Here in Hull we are in the rain shadow of the Pennines, but 10 miles to the
west of me are the Yorkshire Wolds. The height of these hills range from
500-800 ft. Do these hills provide an extra "defence" for Hull or are they
too low? And if they are too low is there a specific height a hill(s) should
be before a rain shadow occurs or does the cloud base height make the
difference?

Regards
Mag

is there a specific height a hill(s) should
be before a rain shadow occurs?

Mag,

In two articles in 'Weather' in 1983, John Stone, then a climatologist in
London concluded that hills of a little of 50m. relative elevation can
influence rainfall patterns in eastern England, in terms of (slight) orographic
enhancement and rain shadow effects. So the Yorkshire Wolds are certainly high
enough, though it all depends on low level wind direction of course. I would
imagine that the Lincs Wolds may be important with the frequency of S/SW
winds. Others will have more detailed local knowledge but the rainfall averages
do follow elevation closely in even 'lowland' eastern England. Of course, if
there is strong cyclonic uplift or convection, this relationship may be
obliterated.

yours,

Julian Mayes,
Univ of Surrey Roehampton & West Molesey,
Surrey
- often in the rain shadow of the North Downs.

Hull is at the eastern side of the Vale of York - it's a well known
'hotspot' with the storms tracking down the Humber or north from
Lincolnshire.

Les

--
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk

"Mag" wrote in message
...
Here in Hull we are in the rain shadow of the Pennines, but 10 miles to
the
west of me are the Yorkshire Wolds. The height of these hills range from
500-800 ft. Do these hills provide an extra "defence" for Hull or are they
too low? And if they are too low is there a specific height a hill(s)
should
be before a rain shadow occurs or does the cloud base height make the
difference?

Regards
Mag




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See the thread above named 'active cell'. This was a bunch of single cells
tracking down the Vale of York and Lincs. There was a brief vshape on radar
near Doncaster around 1300BST.

And I was at work - !!

I rest my case.

--
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk

"Les Crossan" wrote in message
...
Hull is at the eastern side of the Vale of York - it's a well known
'hotspot' with the storms tracking down the Humber or north from
Lincolnshire.

Les

--
Les Crossan,
Wallsend, Tyne & Wear 55N 01-30W,
Home of the Wallsend Stormcam - http://www.uksevereweather.org.uk

"Mag" wrote in message
...
Here in Hull we are in the rain shadow of the Pennines, but 10 miles to
the
west of me are the Yorkshire Wolds. The height of these hills range from
500-800 ft. Do these hills provide an extra "defence" for Hull or are
they
too low? And if they are too low is there a specific height a hill(s)
should
be before a rain shadow occurs or does the cloud base height make the
difference?

Regards
Mag




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Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.504 / Virus Database: 302 - Release Date: 24/07/2003




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