Mika Rantanen

@mikarantane

Researcher in Finnish Meteorological Institute (). PhD Student in meteorology in . Studying the dynamics of mid-latitude cyclones.

Helsinki, Suomi
Vrijeme pridruživanja: prosinac 2009.

Tweetovi

Blokirali ste korisnika/cu @mikarantane

Jeste li sigurni da želite vidjeti te tweetove? Time nećete deblokirati korisnika/cu @mikarantane

  1. Prikvačeni tweet
    2. sij

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

    Poništi
  2. prije 7 sati

    January 2020 was globally 1.4°C above the preindustrial level. 1.5°C is not far away.

    Poništi
  3. proslijedio/la je Tweet

    “The lack of snow and the warmth is really unheard of. Monthly records were not just broken, they were shattered with large margins.” - ⁦

    Poništi
  4. prije 14 sati

    This morning's ECMWF deterministic run is flirting with the possibility of 941 hPa pressure in Finland. Finland's all-time lowest pressure is 940.0 hPa on 27 Feb 1990.

    Poništi
  5. prije 16 sati

    Finally, this was the last paper that belongs to my PhD thesis titled "Diagnostic studies of extratropical cyclones in the present and warmer climate". Thanks to Jouni Räisänen, and the other non-twitter co-authors for the help during the process!

    Prikaži ovu nit
    Poništi
  6. prije 16 sati

    This means that the magnitude of vorticity tendencies during the tropical phase were probably underestimated. However, the bias was reduced in the extratropical phase when the horizontal scale of storm increased.

    Prikaži ovu nit
    Poništi
  7. prije 16 sati

    The caveat in our study is related to the small scale of Ophelia during its hurricane phase. model as well as ERA5 reanalysis overestimated the minimum surface pressure of Ophelia by up to 30 hPa when compared to National Hurricane Center analysis.

    Prikaži ovu nit
    Poništi
  8. prije 16 sati

    This shift from convection scheme to microphysics scheme illustrates how the near-core convection transformed into large-scale ascent during the ET of Ophelia.

    Prikaži ovu nit
    Poništi
  9. prije 16 sati

    We discovered that the convection scheme of the model was responsible for the generation of the low-level vorticity at the tropical phase, while the leading forcing in the extratropical phase was the cloud microphysics scheme.

    Prikaži ovu nit
    Poništi
  10. prije 16 sati

    Although Ophelia interacted favorably with the upper-level trough, the direct forcing from baroclinic processes was found to be the very modest for the low-level vortex. Instead, our results show that the adiabatic upper-level forcing was strongly amplified by moist processes.

    Prikaži ovu nit
    Poništi
  11. prije 16 sati

    We analysed the ET of Ophelia using our diagnostic method which decomposes the vertical motion and vorticity tendency into contributions from different adiabatic and diabatic processes. The main tool in this work was the generalized omega equation.

    Prikaži ovu nit
    Poništi
  12. prije 16 sati

    You remember Hurricane Ophelia which underwent spectacular extratropical transition (ET) and hit Ireland as a strong post-tropical storm in October 2017? Our paper about the ET of Ophelia was just published: Thread of the main results below.

    Prikaži ovu nit
    Poništi
  13. proslijedio/la je Tweet
    3. velj

    ECMWF weeklies: 6 straight weeks of -PNA/+NAO/+AO.

    Poništi
  14. proslijedio/la je Tweet

    Incredible warmth in Europe from Scandinavia to western Russia: * : Jan records "shattered" * Moscow's temp in 2020 is averaging 13F above normal & Jan average was above 32F for 1st time * No snow in Jan in Stockholm, Helsinki, and Copenhagen

    Poništi
  15. proslijedio/la je Tweet
    3. velj

    Latest GFS 12z ops run trying to threaten the all time N Atlantic minimum low pressure record (~913mb on 10th Jan 1993 - the ). Suggestions of 917mb near Iceland. Also, still support for widespread gale / severe gale force winds over UK, Tue 11th into Wed 12th Feb

    Prikaži ovu nit
    Poništi
  16. proslijedio/la je Tweet
    3. velj

    An extremely +ve NAM/AO event incoming, projected to peak ~Feb 10th. It is characterised by: (a) an increased poleward height gradient (b) poleward-shifted storm tracks (c) well-separated eddy-driven & sub-tropical jets in the zonal-mean.

    Poništi
  17. 2. velj

    ECMWF predicts 107 hPa pressure difference between the Azores high and the Icelandic low. Extremely positive North Atlantic Oscillation period incoming.

    Poništi
  18. 1. velj

    And yes, Oslo had 3 cm of snow only on the last day of January!

    Prikaži ovu nit
    Poništi
  19. 1. velj

    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.

    Prikaži ovu nit
    Poništi
  20. 1. velj

    Here's the composite image showing the temperature anomaly relative to 1981-2010 climatology, the ranking of the month's average temperature (1.-5.) and stations which set new maximum temperature records.

    Prikaži ovu nit
    Poništi
  21. 1. velj

    There are 77 January months (out of all 176) in the records when even a single day of the month did not reach the _average_ temperature of January 2020.

    Prikaži ovu nit
    Poništi

Čini se da učitavanje traje već neko vrijeme.

Twitter je možda preopterećen ili ima kratkotrajnih poteškoća u radu. Pokušajte ponovno ili potražite dodatne informacije u odjeljku Status Twittera.

    Možda bi vam se svidjelo i ovo:

    ·