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Sea mist can spoil the outing
BY Wijke
Ruiter
Last
week, when huge parts of Britain was sun drenched, with lovely
temperatures
above 20° C, some coastal regions stayed cold and misty.
Disappointment all over for sun lovers, packing parasols, beer and
air-beds, for a nice day at the beach.A gray blanket and low clouds
awaited them.
Why this mist and why doesn't it disappear with the heat of the sun,
like every decent
fog?
Mist develops during the night, when the ground cools down by
radiation, which
occurs during a clear night sky.
Cold air can contain less moist than warm air; so when cooling down the
humidity
grows as far as a critical point is reached.
The air will vaporize and mist is born.
The process will reverse by sunrise; the sun heats the air at the
ground and
mist vanishes, if the sun has enough strength to do so.
But at the coast is didn't disappear; in some cases it even spread. Is
this
another process then?
With southerlies warm, but moist air reached the UK, bringing pleasant
weather and
lovely temperatures.
But above sea there was a huge contrast between this warm airflow and
the
temperature of the seawater, which is still low about 10° C.
Right
above the water level the air cools down, and like during nightly
radiation, mist
develops. But, unlike mist above land, this will not gradually
disappear by
sunrise.
This phenomenon provides beautiful satellite pictures, for example this
on with
mist in the Channel and the German Bight.
Mist at sea often occurs in springtime, when the seawater is cold after
the winter season.
The beach, however, is not always disappointing. When on sunny days
above
land spring showers develop (see the special); on the beach people can
be sunbathing.
And you'll be one of the few who knows this by reading our specials, so
no
crowded beaches for you in spring.
mailto:wijke@scribeweekly.com
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