meteo internazionale
by MeteoNews AG
Venerdì scorso, 27 settembre, si è formata una tempesta tropicale nel Pacifico. Attualmente si trova a circa 200 chilometri a nord-est delle Filippine e si sta rapidamente rafforzando diventando un tifone. Minaccerà Taiwan nella prossima settimana.
Reto Vögeli
La depressione tropicale è apparsa sulle carte meteorologiche venerdì scorso, 27 settembre. È nata sull’Oceano Pacifico a circa 500 chilometri a nord-est delle Filippine, sul Mare delle Filippine. Ad oggi, il sistema si è sviluppato in una tempesta tropicale con velocità medie del vento fino a 110 km/h, spostandosi lentamente verso sud-ovest. Ciò significa che la tempesta tropicale è ora sul punto di essere altamente classificata come tifone (da 118 km/h). Krathon si svilupperà in un tifone questa domenica.
Fig. 1: Situazione attuale della tempesta tropicale Krathon; Fonte: CIMSS, University of Wisconsin
Il tifone Krathon continuerà a guadagnare energia e forza sul mare caldo nelle prossime ore e giorni. Il ciclone rimarrà sul mare fino a martedì, quando farà landfall nel sud di Taiwan. Secondo i calcoli attuali, colpirà la costa nell’estremo sud dell’isola con una velocità media dei venti di poco superiore a 200 km/h e con un picco di oltre 250 km/h, ossia con la massima forza. L’ondata di tempesta sarà enorme!
Ci sono diversi approcci al percorso ulteriore del tifone nella modellazione. È molto probabile che il tifone Krathon si sposti verso nord, proprio sopra Taiwan, indebolendosi leggermente. Oltre ai venti distruttivi, ci saranno enormi quantità di pioggia, soprattutto nel sud e nell’est di Taiwan. Localmente, sono possibili fino a 1000 mm. Per fare un paragone, questo equivale all’incirca alle precipitazioni annuali dell’Altopiano svizzero! Inondazioni e frane sono inevitabili con queste quantità di pioggia.
Fig. 2: Previsioni di precipitazioni in relazione al tifone Krathon.; Fonte: UBIMET
Se il percorso del treno è quello descritto sopra, almeno la parte occidentale e settentrionale di Taiwan, più densamente popolata, sarà meno colpita. Tuttavia, è probabile che anche qui si verifichino quantità considerevoli di pioggia e temporali.
The content of this article has been at least partially computer translated from another language. Therefore, grammatical errors or inaccuracies are possible. Please note that the original language version of the article should be considered authoritative.
astro Switzerland
There will be a partial lunar eclipse on Friday morning, but in this case it will be a fairly unspectacular and brief affair. There can be no talk of a “blood moon”! This can be observed in September.
Klaus Marquardt
bioweather Switzerland
A January that was 1.5 degrees too mild for the whole of Switzerland and a February that was 1.7 degrees too mild, as well as the exceptionally mild March so far, are having an impact on nature: as has often been the case in recent years, nature has woken up earlier than normal and is currently about a week to ten days ahead. Winters are becoming milder and milder as a result of climate change, which means that nature is waking up earlier and earlier and the growing season is being extended. This has a variety of effects, both positive and negative. In particular, the risk of late frosts causing damage is increasing.
Roger Perret
weather Switzerland
After last week’s spring-like mild weather, the temperature curve is clearly pointing downwards this week in unstable conditions, but the exact extent of the cooling is modeled differently. It is also not clear how much precipitation will fall in total. In the north, however, the amounts are unlikely to be too large, whereas in the south, quite a lot of precipitation is expected overall.
Roger Perret
weather international
Typically, the lowest sea ice extent is reached in the Arctic in mid-September, while the highest is reached in the Antarctic. This time is therefore particularly suitable for taking stock of the past northern summer or southern winter.
Michael Eichmann
weather lexicon
A halo is a fascinating celestial spectacle in which luminous rings or arcs form around the sun or moon. They are formed when light is refracted or reflected by ice crystals in the atmosphere. Halos are not only an impressive sight, but also a wonderful example of the beauty and mystery of nature.
Quirin Beck
weather Switzerland
Up to and including the weekend, we can still enjoy the current spring overture. The nights are cold, the days are pleasantly mild – in the Alps assisted in part by the Foehn. Next week, the weather will become more changeable again and we can also expect a setback in temperatures.
Klaus Marquardt
climate international
In late fall and winter, attention is always focused on the stratospheric polar vortex. Its characteristics and behavior also have an influence on the actual weather layer – the troposphere – with a time lag. In addition, the latest long-term forecasts for the winter months were published a few days ago by the ECMWF and NOAA.
Klaus Marquardt
weather international
A storm depression is currently moving across the United States. In the southern states, this heralds the start of the severe weather season with tornadoes, while towards Canada the low brings another winter greeting. In addition, the dry winds in Texas are creating great potential for forest and bush fires.
Michael Eichmann
weather Switzerland
The whole week will be dominated by High Ingeborg, which will move from the Alps to the Black Sea by the end of the week. Apart from occasional high clouds and patches of fog that largely dissipate in the lowlands by midday, the sun will mostly shine throughout Switzerland until Saturday, with spring-like temperatures of over 15 degrees in the second half of the week. Only next Sunday is there likely to be increasingly dense clouds. With the high temperatures for the time of year during the day, the pollen count (hazel and alder) will usually be high at low and medium altitudes.
Roger Perret
climate Switzerland
In the past few hours, fresh snow has fallen in the mountains and it has also turned white in some areas in the lowlands. However, this is not really representative of the first half of February, as it has been far too mild and too dry in many regions so far.
Klaus Marquardt
climate Switzerland
From a meteorological perspective, February also marks the end of winter. As has often been the case in recent decades, the winter was on the milder side this season, with no major cold snap. There were also frequent inversions with fog or high fog over the Central Plateau and sunny conditions in the mountains.
Michael Eichmann
weather Switzerland
A disturbance will continue to affect the north today (Thursday), but from tomorrow (Friday) the weather will be largely determined by high pressure. However, a high-altitude low will cause a lot of high fog-like clouds tomorrow and on Saturday. Temperatures will be quite low in the north until Saturday (the meteorological start of spring) with a rising breeze, after which it will gradually become milder. In the south, apart from Saturday, there will be plenty of sunshine and double-digit temperature maximums throughout.
Roger Perret
astro Switzerland
Mercury is the smallest and innermost planet in our solar system. At an average distance of 58 million kilometers, it is close to the sun, which severely limits its observability from Earth. Over the course of a year, there are regular opportunities to observe it, but only for short periods of time. Such an observation window will now open up over the next two weeks, with good evening visibility.
Klaus Marquardt
weather Switzerland
The weather will be very unsettled until Thursday with a few passing but mostly quite weak disturbances, then the influence of high pressure will increase. It will be quite mild until tomorrow, Tuesday, then significantly cooler, especially at higher altitudes.
Roger Perret
bioweather Switzerland
In a long-term comparison, the 2025 pollen season is starting early at low altitudes with the blooming of hazel and alder pollen. In the south, they have already been around for a few days. This means that allergy sufferers in the north can expect the first hay fever symptoms over the weekend.
Roger Perret
weather lexicon
Not every fog is the same. Depending on the region of the world and weather conditions, there are different formation processes and manifestations. In our region, radiation fog is the most common type of fog.
Michael Eichmann
weather international
The future hurricane low Éowyn will cause extreme wind conditions from Thursday evening, especially in Ireland, Northern Ireland, northern England and Scotland. The European mainland will only be marginally affected, with the Alpine region benefiting from a mild south-westerly current.
Michael Eichmann
weather international
Recently, the weather in the USA has been making headlines, particularly due to the Santa Ana winds and the fires in the Los Angeles area. The situation is beginning to ease, at least from a meteorological perspective. However, a massive advance of cold air is now approaching far to the south – – a so-called “arctic blast”.
Klaus Marquardt
weather international
An atmospheric river is a narrow but extremely long stream of air that transports enormous amounts of water vapor from the tropics to other regions of the world. The “Pineapple Express”, which brings moisture from the Pacific to the American west coast, is particularly well known.
Michael Eichmann
weather lexicon
Weather models are an indispensable tool in modern meteorology and play a crucial role in forecasting the weather. Until a few years ago, only numerical weather models existed, but in the age of artificial intelligence, such models are increasingly being supplemented by machine learning and AI-supported systems.
Michael Eichmann
weather lexicon
In the coming days, we will be dealing with cold air drops, also known as high altitude lows, which make life difficult for us meteorologists as it is almost impossible to make an accurate forecast. Read on to find out exactly what cold air drops or high lows are, how they form and why they are so difficult to forecast.
Roger Perret
weather lexicon
The days are getting longer, compared to the shortest days around the winter solstice, the sun is already shining more than 2 hours longer in mid-February. This also increases exposure to harmful UV radiation, and sun protection is becoming more and more of an issue, especially for activities in the snow-covered mountains.
Roger Perret
weather lexicon
The earth orbits the sun smoothly, but only apparently exactly regularly. Both the Earth’s orbit and its rotation are subject to certain fluctuations, which have an influence on the Earth’s radiation budget on large time scales. These changes in the orbital parameters are summarized under the term “Milankovic cycles” and go back to the Serbian mathematician Milutin Milankovic (1879–1958).
Klaus Marquardt
bioweather Switzerland
In a long-term comparison, the 2025 pollen season is starting early at low altitudes with the blooming of hazel and alder pollen. In the south, they have already been around for a few days. This means that allergy sufferers in the north can expect the first hay fever symptoms over the weekend.
Roger Perret
climate Switzerland
The first half of January brought relatively varied weather, with calm and dynamic phases alternating. This also applied to the temperatures, which, balanced out, were roughly in line with the long-term average across the whole country. Although there was more precipitation than usual, there was also more sunshine, especially on the Swiss Plateau.
Klaus Marquardt
weather Switzerland
Although it will be quite mild in the coming days, it will be rather unsettled. After this morning’s cold front, there will be further cold fronts on Sunday night/Sunday morning and on Tuesday night/Tuesday. In the northern Alpine valleys, especially on Saturday and Monday, the Foehn wind will blow, driving temperatures to spring-like levels of around 15 degrees and just above, which will give a boost to the blossoming hazel and alder pollen in particular.
Roger Perret
weather Switzerland
If you take a look at the ground pressure map, you can see a strong high in the medium term. However, this is only part of the truth, as a so-called high altitude low will probably also be in play at higher altitudes during the second half of the week.
Klaus Marquardt
climate Switzerland
After just over two thirds of the meteorological winter (December to February), temperatures are around 1 degree above the long-term average from 1991 to 2020. In addition to mild phases, there were also quite cold periods with icy days in the lowlands (maximum temperatures below 0 degrees). The cold was mostly caused by high pressure conditions. There has been no major imported (advective) cold so far, as has usually been the case in recent years.
Roger Perret
weather Switzerland
Today, a cold front will bring lots of clouds and wet weather. The snow line will drop to low levels by Friday morning, but it will also dry out more and more. After a transitional day on Friday, our weather will be dominated by high pressure from the weekend onwards.
Michael Eichmann
weather Switzerland
The weather has a lot to offer this week, but little that is spectacular. There will be plenty of sunshine above the fog today (Monday) and tomorrow (Tuesday), changeable weather on Wednesday and, after a cold front, friendly conditions from Thursday afternoon and mild conditions from Friday with a south-westerly aspect. In addition, the foehn will be an issue in the north on Wednesday and from the weekend.
Roger Perret
climate international
The hurricane season in the Atlantic officially started on 1 June, as it does every year. In the run-up, most institutes predicted a very active course in their forecasts. However, after the first 5 storms, the Atlantic basin was surprisingly quiet for a few weeks. The reasons for this are complex and can be attributed to several factors, but the very unusual flow pattern over North Africa probably played a significant role. In the second half of September and in October, however, the 2024 season made up for everything. Hurricanes Beryl, Helene and Milton will be remembered above all!
Klaus Marquardt
climate international
In late fall and winter, attention is always focused on the stratospheric polar vortex. Its characteristics and behavior also have an influence on the actual weather layer – the troposphere – with a time lag. In addition, the latest long-term forecasts for the winter months were published a few days ago by the ECMWF and NOAA.
Klaus Marquardt
weather international
While tropical storm activity in the Atlantic has so far remained manageable, the next typhoon is already making headlines a few days after Typhoon Shanshan in the northwest Pacific. Yagi has already caused damage and fatalities in the Philippines in recent days and is now strengthening over the South China Sea and is expected to make landfall in southern China on Friday or Saturday.
Michael Eichmann
weather international
Just under a week ago, a tropical depression formed over the Pacific. Over the past few days, this has intensified into Typhoon Shanshan. On Thursday, Shanshan hit the Japanese island of Kyūshū and caused extensive damage.
Michael Eichmann
weather international
A tropical storm is currently forming into a typhoon in the Pacific over the Philippine Sea. It bears the name Bebinca and will become the 6th typhoon of this year. Bebinca is expected to make landfall in China on Sunday, September 15.
Reto Vögeli
weather lexicon
At irregular intervals, a special low-pressure area makes headlines – the Vb low (the V is a Roman 5). The Vb low has a bad reputation and unfortunately often lives up to it! Such a development is also on the horizon this week, so let’s take a closer look at this phenomenon.
Klaus Marquardt
weather Switzerland
As is typical for this time of year, temperatures are currently on a bit of a rollercoaster. After last week’s cool phase, the pendulum is now swinging in a mild/warm direction and April 2024 is saying goodbye to early summer. Saharan dust has a somewhat dampening effect. This will be washed out again by rain showers in the second half of the week…
Klaus Marquardt
weather international
Another typhoon has formed over the Pacific in the past few days. Kong-Rey has now even developed into a super typhoon and will make landfall in Taiwan on Thursday. After Krathon at the beginning of the month, this will be the second time Taiwan is hit within a month.
Michael Eichmann
weather international
Heavy rains have lashed much of eastern and southern Spain over the past 24 to 72 hours, flooding streets with muddy water and disrupting rail and air transport.
Frédéric Decker
weather lexicon
Snow is a special substance, a very special whim of nature. It is not only children who enjoy thick flakes and plenty of fresh snow to build snowmen, but it is less popular with most drivers. How long a blanket of snow can last depends on several factors. In addition to the air temperature, its relative humidity also plays a role, as well as wind and rain as possible snow killers.
Klaus Marquardt
weather lexicon
In meteorology, a front refers to an air mass boundary. In the case of a cold front, a colder air mass displaces a warmer one, and vice versa in the case of a warm front. The third form is a mixture of these two, known as a mixed front or occlusion. In this article, we will focus on the first variant – the cold front.
Klaus Marquardt
weather lexicon
In the last few days, a so-called inversion layer has formed. This is a layer where temperatures do not decrease with altitude but increase. This is also referred to as a so-called barrier layer. More on this below.
Roger Perret
weather lexicon
The Santa Ana winds are a weather phenomenon in southern California and are a regular talking point, particularly in connection with forest and bush fires. They typically occur between September and March.
Klaus Marquardt
weather international
Many people are currently enjoying the vacation season and spending time in the south. It’s high season around the Mediterranean and the water is perfect for swimming. Compared to other years, however, the cooling effect of the Mediterranean is not as great this summer. In the Adriatic in particular, the conditions are almost like a bathtub.
Michael Eichmann
weather international
The west of the USA is used to high temperatures in summer. However, the current heatwave is not only worth mentioning because of the record highs in some places, but also because of its relatively long duration. In the coming days, the heat will spread further north and east.
Michael Eichmann
Lascia un commento