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Written by John Olzsewski
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For a Wet Day to occur we need considerable
surface heating, a layer of reasonably moist surface air, alto (middle) level
moisture and unstable air. This mix, under certain conditions, is what gives us
in our arid climate the odd so-called Wet Day. The definition of a Wet Day is
60mm or more on one day.
Wet Days are often marked by severe
hailstorms because of the massive convection inside the cumulonimbus clouds
from which they originate.
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Written by John Olzsewski
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For the past seven months, the state of the
Pacific Ocean has been progressing towards the identity of a full-blown La
Nina. This development has taken some time and is, so it seems, far from
complete.
Consistency of weather maps,
surface and upper air, sea-surface temperatures and under surface correlation,
strengthened trade wind flow and extent of their push and, the final result:
that of weather patterns consistent with the La Nina-type pattern.
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Written by John Olzsewski
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That the daily rainfall work reveals
another (weather) world is, I think, by now apparent to interested readers.
Certainly, for me, from very early in the daily rainfall entry work, this new
world came more and more into ranges of focus. The next feature was that one
very wet day.
The Temperate rainfall zone does,
occasionally, refer to an extreme downpour as a “cloud burst”, but other than
being a lot of rain very quickly, definition disappears into the distance.
600 mm isohyets were used as the benchmark
for this feature: falls of 60 mm in one day were described as being a Wet Day.
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Understanding Weather 
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