front as it travelled through the high
pressure this provides sink above the frount limiting developement.
There was a small chance that ahead of the front some potential
instability could have been released. I noticed the peaks a pennines
developed some faily large cu for a time around the middle of the day
but no CB. What we really need to trigger the storms would be to get
the thickness of 564dm to move over the uk.

Simon (South Yorks)

On Jun 2, 10:23*pm, wrote:
How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

The change to cooler air was confined to the lower layers thus
increasing the stability rather than reducing it, quite unlike the
case where the breakdown of a hot spell comes from the west where the
upper air cools while the surface remains warm for a time. This time,
rather unusually, it was the other way round. There was no related
marked change in the upper air pattern though there will be over the
net few days.

Tudor Hughes, Warlingham, Surrey.

On 3 June, 22:05, Tudor Hughes wrote:
On Jun 2, 10:23*pm, wrote:

How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

* * * The change to cooler air was confined to the lower layers thus
increasing the stability rather than reducing it, quite unlike the
case where the breakdown of a hot spell comes from the west where the
upper air cools while the surface remains warm for a time. *This time,
rather unusually, it was the other way round. *There was no related
marked change in the upper air pattern though there will be over the
net few days.

Tudor Hughes, Warlingham, Surrey.

With all of the above in mind I wonder how rare a phenomenon this is -
ie cool air moving north to south in summer?

On Jun 3, 11:44*pm, wrote:
On 3 June, 22:05, Tudor Hughes wrote:





On Jun 2, 10:23*pm, wrote:

How come this time there are no thunderstorms? Usually when the air changes
from hot air to cold air there are?

http://www.metcheck.com/V40/UK/HOME/

* * * The change to cooler air was confined to the lower layers thus
increasing the stability rather than reducing it, quite unlike the
case where the breakdown of a hot spell comes from the west where the
upper air cools while the surface remains warm for a time. *This time,
rather unusually, it was the other way round. *There was no related
marked change in the upper air pattern though there will be over the
net few days.

Tudor Hughes, Warlingham, Surrey.

With all of the above in mind I wonder how rare a phenomenon this is -
ie cool air moving north to south in summer?- Hide quoted text -

- Show quoted text -

Not that rare. It's always a danger in the eastern half of the
country during a fine spell with easterlies that a small change in
wind direction or strength or a slight increase in cloudiness can turn
a nice day into quite an unpleasant one without any significant change
in the pattern on a synoptic scale.

Tudor Hughes, Warlingham, Surrey.

wrote:

With all of the above in mind I wonder how rare a phenomenon this is -
ie cool air moving north to south in summer?

Taken globally, it's equally as rare/common as warm air moving from south to
north. It follows a similar rule to "what goes up must come down". ;-)

In NW Europe, cold outbreaks can be a feature of early June following a warm
spell. This is known as the European Monsoon.

--
Graham P Davis, Bracknell, Berks., UK. E-mail: newsman not newsboy
"I wear the cheese. It does not wear me."