Posted by Co2sceptic on Jan 27th 2013
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Satellite images breathtaking scary cyclone in the Atlantic, but the real show is the UK's snowy surface - by Peppe Caridi, Google Translate Meteoweb.eu Italian/English

We have already spoken at length of ' impressive extratropical cyclone deep 930hPa over the Atlantic Ocean: is what immediately jumps to the eyes looking at the maps of these hours, with a swirl of clouds really scary ocean, bound for Europe and namely the United Kingdom, where the cyclone will come in the next few hours. But the real show maps of the UK today it is almost completely covered with snow after frost and bad weather of recent days.

In fact, much of Europe is covered with snow and ice, including France, but many clouds from the ground prevent us from observing the satellites as it does now for Scotland and England, where the sky remained clear. Tomorrow, this will cause deep cyclone storms between Spain North / West Africa and Portugal, and strong winds over much of the continent. It is from this deep low pressure systems will release tomorrow evening trough that will be cut / off on Italy causing the passage of a fast and intense disturbance between Monday and Tuesday, with rain and storms too strong especially in the Tyrrhenian regions of our country, the first the mild cyclone in the following days, between late January and early February, will provide full sun and mild temperatures throughout Italy


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On the Atlantic north took shape the powerful "depression-hurricane" fallen below 930 hpa: latest updates - by Daniel Ingemi, Google Translate Meteoweb.eu Italian/English

As predicted by the models, over the North Atlantic began to take shape a powerful extratropical cyclone, now classified as a deep "depression-hurricane," with a minimum baric ground dizzy, fell below the threshold of 930-928 hpa. A truly impressive value for extratropical low pressure systems. This is definitely the cyclone extratropical North Atlantic deepest ever observed in recent years. It takes considerable force thanks to a strong positive vorticity advection that has come to realize over a wide area "baroclinic" in migration to the North Atlantic. Within this area "baroclinic", located in the middle of the ocean, are converging air masses significantly different from each other that help to fuel the process ciclogenetico, favoring a unique insight into the structure of the vortex, ready to reach remarkable values ​​baric , with a minimum of ground estimated to subassemblies of 928 hpa. The spark that ignites the intense vorticity is due to the huge gap between the thermal East Coast of the U.S., hit by a wave of intense frost descending from the Arctic Canada, and the Atlantic Central and Eastern Europe, affected by rising air masses much milder and humid, which tend to exacerbate these thermal contrasts, facilitating the initiation of the large process ciclogenetico south of the coast of Greenland.

If we add to this the presence of a large positive anomaly of the troposphere (in practice the height of the tropopause presents a minimum with adjoining cyclonic circulation, with a substantial lowering of the surfaces Isentropic), well distributed between Eastern Canada and the stretch of ocean at southern Greenland, the picture is very complete for the formation of a powerful "hurricane-depression" as that observed at this time, aided by a deep minimum altitude Geopotential under 480 Dam. too, the flow of the main branch of the "jet polar ", outbound from the United States, along the southern edge the broad cyclonic circulation set out above, is emphasizing the advection of vorticity in the heart of the North Atlantic, giving the structure further cyclonic vorticity, as rarely observed in these contexts. Looking at the slow-motion replays transmitted by satellite we can see that the profound "depression-hurricane" has already passed the stage of maturity, between late morning and early afternoon today, presenting a truly spectacular cyclonic eye, located in the ocean south-west of 'Iceland, surrounded by bands of clouds spiraling well pronounced, just like tropical cyclones, with clear structure "barotropic".

The powerful extratropical cyclone Atlantic is associated with an extensive and intense frontal system, which has a large cold front, followed by very cold air masses extraction Canadian Arctic, that the high-latitude ocean stretches to the Atlantic sub-tropical with the end of the front very active in the south-west of the Azores. Further east there is a strong warm front classic with its northern outcrop boarded the British Isles, dispensing new snow up at low altitude over Scotland and England, while scattered showers are king in Ireland and Wales, which highlights a progressive increase of the thermal values ​​in all dimensions, for the influx of thesis winds from the South and S-SO (air masses origin of sub-tropical ocean) along the pre-frontal area of ​​cyclonic circulation. On the southern coasts Irish, for example, are exceeded +9 ° C +10 ° C. Behind the deep minimum baric ground however, instead of the two opposing sides now, already dominates occlusion that surrounds the small central eye, almost never entirely free from clouds. The structure is expected to reach maximum intensity at this very hour, before starting to weaken in the next night, when the deep minimum baric evolve in the south-west of Iceland, losing some of its original potential.

Despite a gradual weakening of the deep "depression-hurricane" will be capable of producing strong gales, O-SO and West, on the southern edge of the deep cyclonic circulation, with gusts that exceed the 130-140 km / h, locally even in the most violent storms, capable of lifting massive waves of "living sea", which can grow up to 9.10 meters in the section to the south-west coast of Iceland. Strong easterly winds are expected on Iceland, in particular, on the northernmost coast of the volcanic island, which will be swept by strong cold winds from the E-NE and NE. In these eight o'clock rather strong, but from the south, you are recording on the stretch of ocean off the coast of Ireland and west of Scotland, where several buoys and maritime stations reported very strong winds, usually from the south, S-SE and SE , reaching peaks of more than 80-90 km / h in gusts. Also notable is the increase in the wave, linked to the intensification of ventilation. Some oceanographic buoys located west of the Irish coast this morning continue to signal the passage of waves quite high, about 4-5 meters, with an average direction of propagation from S-SW. In the next few hours, with the entry of the impetuous winds from O-SO, the wave is going to increase even more with the arrival of large waves formed once more that tomorrow will spread to the west coast of Ireland and the Scottish, generating heavy storms, ready to strike with great force on the western coasts of Ulster and the Hebrides. Fortunately, the deep vortex depressionario, going gradually to fade, it should not represent any threat to the emerging areas of Iceland and the British Isles, which will suffer only a sustained, at times intense, cyclonic ventilation.


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