On Mar 28, 9:03 am, Norman Lynagh normanthis...@thisbitweather-
consultancy.com wrote:
I was very surprised that the haze didn't get a mention on the Radio 4
forecasts this morning given that it is, and has been, so thick, so
widespread and so persistent across most of the country. The impression
given by the forecasts was that some parts would have fog at first but
once that had burnt off there would be bright sunshine but with some
showers developing in the west.. In reality, if the past couple of days
are anything to go by, there'll be hazy sun from a milky sky and below
30 deg elevation the sky will be a dirty brown colour.

A very good example of what it looks like in NW Scotland can be seen on
one of the webcams on Skye at

http://www.smo.uhi.ac.uk/smo/dealbha...in/english.php

The view in good visibility can be seen by clicking on "More information
and options".

Norman
(delete "thisbit" twice to e-mail)
--
Norman Lynagh Weather Consultancy
Chalfont St Giles 85m a.s.l.
England

The forecasters/presenters don't know properly what haze is,
as we all know, so when the real thing turns up they don't recognise
it.
It is now (2.55 pm) very "dirty" here. There is some
towering Cu but it is difficult to see either the bases or the edges
due to the haze. The whole sky is a dirty orange-grey. Earlier,
before the TCu build-up, the haze was higher and the sky so milky it
was easy to mistake for Cs. In fact, for a few moments, I did. The
whole appearance of the sky has been very summery.
As I understand it the milky haze is caused by particles
that are large relative to the wavelength of light and scatter all
wavelengths more or less equally whereas the yellow-orange-brown
colour is due to smaller particles (1 micron?) which preferentially
scatter the shorter wavelengths, leaving the red.
I have no idea why the haze is so thick as its origin must
be central Europe, not notably hot, dry and windy at this time of
year. There was also the dusty rain a few days ago, probably from the
same source.

Tudor Hughes, Warlingham, NE Surrey, 556 ft.