Vetus Meteoliner Anleitung Seite 38

9-2 Westerly weather
The changeable nature of westerly weather is shown up very well
on the baroscope. Every time a belt of rain passes, this is faithful-
ly registered by the Baroscope. Like illustrations from a meteoro-
logical textbook, the passage of both warm and cold fronts is
shown with equal clarity, regardless of the degree to which these
fronts actually affect the weather.
Warm fronts in summer scarcely have any effect upon the weath-
er, merely bringing a slight, and then only transient, increase in
cloud cover. After a prolonged period of falling pressure, the
baroscope shows a 1 to 2-hour period of less rapid drop - this is
the warm front (a).
Date Time
Time scale (past 24 hours)
a) Warm front
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10.0801
Pressure
Date
in hPa
Time scale (past 24 hours)
b) Cold front
In contrast to this, the baroscope shows a meteorologically active
warm front by an abrupt transition from a period of falling pres-
sure to one of constant pressure lasting several hours. Cold fronts
are seen in distinct and sustained pressure drops followed by
equally distinct rises in pressure. The more abrupt this turn-
around in the pressure tendency, the faster the weather front will
have moved away (b).
If the pressure continues to rise, the cold front then brings fair
weather in its rear. At first the pressure climbs rapidly, which is
why it is accompanied by brisk winds. As soon as the rise in pres-
sure slows off (c), the wind dies down and the clouds disperse.
After one day of sunshine, rainy weather ensues again - and in
Northern and Central Europe, this may well last for soveral weeks.
Pressure
Time
in hPa
c) Intermediate high
Date Time
Time scale (past 24 hours)
Pressure
in hPa
Baroscope