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Everything posted by chris55
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Looks to be a trend for some ppn to hang around much later into tomorrow than originally forecast (although my faith in the forecast generally has subsided, it’s nice to see perhaps the potential has stretched out into tomorrow as well). Midday tomorrow on the ‘potential’ radar and the early hours through till morning on the app! Here’s to Lady Luck
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Wet ground does not stop snow from settling, I have seen this theory posted so many times in various threads. If the air cools enough, and the dew points fall below freezing then the damp ground will freeze as the snow falls, and the snow will settle perfectly. If the air is slightly to mild or the dew points are to warm then it won’t settle regardless of how wet or dry the ground is. Evaporative cooling is a good example of how heavy snow can fall but not necessarily settle. Of course there is always a complex set of parameters involved with snow settling, but the ground being wet doesn’t dictate if it settles or not.
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Nice little reminder from Ian on how det-op runs in the mid term can be, and often are, open to change. Obviously if there is clear cut synoptic pattern in the offering with cross model support, like a raging jet or stagnant Bartlett in situ then we may place more trust in the mid term Det runs. But alas our current output is full of uncertainty.
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At this stage the Apps will give an indication of where the front will be in our area locally (and thats pretty much our entire region) the intricacies of ppn type and intensity will be a now cast scenario. We always moan, question and interrogate our app symbols to the death whenever a potential snow event is looming (I’m the same). But at this close range all we need to do is watch the Radar for approach and longevity and then watch the window for how good (or bad) things are playing out IOBY