So this is pretty amazing - yesterday EarthCARE sampled Hurricane Humberto straight across the eye! The eye of a tropical cyclone is small so a direct hit is rare: this is the first time EarthCARE has hit one after over a year in orbit! (Showing here also VIIRS on NOAA-20 for context.)

first frost of the autumn in northern Helsinki today.

Windy day ahead tomorrow. One major factor is the powerful jet stream that facilitates cyclogenesis. Not so often we'll have 90 m/s wind speeds above us.

The summer as a whole was the 4th warmest on record. Note how the top 4 warmest years all occurred during the last 4 years.

Another extremely warm August on Svalbard. If it looks tame, that's only because last year obliterated the records.

PS. the current summer is on track to become the 5th warmest on record on Svalbard. Substantially less warm than last year's, but note that up to 2020, a summer temperature like this was never measured.

Do you remember last year's crazy summer temperatures on Svalbard? A new study by Schuler et al., published this week, finds that by the second half of this century, summers as warm as last year’s will be normal, or even relatively cool.

Our latest research investigates the remarkable heatwave that affected part of the Arctic in the summer of 2024. It caused a 1 percent loss in Svalbard's ice, making this region one of the most significant contributors to global sea-level rise last year www.pnas.org/doi/10.1073/...

Very sharp cold front will arrive in the west coast of Finland tonight. The front is associated with wind gusts of > 20 m/s, heavy rainfall and possibly lightning.

In July Fennoscandia was hit by a heatwave similar to one that hit the region in 2018. In just seven years, similar events have become almost twice as likely due to increased global temperatures from 1.1 to 1.3°C. Every fraction of a degree matters! www.worldweatherattribution.org/intense-two-...

Great to present our recent study on the record-warm summer of 2024 in Svalbard ❄️🔥, right in the climate change hotspot of Longyearbyen itself. A full audience and great discussion afterwards at UNIS. On Tuesday I’ll be giving a lecture to students of the Polar Meteorology and Climatology course.

This July reminded us that in the north, heat is not a distant threat but is seeping into hospitals, care facilities & homes. Our infrastructure was not built to withstand these extreme temperatures and our population is increasingly susceptible to dangerous heat www.theguardian.com/environment/...

The start of August has once again been exceptionally mild on Svalbard.📈 But still ~1°C behind 2024’s record 'schedule'. A new record is unlikely. Temps will drop next week, and the preconditioning isn't as 'favourable' as last summer. 📍Longyearbyen (Svalbard) | 1–12 Aug mean temps 📊Data: @yr.no

The start of August has once again been exceptionally mild on Svalbard.📈 But still ~1°C behind 2024’s record 'schedule'. A new record is unlikely. Temps will drop next week, and the preconditioning isn't as 'favourable' as last summer. 📍Longyearbyen (Svalbard) | 1–12 Aug mean temps 📊Data: @yr.no

The massive anvil cloud from thunderstorms over the (other side of) the Gulf of Finland is now obscuring the sun all the way here in Helsinki! 🌩️

20 straight days with 30 °C in Finland! Truly unprecedented heatwave still in full swing with maximum today about 32-33 degrees. Even the Arctic regions (e.g. Sodankylä Tähtelä) have seen three weeks above 25 °C, and may rival tomorrow their August heat records.

🔵➡️🔴 Here is what the exceptionally persistent heatwave is doing to sea surface temperatures in the Baltic and Norwegian Seas. 📈 🧊 The Baltic Sea was unusually cold earlier this summer, but look how fast the SSTs flipped! 🔥 🧵 (1/2)

A cumulonimbus cloud doesn’t get much more perfect than this. 🌩️ This is a thunderstorm located south of Tallinn, Estonia. 🇪🇪 At ~120 km distance, this bad boy is visible all the way from the other side of the Gulf of Finland. 🇫🇮

And as it turns out, no station in Lapland saw such a long streak of days >25°C before. bsky.app/profile/mika...

🔥 These days, summer heat just seems inevitable. Even after a relatively cool period, it’s usually just a matter of time before exceptional warmth finds its way. 🌡️☀️ Helsinki is now in a persistent hot spell, with daily highs near or above the 90th percentile for two weeks.

🌩️ Beautiful convection to the northwest, spotted from the roof of the Finnish Meteorological Institute.

⛈️ Finally a refreshing thunderstorm in Northern Helsinki last night. Nevertheless, the heat persists. Tomorrow, the heatwave peaks with potentially 30°C in Northern Helsinki.🌡️

⚡️🌩️ Thunderstorms over northern Estonia🇪🇪 clearly visible from the office of the Finnish Meteorological Institute🇫🇮! 90-100 km horizontal distance!

🌡️⛈️ After measuring the warmest day of the year so far (32.2°C in Kaskinen Sälgrund), intense thunderstorms formed over southern Finland.

Sticky air in southern Finland: dew points are very high. 🥵 The relative humidity is fluctuating between 60–90% depending on the time of day and location.

Warmest June sea surface temperature (SSTs) on record for the Mediterranean Sea (compared to all Junes). 36% of the Mediterranean Sea had the single warmest June SSTs (since 1940).

A rapidly deepening cyclone carrying an extremely moist airmass will track over the Baltics and SE Finland in the upcoming 24h. Total column water vapor >40 mm and high rain rates bring widespread 30-50 mm, and locally up to 60 mm of rain, in southern and eastern Finland.

Rare summer storm incoming👇🏼

Judging by the MEPS wind gust for SW-Finland, I wouldn't be surprised if the warning level were upgraded to red, which in summer requires wind gusts of 25 m/s. At the western coast, the wind will pick up very quickly as the centre of the low passes over the region.

For decades, the Dutch🇳🇱 temperature record was held by Warnsveld, a questionable measurement, but a record of 38.6°C in 1944. The record got broken on 3 consecutive days in 2019 (surpassing 40°C on 2 of them). Surpassed again in 2022. And today, again: Maastricht 39.0°C.

🌡️ Western Europe’s in for a sweat. 🥵 France and Spain will see widespread temperatures around or above 40°C. Germany, the Netherlands and eastern parts of the UK will be hot too. Projected max temps in 🇫🇷, tomorrow 👇

My challenge to you is to talk about it (more). Talk about climate change. Talk about the importance of the scientific infrastructure in the US. Talk about the implications of these cuts on the economy, our health, public safety, the environment, and what this means for the next generation as well.

Large areas in the Mediterranean Sea are more than 5°C above the average temperature for the time of year. 🌡️ figure by: @copernicusecmwf.bsky.social 🧵 (1/2)

This is how the climate changed in the 3 locations where I spent most time in my life. First: Amsterdam🇳🇱, located right next to the town where I was born and raised #ShowYourStripes #ClimateChange #ClimateStripes 🧵(1/3)

🥵🇳🇱 This is an extremely warm ensemble forecast for June. Forecast is for the south of the Netherlands.

Spitsbergen is zijn poolklimaat aan het verliezen🌡️ In @trouw.nl schreef ik over de (Nederlandse) geschiedenis van de archipel, én onze studie naar de recordwarme zomer van 2024 📈❄️ 🔗➡️ www.trouw.nl/wetenschap/d...

Hazy sunset in Vantaa, Finland 🇫🇮 last night. Smoke from Canadian wildfires made it all the way here!

This is one of many examples of how EVs (and sustainable alternatives in general) are much more efficient than the fossil-fuel alternatives.

The atmospheric CO₂ concentration continues to grow (and accelerate).

A somewhat chilly night / morning in Finland, with frost in the large majority of the country.

The extremely warm summer of 2024 in Lapland not only surpassed the previous instrumental record of 1937, but was also the warmest in the past 2000 years, following a tree-ring-based temperature reconstruction.🌡️ Make sure to give this very important study by @mikarantane.bsky.social et al. a read!

Excited to share that our new paper “Summer 2024 in northern Fennoscandia was very likely the warmest in 2000 years” has been published in npj Climate and Atmospheric Science! See the open-access paper from doi.org/10.1038/s416... Short thread 👇

Onderzoek van een landgenoot (volgtip) die in 🇫🇮 werkt als klimaatwetenschapper Onderwerp: de waanzinnige warmte in de zomer van 2024 op Spitsbergen - 1.000 km ten noorden van de poolcirkel! Vooral augustus was warm, 11 graden gemiddeld - dat is 2.6 meer dan het vorige record: wat een marge!! 🤪

Hei Bluesky! 👋 Ilmatieteen laitos täällä – säästä, merestä, ilmastosta ja avaruudesta kiinnostuneille. Tervetuloa seuraamaan! 🌦️🌊🌍🛰️ #Sää #Meri #Ilmasto #Avaruus #Tiede

This is what Svalbard's glaciers looked like after last summer/August heatwave. No snow left means: no accumulation zone left. This does not just mean that the glacier will inevitably lose mass — it also means that there's no fresh accumulation to partially offset or slow down that loss.

News article about this publication on the website of the Finnish Meteorological Institute: en.ilmatieteenlaitos.fi/news/7tewlFX... or in Finnish/Suomeksi

📚 Paper alert! 🧪 Thrilled to share my first scientific publication as a first author! "Svalbard's Record‐Breaking Arctic Summer 2024: Anomalies Beyond Climatological Warming Trends" is just out in Geophysical Research Letters, open access. agupubs.onlinelibrary.wiley.com/doi/full/10.... 🧵(1/5)

Currently, temperatures in Helsinki are moving exactly opposite to the typical diurnal cycle: rising 🌡️ during the night, falling 🌡️ during the day. 📉 This is caused by a frontal wave: a warm front moved over Helsinki during the night, and strong cold air advection behind the cold-front just now.

As forecast; it snowed last night, and some of it was still left this morning. ❄️

Helsinki earlier this evening. ❄️