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 The
weather forecast said
'Scattered Showers'
You've just set out on a ride and the clouds are forming on
the horizon. Two things are certain in this situation, if
you stop and put on your windproof / waterproof jacket, it
won't rain but if you don't stop, you'll be soaked to the
skin within minutes.
"Boll%!*~s .. .. it's started to rain"
Wouldn't it be advantageous if you could work out which
clouds were going to rain on you, and which weren't. 'Well
here's how to do just that ...!'
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WHAT
WILL BLOWING WIND DIRECTIONS BRING ?. |
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WHAT
WILL THE GROUND BE LIKE IF IT RAINS ?. |
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U.K.'S WIND
DIRECTIONS AND WHAT THEY WILL BLOW IN !. |
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In general, the weather is strongly influenced by the wind
direction, so information about the wind provides an indication
of the type of weather likely to be experienced. However, this
approach is effective only if the wind is blowing from the same
direction for some time. A marked change in wind direction
usually indicates a change in the weather.
Northerly winds tend to bring relatively cold air from polar
regions to the British Isles. Similarly, southerly winds tend to
bring relatively warm air from the tropics. The characteristics
of the air are also affected by its approach to the British
Isles. Air picks up moisture if it travels across the sea, but
remains relatively dry if it comes across the land.
As cold polar air moves southwards over an increasingly warm
sea, the heating of the air by the sea causes cumulus clouds to
form. These clouds may grow sufficiently for showers to develop
and, consequently, winds from the north-west, north or
north-east usually bring cold, showery weather to the British
Isles.
Warm air from the tropics moving northwards over the sea is
cooled from below. Sometimes the cooling is sufficient for sea
fog or a thin layer of stratus to form. The cloud can become
thick enough for drizzle, especially on windward coasts and over
high ground. In general, winds from the west or south-west are
associated with overcast, wet weather. |
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