The highest air pressure in the UK for over 60 years has been recorded in Wales – in the Mumbles, Gower.

Atmospheric pressure readings were recorded at 1050.5 hectopascals (hPa) on Sunday night – the highest reading since January 1957 in Scotland.

Weather experts said an “incredibly strong” Atlantic jet stream had pushed vast amounts of air over the UK – sending the mercury rising.

It means a spell of settled weather – with some frosty mornings for some.

According to the BBC Weather service, the high pressure system has been driven by winds hitting 238mph (383km/h) over the central Atlantic ocean.

In turn, that has lead to a “pile-up” of air over the British Isles, pushing down on the land mass, with the increase in air pressure.

By comparison – the global average air pressure is 1,013 hPa.

In contrast to the highs – during the recent Storm Brenda, the air pressure slumped to just 939 hPa as the cyclone moved across the north Atlantic.

The highest recorded reading for air pressure at sea level in the UK was in 1902 at Aberdeen, when it hit 1,053.6 hPa – or 31 inches of mercury if you are looking at your old wall barometer.

Source: bbc.com

This summer has been a season of intense contrasts for Australia. Now Canberra is being hit by a severe hail storm.

 

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Australia’s south-east has been lashed by severe thunderstorms and large hailstones that destroyed buildings and cars in Canberra and left two tourists in hospital after they were injured by lightning.

Two supercell thunderstorms brought hail and heavy rain to cities and towns across the east coast on Monday, battering the outer suburbs of Sydney about 3pm, with 4.5cm hailstones recorded and strong winds bringing trees down over cars in the Sutherland area.

In Canberra, where two people were also treated for minor injuries, a 15-minute blast of wild weather just before 1pm resulted in wind gusts up to 117km/h, while golf-ball-sized hailstones smashed through car windows and ripped branches from trees.

 

Source: The Guardian

 

 

Στο παρακάτω βίντεο εκτός από χαλαζοπτώσεις θα δείτε και μία εντυπωσιακή dust storm:

 

 

 

Πηγή: The guardian

It seems that we really miss snow this winter in Europe. However, Canadians never miss it! Watch the breathtaking timelapse video in this article!

 

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In Newfoundland of east Canada the snow is abundant. The following 24-hour timelapse video shows a balcony which is vanishing due to a prolonged blizzard occurred on 18/1/2020!

 

 

Last week’s snowfalls caused deadly avalanches in Pakistan and Afghanistan. Snow is occurring over many mountains in the country.

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Some of us may may not think of snow when hearing the word ‘Pakistan’. However, the mountains of Pakistan are able to receive high amounts of snow during the winter,

This year, snow exceeded any expectations and sadly avalanches caused dozens of deaths (on 14/1/2020) in nortwest mountains of Pakistan (Neelum Valley, altitude 2000 m).

 

The video below shows how the situation was:

 

In the next video, a rescue team try to find for survivors in a dramatic way among a snow storm:

 

 

Watching the nice aspect of snow, a train traveler is checking on his list the wish “Watch some snow” traveling to the city of Quetta, through the region Shela Bagh at 1900 meters of altitude (central Pakistan).

 

 

Finally, another youtube user highlights the historic occurrence of snow in Khyber Pakhtunkhwa on 17/1/2020, a region of just 960 meters of altitude:

It looks like a scenery of a sci-fi movie, but this apartment block has been really frozen in Irkutsk of Siberia. Watch the video.

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The apartment you will see in the following video has been literally and totally frozen. The pipes were broken and the water immediately froze being contacted by the frozen air.

It should be noted that Irkutsk is located in Siberia, north of Mongolia and the temperature fluctuates during the last days between -10°C and -25°C.

 

Everyone can realise that this winter has already been fairly warm over Europe. There is a map showing the ugly truth.

In the following NCEP map the mean surface temperature anomaly is depicted for the period 17/12/2019-16/1/2020. The reference period is 1981-2010.

It is fairly clear thay the last 30 days were particularly warm in Scandinavia and northeastern Europe (up to +8°C). This fact actually led to quite weak cold outbreaks in Balkans around Christmas. Although the northeastern corner of Europe was the warmest, the rest of out continent was also much warmer than the mean climatic temperature in the middle of this winter with temperature anomalies between +1°C and +6°C. The regions with the lowest anomalies were around the Mediterranean sea.

It is impressive that even places in central Greece, where significant snow occurred (at places more than 30-40cm), the temperature was still above the mean seasonal temperature.

Concluding, the signs are getting more and more ominous and the situation seems to have been sufficiently estimated be the climatic models (e.g. heating is much more intense in higher latitudes). Thus, it seems to be a good point of time to think deeply about the climate change.

 

 

Starting before Christmas, the atmospheric circulation has changed over Europe with the coldest conditions being located over Balkans at the moment. Bu t what about next?

Analyzing the situation, we try to find clues in order to get an idea of the weather that we should expect for the next fortnight.

 

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The first and very important hint is the expected position of the Azores anticyclone, which is the main system that manages and distributes the cold air over Europe. Having a look at figure 1 we can realize that most of western Europe is highly likely to be under anticyclonic conditions for a prolonged period and only the very north countries (e.g. Scandinavia) will be affected by some cyclonic systems. As a mater of fact, the predicted surface atmospheric pressure for the next fortnight is around 1020 to 1030mb, a forecast that is supported by most of GFS prognostic members, but also by most of ECMWF ones (see graphs for Iberia, Central France, South UK και Norway).

The only unclear point is how north the anticyclone will move. This can be seen in the ensembles of the UK and Norway. The position of the anticyclone is crucial if we want to make a prediction of the exact regions that will be affected by one or more consecutive cold outbreaks in eastern Europe. These cold outbreaks will reach fairly south countries as Balkans and even Greece till at least 13/1/2020.

Figure 1 – GFS ensemble forecast till 14/1/2020

 

 

In the meanwhile, NAO and AO indices seem to drop to slightly negative values highlighting the possibility for weakening any systems in north Atlantic ocean and the southern movement of cold air masses (figure 2).

Figure 2 – Prediction of NAO and ΑΟ indices (www.cpc.ncep.noaa.gov)

 

Finally, in figure 3 a new stratospheric heating is expected in Siberia and eastern Europe, which means that the cold air masses that were established and developed there will released and move southwards to eastern Europe. This is definitely another clue we should take into account.

Σχήμα 3 – Θερμοκρασία στην στάθμη των 10mb (στρατόσφαιρα) όπως προβλέπεται από το GFS στις 6/1/2020.

 

So, concluding for the first fifteen days of January we should expect a quite mild weather in most of western and central Europe. However, cold weather and snow may visit eastern Europe from Italy and to the east and from eastern Scandinavia to Greece.

North Iceland is affected by severe snowfalls today (10/12/2019) and till early Thursday. The scenery is almost spooky.

 

Impressive pictures coming from Iceland weather cameras, while a brave man goes out driving into the snow. At some places snow depth is expected to exceed 150 cm!

 

Here are some print-screens from the live weather cameras in northern Iceland:

 

Here you can visit the livestreaming cameras:

http://213.167.146.196:8150/en/mjpgmain.asp

https://www.skidalvik.is/is/skidasvaedi/vefmyndavelar

https://www.livefromiceland.is/webcams/akureyri/

 

More cameras you may visit here:

https://www.extremeiceland.is/en/multimedia/iceland-through-webcams

Definitely, the most of Europe is facing a quite mild and relatively warm, in average, December till now. However, there are hints that the circulation pattern will totally change before Christmas.

The current situation

Consecutive low pressure systems coming from the Atlantic ocean are affecting and will continue affecting the weather of western and northern Europe for the next ten days (so till 20/12/2019). This will not allow any significant cold outbreaks around Europe preserving a fairly mild weather and restricting any weather activity mainly in western and northern Europe (Iberia, eastern Italy, France, the UK and Scandinavia. In the meanwhile, the coldest corner of Europe will be (as usual) only the central and northern parts of Scandinavia.

The lack of of cold outbreaks in Europe is depicted by the temperatures in the stratosphere over the north hemisphere (Figure 1). In particular, it seems that for the next ten days the north pole will be well isolated from the rest of the north hemisphere and will “put away” cold air.

 

Figure 1. Temperature at the level of 10mb as predicted for 19/12/2019 12z.

 

What’s next and the hints

The first tool that we may use for estimating the future situation is the indices NAO and AO. During the last 24 hours, there is a small but maybe significant change of both these indices. AO index appears to drop to negative values around 20/12/2019. Similarly, NAO index decreases to slightly negative vales. Combining this information, we may conclude that according to NAO index, the Atlantic activity will weaken, and according to AO index, a cold outbreak may occur in Europe. However, this will not take place before 20/12/2019.

So, for the last ten days of this December, there is another clue supporting the change of the weather pattern. There have already been a few GFS ensemble members (almost 50% of them) predicting an establishment of an anticyclone over the Scandinavia. If something like that happens, the weather will get quite Christmasy in eastern and maybe southeastern Europe, while Christmas will be fairly dry in west and northwest Europe.

 

Stay tuned till our next article, which will come up once we get more reliable data about the period around C

 

 

Μετά τις 20/12/2019 διαφαίνονται και κάποια σενάρια εγκαθίδρυσης Σκανδιναβικού αντικυκλώνα, όπως φαίνεται και στα προγνωστικά μέλη του GFS για την περιοχή της νότιας Νορβηγίας (σχήμα 2). Πιο συγκεκριμένα, σχεδόν το 50% των μελών αυτή τη στιγμή “βλέπουν” την ανάπτυξη υψηλών πιέσεων στην περιοχή. Αν αυτό συμβεί, τότε θα επιτραπεί σε ψυχρότερες αέριες μάζες από τη Ρωσία να κατέλθουν νοτιότερα.

Heavy snowfalls occurred in north Italy during the last days. The Italian Alps were buried in a snow layer of more than 1.5 meters at places.

Although October and November are the most humid months of the year for Italy, this year the precipitation heights reached record values.

Severe snowfalls started in the Italian Alps on 15th November covering surfaces with a 1.5 meters-thick layer of fresh snow.

 

The accomodation Madonna di Campiglio is buried in snow. A similar situation is presented in the lake Pragser Wildsee and the town Cuneo.

 

 

People shared loads of videos and pictures of the heavy snowfall in the region on tweeter:

 

https://twitter.com/i/status/1195347981651914753

 

Meanwhile, heavy rain occurred in Trento, where finally turned into snow. The snow depth reached 0.8-1.2 meters. According to the local authorities, there are disruptions in the local road network.

The phenomena will persist until Tuesday (19/11/2019).

 

Source: sputniknews