Thick low cloud/stratus covers the Swiss Plateau, with a top between 800 and 900 metres ... in northern Switzerland, a strong easterly wind (the Möhlin jet) is pushing it into Alsace. There is still snow in the Alps (shown in blue), but noticeably less than usual.

Snow cover Thursday morning: Widespread green, snow-free conditions across Central Europe, extending even into Eastern Europe, southern Scandinavia, and southern Iceland (by snow report). Snow still in the Alps (by Alps Snow Monitor).

Growing more common as the climate warms, once-rare “atmospheric rivers” could ultimately accelerate ice loss. www.science.org/content/arti...

November 2025 brought in the end some snow, frost and ice - but December 2025 was so far much too warm: all over Europe (by JMA)

The first South Pole Overland Traverse (SPOT) of the season arrived at the #southpole this week! There are three traverses that travel between McMurdo and Pole each season, which bring about 75% of the fuel in each season. Pic by Michael Rayne. #Antartica @NSF

Settled and exceptionally mild conditions across central Europe. Meanwhile, a depression is developing over the eastern Atlantic, tracking across Ireland on Tuesday as low BRAM, with further intensification expected till midnight. Expected maximum 24-hour wind gusts (km/h) for Tuesday from EURO1k.

New map update

Calender year 2025 so far: 2nd (globally) or 3rd (Europe) warmest since 1940 (ERA5) Kudos to @climatologist49.bsky.social

ERA5 temperature ranking for November and autumn 2025

Preliminary analyses of November 2025 using ERA5 data indicate that globally, it was the third-warmest November on record, while in Europe, it was the warmest since 1940. Thx to @climatologist49.bsky.social

Today, the 1st of December, marks the commencement of the meteorological winter—a date designated just for climatological record-keeping purposes. Snow cover today ↙️, as indicated by both model projections and select measurements, compared to the same date last year ↘️

AIFS Ensemble plots are now available on PolarWx for a limited number of map projections: polarwx.com/models/?mode...

An interesting #spaceweather story developing. Airbus has made a statement saying that “Analysis of a recent event involving an A320 Family aircraft has revealed that intense solar radiation may corrupt data critical to the functioning of flight controls” www.bbc.co.uk/news/article...

Once again sunny early-winter day in Switzerland, seen by Terra/Modis. North of the Alps - above 600/700m amsl - now significant more snow than usual (source SLF). Next week southern side of the Alps will finally also get the white stuff :-)

Updated animation of #CopernicusAtmosphere daily mean PM2.5 surface concentration forecasts showing development of Indo-Gangetic Plain #AirPollution between 1-27 November. More info/#OpenData access: ads.atmosphere.copernicus.eu/datasets/cam... #airquality @copernicusecmwf.bsky.social @ecmwf.int

November 2025 will end in Europe with temperatures again significantly above the 1981–2010 climatological reference period. In the Alps, the marked anomalies of both very warm and very cold spells are expected to balance out, particularly when compared to the more recent 1991–2020 reference period

The recent onset of winter has resulted in above-average snowfall across Switzerland for late November; however, conditions are expected to change at the beginning of December.

Derived Ash Height product from @eumetsat.int #meteosat10 suggested that parts of the volcanic ash cloud from the eruption of #HayliGubbi in Ethiopia may have reached heights in the 18-20 km range (black).

Last night brought widespread frost, locally record lows, lower lows than last winter and alpine cold-air pools with –36.8°C surpassing temperatures in northern Norway! Forecasts indicate a thaw on Monday, with milder conditions persisting until Christmas (Zurich ensemble) 😲

Following >50 cm of fresh snow locally over the past three days (@slfdavos.bsky.social), today in the Swiss Alps sunny weather with wintry snow cover (blue-tinted). Low stratus over the lowlands, neatly streaked by northeasterly winds.

Thick smog over India and Kashmir valley, fog/low stratus in the valleys of Nepal ... as seen by Terra/MODIS on Saturday noon.

Arctic air from Greenland, fresh snow, and clear Saturday-night: perfect recipe for severe cold across Central Europe by Sunday morning. Only southern Alpine lakes remained frost-free; some alpine valleys may reach –30°C! A thaw is already expected next week...

A polar vortex of confusion simonleewx.com/2025/11/20/a...

1,019 glaciers have disappeared since 1973 in Switzerland! ✝️ 1st nationwide assessment of vanished glaciers: >40% of the glaciers inventoried in 1973 ~13% (47±3 km²) of total glacier area loss! 🧊🔥 But, as it is based on the latest inventory (from 2016), the actual figures are far much higher! 📈 😰

Recent SSTAs (sea surface temperature anomalies) clearly indicate La Niña in the tropical Pacific, expected to persist until the end of winter. This has little direct impact on our winter weather; instead, the seas around Europe—currently much warmer than average—play a more significant role

The global record 134 °F surface temp, measured in Death Valley in 1913, is "implausible" based on other records from that date, claims a paper in #BulletinAMS. The authors suggest the temperature was recorded at an improper location. More on the blog: https://bit.ly/3LCKPgS

Arctic air surging from Greenland brought last night the lowest temperatures in the High Alps since early March: Capanna Margherita near Monte Rosa recorded –21.9°C. First fresh snow (coloured blue) down to ~700 m in eastern Switzerland and southern Germany.

Record warmth still over southern Europe/northern Africa↙️ ... but in 150 hours with arctic air from Greenland follows record cold ↘️

First half of November 2025 was in Europe mostly too warm. In Switzerland about +1 (south) to +5 (mountains) degrees warmer than usual - now followed by a colder second half.

The 2025 Atlantic Hurricane Season officially ends on November 30, but the outlook is very quiet out there, so it very likely ended on October 31 this year. Overall, it was a slightly above-average season with some strange characteristics.

Strong southerly foehn (gusts to 107 km/h) again yields anomalously warm conditions north of the Alps for this season. However, textbook description of a warm wind with good visibility does not hold today: Saharan dust at ~3 km altitude reduces visibility! saentis.roundshot.com#/compare/195...

Circling the world over the last couple of nights, the aurora borealis put on quite a spectacular show in the sky of the northern hemisphere.

1,600+ fossil fuel lobbyists at COP30, outnumbering every delegation except Brazil This isn’t ‘dialogue’; it’s the industry responsible for the crisis hijacking the negotiations meant to stop it If this doesn’t make you furious, you’re not paying attention www.theguardian.com/environment/...

Despite the impressively cold conditions anticipated across Central Europe next week: all available models indicate that the winter of 2025/2026 (1 December to 28 February) is expected to be overall warmer than average.

Despite a robust boundary-layer inversion exceeding 10K, fog was notably absent this morning over the Swiss Plateau. Persistent dense high cloud cover remained, while MTG imagery revealed dense Saharan dust-cloud near the Balearics—most accurately depicted by the Monarch and Met Office UM models.

Beneath dense, yet transparent cirrus clouds at high altitude (10–12 km, as recorded by the Payerne ceilometer), persistent fog blanketed the Swiss Plateau until midday. This was capped by a pronounced temperature inversion (10 K) and, notably, remained confined to the Lake Constance basin.

Polar light, aurora last night seen from below (eastern Switzerland, starting 02 UTC) and from above (SNPP, day/night band).

Snow cover in the Swiss Alps remains around average, but with record warmth expected over the next few days — a freezing level rising to around 3,500 m — it is likely to decrease significantly. Beyond that, however, there is considerable uncertainty (according to the GFS ensemble) 🤔

🧊 A new mass-balance season is in its second month. How are Swiss glaciers doing so far? Time for a check! Real-time #observations and #modelling for 12 #glaciers show nothing exceptional so far: snow cover remains thin (25–100 cm). Conditions have returned to average or slightly below. Data: GLAMOS

A midday Terra/MODIS (NASA) satellite image from Saturday reveals cloudless, snow-covered (blue-tinted) Alpine region, with fog/low stratus blanketing adjacent lowland plateau between Lake of Geneva and Constance and with a top of 700-800m partially inundating prealpine valleys.

For the calendar year 2025 to date (January–October), global temperatures rank as the second warmest in the ERA5 record (since 1940), with Europe experiencing its third warmest such period.

Typical autumnal satellite imagery with fog over the Swiss Plateau. An atypical anticyclonic southerly föhn is sweeping across the Alps: no clouds to the south, yet amid small pressure difference gusts of 60 (Hasli Valley) to 106 km/h and temperatures of 20°C in Elm+Brig - beneath the fog just 4°C

October 2025 was globally 3rd warmest since 1940. Kudos to @climatologist49.bsky.social

More than 40% of existing and planned offshore wind farm sites in Europe and Asia are being exposed to wind speeds above the maximum design load of some classes of turbine, according to a study in Nature Communications. go.nature.com/3LmAPZ2 🧪

🔥🔥🔥A record warm October for the Arctic (60N to 90N) AND a record warm October for the Antarctic (60S to 90S). This is a disaster. 🔥🔥🔥

Settled, dry, and often fine autumnal weather prevails across central Europe. Meanwhile, a record-breaking extratropical cyclone—termed a “weather bomb”—has intensified near Newfoundland, with a minimum central pressure of 943 hPa recorded on Wednesday morning.

a century of glaciers melting 🧪🌐

Swiss Alps see up to 30cm of fresh snow locally (Grison, e.g. Juf↙️—the highest (2216m amsl) permanently inhabited village in Western Europe). According to Modis/Terra: more snow today ⬇️ than this time last year ↘️

Southerly foehn across the Alps today, with localised gusts exceeding 80 km/h in the Haslital, Urner Reusstal, and Liechtenstein regions. Temperatures are rising above 20°C in northern Grisons, the Sargans area, and also northwestern Switzerland.

A meteor lit up the sky over Kangerlussuaq, Greenland 🇬🇱 this evening, and it was even caught on the airport’s live camera!