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| Flooding threat western Scotland Eastern rivers also rising By Garry Nicholson | |
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| Tweet Topic Started: 26 Oct 2014, 02:42 PM (72 Views) | |
| Audi-Tek | 26 Oct 2014, 02:42 PM Post #1 |
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>> Simon's Weather Musings << Flooding threat western Scotland Eastern rivers also rising By Garry Nicholson in Darley Dale, Derbys 13:00hrs 26/10/2014 A continued south-westerly airflow, combined with slow moving fronts to the north of Scotland will produce near continuous heavy rainfall across western mountains over the next couple of days. Rainfall totals from various models are consistently very high, with around 150mm of rain forecast between the middle of Sunday and early Tuesday, and undoubtedly more over some western mountains. This is a classic case of ‘orographic enhancement’ where a moist airflow is forced to rise over a mountain barrier, giving considerably higher rainfall totals than would been seen in the absence of mountains. A classic ‘rain-shadow’ effect will mean eastern areas to the lee of the mountains will see very little rainfall compared to the deluge further west. A recent example of this type of prolonged heavy rainfall event in the UK brought the severe flooding to Cumbria in November 2009. Compare this too with very high rainfall values expected in western Norway, where similar processes are taking place in the same airflow and frontal situation. Many streams in the western highlands are expected to flood, and this will feed into the main river systems over the next few days. Also, rivers which flow eastwards may rise considerably, such as the Spey and Tay which originate in the central highlands. These will need monitoring for potential flooding despite rainfall totals having been considerably less in these areas. So far, values of 40 to 50mm which have already fallen in the 24 hours up to midday on Sunday at various recording stations in the West Highlands. In the past 48 hours, Loch Glascarnoch in the north-west Highlands received 83mm, whilst on the Isle of Skye there was 70mm, so these areas are already well underway with this period of prolonged rainfall. Contrast this with a value of 15mm at Aviemore in the Cairngorms, whilst barely any rain has fallen in Aberdeenshire. ![]() Source ............ http://www.weatherweb.net/ |
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8:08 PM Jul 11