Mika Rantanen @mikarantane Twitter profile

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Mika Rantanen

7 days

Our paper "The atmospheric ‘cold blob’ over Fennoscandia from October 2023 to January 2024" was just published in @RMetS Weather! The paper was @IlmaTiede @ACCC_FS collaboration with @OttoHyvarinenIL , @andreavajda3 and Alexey Karpechko.

The atmospheric ‘cold blob’ over Fennoscandia from October 2023 to January 2024

Between October 2023 and January 2024, a persistent region of cold air prevailed over Fennoscandia. While these 4 months were the warmest on record globally, they were all colder than normal in...

rmets.onlinelibrary.wiley.com

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Mika Rantanen

@mikarantane

5 years

Historical chart. There are no known cases in Finland's climate history when it has been hotter than now so early in the summer.

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Mika Rantanen

@mikarantane

4 years

The snow depth in Helsinki Kaisaniemi was still 0 cm today, which means that we have just experienced the first Jan-Feb period on record without any measurable snow in Helsinki. I think that's quite extraordinary.

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Mika Rantanen

@mikarantane

8 months

Here it is, the omega blocking in all its glory, responsible for the annotated extreme weather events in Europe this week.

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Mika Rantanen

@mikarantane

4 years

Gladhammar, Sweden recorded 18.4°C today. This is the highest November temperature ever observed in Sweden, tied with the 1968 record. Historic "heatwave" in Nordic countries.

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Mika Rantanen

@mikarantane

3 years

+17.0°C in Sweden in 𝗙𝗲𝗯𝗿𝘂𝗮𝗿𝘆! Let that sink in. It is the highest temperature ever observed in Sweden in any winter month.

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Mika Rantanen

@mikarantane

2 years

October 2022 is ending with highly anomalous warmth across the whole Europe. Temperatures are widely up to +10 degrees higher than normally this time of the year.

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Mika Rantanen

@mikarantane

4 years

The second largest sea ice decline of the year was observed yesterday: 187,000 km² of ice melted in one day. That's a bit more than half of Finland.

Zack Labe

@ZLabe

4 years

#Arctic sea ice extent has now approached what used to be the average annual minimum in the 1980s... The "melt season" typically ends in early September. [Data from JAXA - small differences will exist between different data sets]

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Mika Rantanen

@mikarantane

2 years

Today and tomorrow will be one of the worst, if not the worst heatwave events in the modern history of western Europe. If you ever can feel the direct impacts of human-induced climate change, it's now.

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Mika Rantanen

@mikarantane

4 years

Incredible heat in Middle East today. These are pretty close the absolute maximum temperatures you can experience anywhere on Earth.

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Mika Rantanen

@mikarantane

4 years

The fastest warming place on Earth, Svalbard, Norway, had just its warmest summer on record, and with a clear margin. This is climate change. More information by @Meteorologisk :

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Mika Rantanen

@mikarantane

4 years

Verhojansk, a Russian town in East Siberia known for its exceptionally cold winters, just broke its all-time heat record with a whopping 38.0°C (100.4°F)! Records kept since 1885. #ArcticHeatwave

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Mika Rantanen

@mikarantane

2 years

A rough sketch of an area with temperatures above 40°C today. Easily over 500 million people in a 40-degree heatwave.

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Mika Rantanen

@mikarantane

4 years

You should never underestimate Siberian summer, but 30.5°C inside Arctic Circle in May feels truly exceptional. #ArcticHeatwave

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Mika Rantanen

@mikarantane

5 years

Tens of millions people in the Western Europe are now probably experiencing the most concrete effect of human-induced climate change during their lifetime so far.

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Mika Rantanen

@mikarantane

4 years

How much faster is the #Arctic warming than the global average? Locally up to 5 times faster, but in general 3-4 times. Inspired by @anttilip and @ClimateOfGavin tweets on this topic.

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Mika Rantanen

@mikarantane

7 months

ERA5 September 2023 monthly data are out. I'm still struggling to comprehend how a single year can jump so much compared to previous years. Just by adding the latest data point, the linear warming trend since 1979 increased by 10%.

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Mika Rantanen

@mikarantane

5 months

Breaking: Malaga airport has just reached 29.4°C, smashing its December heat record by an unprecedented margin. The previous record of 24.6°C (from 1998) was beaten by almost 5 degrees.

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Mika Rantanen

@mikarantane

4 years

Maximum temperatures today in East Siberia. +30°C's in several places within the Arctic circle and not far from the sea ice edge.

Mika Rantanen

@mikarantane

4 years

Another #heatwave will be hitting Arctic this week - this time more in the East Siberia. Siberia in general has been unprecedentedly warm this year, as evidenced earlier by @CopernicusECMWF analysis:

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Mika Rantanen

@mikarantane

4 years

Quite remarkable temperatures in western Siberia today. For example 26.4°C as north as Arctic Circle (66.6°N) and 30.1°C at 62.5°N.

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Mika Rantanen

@mikarantane

2 years

A major heatwave will hit this week to western Europe. Temperatures over 40°C are expected in France and widely in Spain. And this all will happen after a record-warm May in France and the 2nd warmest May in Spain. Some thoughts in a thread 👇

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Mika Rantanen

@mikarantane

2 years

Another GFS run with simply unprecedented heatwave over western Europe: 48°C in France, 43°C in UK... And now at day 7-8 time range. The point here is not that this would be a likely outcome, but rather that a reliable global model can even simulate such a scenario.

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Mika Rantanen

@mikarantane

5 years

I am at the moment at Helsinki Kaisaniemi weather station, which shows temperature of 33.2°C. This the highest temperature ever recorded in the city of Helsinki, in any station. Records began in 1844. #HEATWAVE2019

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Mika Rantanen

@mikarantane

2 years

🚨New paper alert 🚨 I'm excited to announce that our open-access paper "The Arctic has warmed nearly four times faster than the globe since 1979" is now out in @CommsEarth : #ArcticAmplification #Arctic Thread of the main results: 1/13

The Arctic has warmed nearly four times faster than the globe since 1979

Communications Earth & Environment - Over the past four decades, Arctic Amplification - the ratio of Arctic to global warming - has been much stronger than thought, and is probably...

www.nature.com

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Mika Rantanen

@mikarantane

4 years

New all-time heat record for Los Angeles county, California: 121°F = 49.4°C.

NWS Los Angeles

@NWSLosAngeles

4 years

Here are the two sites that broke their all-time high temperature records today. 121° was the highest ever recorded at an official site in L.A. County. Ditto for Paso Robles 117° in San Luis Obispo County. Burbank tied all-time high of 114° from yesterday. #cawx #LAheat #Socal

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Mika Rantanen

@mikarantane

5 months

Next week's Clash of the Titans. Ural High vs. Atlantic Low

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Mika Rantanen

@mikarantane

1 year

There are inversions and then there is this. 32.5°C temperature difference between the valley (-24°C) and the top of the fell (+8.5°C). The stations have a height difference of about 500 meters. Not sure if I have ever seen anything like this.

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Mika Rantanen

@mikarantane

3 years

@GretaThunberg So is Finland. Dec 2019-Nov 2020 period was record-warm and almost 4°C higher than the 1880-1910 average.

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Mika Rantanen

@mikarantane

5 years

Anomalously hot day on the coast of Arctic ocean: Arkhangelsk, Russian just recorded +29°C (at 11.00 UTC). That's only 500 km east of Finnish border. #RussianHeatwave

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Mika Rantanen

@mikarantane

4 years

Extremely anomalous warmth expected near the Arctic Circle in Western Siberia in the coming days. Temperatures can rise 25-30°C higher than normally at this time of the year.

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Mika Rantanen

@mikarantane

3 years

Norwegian meteorological institute @Meteorologisk just announced that 2020 was the warmest year ever recorded in Norway. More information:

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Mika Rantanen

@mikarantane

4 years

Helsinki 🇫🇮 January 2020. First time on record without any snow. First time on record every single day above 0°C. Unprecedented month on many scales.

Erik Solheim

@ErikSolheim

4 years

Oslo 🇳🇴 January 2020. Climate change. Not one day below 0 C. Not one snowflake the entire month. Noone can remember a January in Oslo like this. Its first time ever.

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Mika Rantanen

@mikarantane

1 year

Global sea surface temperatures just reached uncharted territory in modern records and likely much longer. And El Nino is developing later this year.

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Mika Rantanen

@mikarantane

4 years

Longyearbyen, Svalbard, which is the fastest warming place on Earth, hits 21.7°C (71.1°F) which the new all-time heat record of the place (78°N). Another new record for the remarkable summer 2020 in the Arctic.

Torsten Hanssen

@VaerTorsten

4 years

BREAKING: The temperature in Longyearbyen reached 21.7 C at 18:00 saturday afternoon, a new all time heat record. Old record 21.3 C 16.7 1979

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Mika Rantanen

@mikarantane

11 months

NOAA's Marine Heatwave Watch has classified the North Atlantic marine heatwave locally up to a Category 5 (Beyond Extreme) west of Ireland. More widely a Category 4 event.

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Mika Rantanen

@mikarantane

4 years

The first 10 months of the year have been up to 7°C warmer than normal in northern Siberia. That is a huge anomaly for such a long stretch of time.

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Mika Rantanen

@mikarantane

3 years

Extreme heat in the Arctic Finland: Utsjoki Kevo just recorded 33.5°C (92.3°F), which is not only the station's new all-time heat record, but also the highest reliably measured temperature ever in the whole Finnish Lapland. ☀️🌡️🚨

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Mika Rantanen

@mikarantane

3 years

Tänään, tiettävästi ensimmäistä kertaa millään suomalaisella sääasemalla, mitattiin samana päivänä #helle 'ttä ja lunta. Se tapahtui Suomussalmen Pesiöllä, missä iltapäivän ylin lämpötila oli 25.1°C. Aamulla sääaseman mittarissa oli vielä 15 cm lunta.

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Mika Rantanen

@mikarantane

2 years

While the 5th highest surface temperatures are certainly an important indicator of climate change, the record-high ocean heat content is still probably better manifestation of unabated global warming in 2021.

Lijing Cheng

@Lijing_Cheng

2 years

[1/9] OHC (0-2000m) hits record high in 2021, again, despite La Niña Conditions! The most recent report, authored by 23 researchers at 14 institutes, was published in Advances in Atmospheric Sciences.

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Mika Rantanen

@mikarantane

5 years

The #Heatwave in Finland is nearing the end today, but still over 30°C inside Arctic circle (Russia) and 31°C at the coast of the White Sea.

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Mika Rantanen

@mikarantane

4 years

Europe is under #heatwave . Increasing trends of heatwaves due to global warming is one of the most established fact in the climate change attribution studies. This is how much hot days (Tmax > 30°C) have increased in Europe in 1961-2019:

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Mika Rantanen

@mikarantane

4 years

According to @JAXA_en /AMSR2 satellite data, Arctic sea ice extent has fallen below 2016 and 2019 minimums, so at least the 2nd lowest minimum is now reality.

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Mika Rantanen

@mikarantane

4 years

If you live in Helsinki, you have just lived the warmest 365 days of your life.

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Mika Rantanen

@mikarantane

4 years

The extreme heat in Siberia has been arguably the most remarkable weather event in the world by far in 2020. According to the latest ERA5 data, some places have been 8°C warmer than normal during the first half of the year.

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Mika Rantanen

@mikarantane

2 years

Wonderful image of Finland in this unusual early-winter cold wave. 🇫🇮❄️

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Mika Rantanen

@mikarantane

2 years

There is a heatwave in the Arctic as well. Norilsk, a city known for its infamous oil spill disaster in 2020, set today a new June heat record with 32.0°C (89.6°F).

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Mika Rantanen

@mikarantane

2 years

This warm circulation pattern, which has lasted for the 2/3 of October, is likely to prevail until the end of the month. As a result, there is a good chance that October 2022 will go down in history as the warmest October in Europe.

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Mika Rantanen

@mikarantane

2 years

A decent late-summer heatwave will establish northeastern Europe this week. 30°C is possible in Finland. 30°C in Finland this late in summer (after 15 Aug) is very rare: in the modern daily temperature data (1959 to present), it has only happened in the summer 1959.

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Mika Rantanen

@mikarantane

4 years

Happy to announce that I succesfully defended my PhD today! #PhDone

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Mika Rantanen

@mikarantane

5 months

The last two months have been exceptionally warm in the northern hemisphere - except for northern Europe.

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Mika Rantanen

@mikarantane

2 years

At 14.00 Finnish time, the maximum temperature in Finland was 31.1°C - the highest ever recorded in Finland after mid-August. Temperatures are still rising.

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Mika Rantanen

@mikarantane

1 year

Wow. Spectacular satellite photo of sunny and snowy Finland today. ❄️☀️ Download the high-res image from here:

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Mika Rantanen

@mikarantane

4 years

For the first time on record, we had January when Oslo, Stockholm, Helsinki and Copenhagen were above freezing (0°C) every day of the month. In addition, all but Oslo were totally snow-free. Satellite image on 22 Jan 2020.

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Mika Rantanen

@mikarantane

2 years

30,000 ground flashes today. The most lightning strikes in one day in Finland during the 21st century.

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Mika Rantanen

@mikarantane

2 years

Wow! The cold front in the southern coast of Finland just produced wind gust of 39.2 m/s (88 mph) in Hanko Russarö. If valid reading, it's one of the strongest wind gusts ever recorded in Finland.

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Mika Rantanen

@mikarantane

3 years

Between 1959 and 2002, 33°C was reached only twice in Finland. Now, this was the 4th year in a row with 33°C. As if something has changed?

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Mika Rantanen

@mikarantane

2 years

The shockwave caused by #TongaVolcano has now reached Helsinki, Finland.

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Mika Rantanen

@mikarantane

1 year

Unprecedented warmth in Europe just at the turn of the year. In some places, both the December and January heat records can be broken within a few hours. And those heat records might be from the last New Year, which was also record-breaking.

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Mika Rantanen

@mikarantane

4 months

#Pakkanen puhuttaa. Miten meneillään oleva pakkasjakso sopii yhteen #ilmasto 'n lämpenemisen kanssa? ❄️🌨️🥶 Muutama ajatus pitkähkössä ketjussa 👇🧵: (1/13)

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Mika Rantanen

@mikarantane

3 years

It's official. 2020 was the warmest year ever recorded in Finland. Finnish Meteorological Institute @ilmatiede press release:

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Mika Rantanen

@mikarantane

2 years

Southern Finland on this bright January day as seen from space. ☀️☀️ Lots of open water due to the recent mild and stormy weather.

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Mika Rantanen

@mikarantane

2 years

Hot week coming for most of Europe, again. August 2022, and thus the whole summer of 2022 are probably ending up being the hottest on record in Europe.

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Mika Rantanen

@mikarantane

2 years

Breaking: Finland's northernmost weather station Utsjoki Nuorgam (70°N) set a new June heat record. Temperature was 30.6°C at 12.20 local time, which exceeds the previous record of 30.5°C on 15.6.1974. Temperature is still rising. The final Tmax will be announced later.

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Mika Rantanen

@mikarantane

3 years

28.1°C was just observed in Oulu, Finland. This is the earliest 28°C recorded in Finland during 1959-2020 (which is time period of available daily data).

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Mika Rantanen

@mikarantane

6 months

The newest ECMWF forecast indicates record-high global mean temperature anomaly next week. About 1.94 °C above 1850-1900 reference level.

Mika Rantanen

@mikarantane

6 months

Plot showing the global mean temperature anomaly (relative to 1850-1900) from which the forecast spike can be better visualized.

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Mika Rantanen

@mikarantane

4 months

The Bothnian Bay is now completely frozen. The last time the bay froze this early was in winter 2011. The ice cover in the Baltic Sea is now the widest it has been in 13 years - the last winters with more ice at this time of year were 2010 and 2011.

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Mika Rantanen

@mikarantane

11 months

Global mean temperatures in the first half of June. Uups.

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Mika Rantanen

@mikarantane

3 years

Bang! -40°C in Finland! Utsjoki Kevo just recorded -40.1°C. The last time we've had -40°C in December was 2002, but this is still far from the monthly record for December which is -47.0°C.

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Mika Rantanen

@mikarantane

4 years

Already 23.2°C and possibly still rising in Kokemäki! Very unusual heat going on in Finland.

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Mika Rantanen

@mikarantane

1 year

Last weekend, the November heat record was crushed in Helsinki, Finland with a value of 14.3°C. The 179-year temperature record from Kaisaniemi weather station shows a clear uptick in the 21st century. As if something is happening to our Novembers? #HockeyStick

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Mika Rantanen

@mikarantane

4 years

The final maximum temperature today was 33.5°C. This is the highest June temperature observed in Finland for at least 81 years. #heatwave

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Mika Rantanen

@mikarantane

1 year

Lots of presentations this week in #EGU23 about record-shattering heat extremes by @erichfischer and many others. The new April heat record in Cordoba airport just demonstrates the nature of these events: the records are not just broken, they are shattered.

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Mika Rantanen

@mikarantane

5 months

Next week will be a good example of how, despite record global warmth, it can still be very cold locally. To be honest, it's been a while since the ECMWF weekly forecast showed the lowest colour scale for Finland (more than 10°C below normal).

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Mika Rantanen

@mikarantane

3 months

Uunituoretta tietoa AMOC:in eli Atlantin meridionaalisen kiertoliikkeen heikkenemisestä: Jos keikahduspiste saavutetaan (AMOC pysähtyy), Skandinaviassa koittaa kylmät oltavat. Bergenissä helmikuun keskilämpötila romahtaa 35 astetta sadassa vuodessa!

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Mika Rantanen

@mikarantane

5 years

It's been crazy warm week in Europe. The monthly February records have been broken in at least nine countries. Without #climatechange and our already warmed climate this would have been extremely unlikely to happen. Background map from

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Mika Rantanen

@mikarantane

26 days

365-day running mean global temperature anomaly from ERA5 reached just a new decimal: 1.6°C above the 1850-1900 pre-industrial average.

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Mika Rantanen

@mikarantane

9 months

Spain's 3rd largest city, Valencia, just broke it's all-time temperature record with a huge margin. The new record, which stands now at 46.8°C, surpasses the previous record of 43.4°C by a whopping 3.4 degrees.

AEMET_C. Valenciana

@AEMET_CValencia

9 months

DATO OFICIAL | 46.8 ºC en el aeropuerto de València. Récord histórico en este observatorio superando los los 43.4 del 6 de julio de 1986. Está llegando la brisa y comienza a descender ligeramente.

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Mika Rantanen

@mikarantane

3 years

What is the longest cold front you've ever seen? How about this one from the Norwegian coast to Tenerife.

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Mika Rantanen

@mikarantane

3 years

"Jos Suomessa oli kuuma kesä vuonna 1937, oli se hyvin yksittäinen poikkeustapaus viileällä maapallolla." Vertaa kesiä 1937 ja 2020 globaalisti. On siinä pieni ero.

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Mika Rantanen

@mikarantane

2 years

The North Atlantic is currently record-warm. This can help potential recurving tropical cyclones to maintain their strength while approaching Europe.

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Mika Rantanen

@mikarantane

3 years

The numbers are in. Meteorological summer in #Helsinki was the hottest ever recorded: 18.9°C. 🌡️🚨 This breaks the previous record from 2018 by 0.6°C. Records have been kept since 1845.

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Mika Rantanen

@mikarantane

11 months

Although ERA5 is still missing a week of data, it is already clear that June 2023 will not break the record for the hottest June by a small margin, but by a large margin.

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Mika Rantanen

@mikarantane

2 months

Pretty unusual trumpet-shaped (or v-shaped) light pillars in Helsinki on Thursday. I have never seen anything like these before. Photos by @pmakipetaja . Source:

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Mika Rantanen

@mikarantane

3 years

Can we talk about this forecasted temperature gradient for eastern Europe?

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Mika Rantanen

@mikarantane

5 months

Helsinki has been now below zero (0°C) for an impressive 21 consecutive days, i.e. since 25 November. This long frosty spell will be broken tomorrow. Such a long period of frost this early in the winter is very unusual 👇

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Mika Rantanen

@mikarantane

2 years

Classic omega-shaped blocking seems increasingly likely next week and beyond. This would mean even more this kind of beautiful and sunny late winter / early spring days as now. ☀️

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Mika Rantanen

@mikarantane

4 years

This is probably the most incredible temperature change which I've ever seen in the forecasts. Everything is bigger in America!

Bob Henson

@bhensonweather

4 years

Ahh, Denver...

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Mika Rantanen

@mikarantane

4 months

Update: Enontekiö Airport has just dropped to 43.7°C, making today the coldest day in Finland this century.

Mika Rantanen

@mikarantane

4 months

Here we go. The anticipated -40°C mark was also reached in Finland last night. Enontekiö airport recorded -42.3°C at 6.21 UTC, the coldest January temperature in Finland since 2006.

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Mika Rantanen

@mikarantane

7 months

It's official: September was by far the warmest September at Finland's longest operating weather station, Helsinki Kaisaniemi: 15.8°C 🌡️🚨 The reading beats the previous record set in 1934 (14.9°C) by almost one degree.

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Mika Rantanen

@mikarantane

1 year

The recent uptick in global sea surface temperatures (SST) produced the all-time highest monthly SST anomaly in April 2023 (for any month!). It looks like El Niño event even though we are still in a neutral situation and the actual El Niño is just emerging.

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Mika Rantanen

@mikarantane

2 years

Incredibly warm (and moist) night behind. Helsinki Kaisaniemi did not drop below 21.7°C. Tropical nights in Helsinki after mid-August are very rare, and this was by far the highest minimum temperature (provided it lasts until 18 UTC).

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Mika Rantanen

@mikarantane

2 years

Just in time! Every single snow-measuring weather station reported snow on #ChristmasEve . Last time this happened in 2018.

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Mika Rantanen

@mikarantane

2 years

The first week of December was the coldest in 84 years in Helsinki.

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Mika Rantanen

@mikarantane

3 years

Once more about the extreme heat in the Arctic Fennoscandia today: 34.3°C Banak, the coast of Porsangerfjorden, Norway 🇳🇴 30.8°C Makkaur Lighthouse, the coast of Arctic ocean, Norway 🇳🇴 33.4°C Tanabru, Norway 🇳🇴 33.6°C Utsjoki Kevo, Finland 🇫🇮

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Mika Rantanen

@mikarantane

4 months

Ensinnäkin, globaalia ilmaston tilaa ei saa selville vain takapihalle tuijottamalla tai paikallisia säätilastoja tutkimalla. Suomi on ollut pohjoisen pallonpuoliskon kylmyyspiste viimeisen kuukausien aikana. (2/13)

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Mika Rantanen

@mikarantane

2 years

Now, after two years of work here in FMI, I just signed a permanent employment contract 🤩 Unfortunately, a permanent contract is a privilege and luxury in research.

Mika Rantanen

@mikarantane

4 years

Personal news: I have started as a researcher in Finnish Meteorological Institute ( @IlmaTiede ) today. I will be working with topics related to #ClimateChange and extreme weather, such as #windstorm 's in Finland.

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Mika Rantanen

@mikarantane

8 months

Lots of extreme weather in Europe this week due to a well-developed Omega-blocking high pressure. The blocking will be sandwiched in between two cut-off lows to the east and west.

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Mika Rantanen

@mikarantane

3 years

The circulation patterns in the Northern Hemisphere last February and this February. Like mirror images!

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Mika Rantanen

@mikarantane

6 months

During the next 24 hours, the area of the coldest lower tropospheric air mass (T850 -19 °C) will move westwards over Finland. Parts of the country are experiencing the coldest November temperatures since the famous November 2010 cold spell.

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Mika Rantanen

@mikarantane

6 years

Massive burst of chaffinch migration seen by the weather radars today morning. The start of the migration follows the sunrise from east to west. #autumnmigration #syysmuutto

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Mika Rantanen

@mikarantane

5 years

-38.7°C measured in Sodankylä today is now the lowest temperature recorded in Finland and apparently in the whole Europe (excl. Russia) in winter 2018/2019. I believe that -40°C will be broken tonight.

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