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Case of convergence over Gulf of Botnia, Gulf of Finland and lake Vänern Pirkko Pylkkö Finnish Meteorological Institute (See also www.knmi.nl/satrep Satrep Manual). Example of Convergence lines over seas and lakes. Cold air streaming from the north. 22 Oct 2003 0930 UTC

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example of convergence lines over seas and lakes

Case of convergence over Gulf of Botnia, Gulf of Finland and lake Vänern

Pirkko Pylkkö

Finnish Meteorological Institute

(See alsowww.knmi.nl/satrep Satrep Manual)

Example of Convergence lines over seas and lakes
cold air streaming from the north
Cold air streaming from the north
  • 22 Oct 2003 0930 UTC
  • Combination of SEVIRI channels 0.6, 0.8 and 12.0 µm (1,2,10 similar to AVHRR 1,2,4)
  • Polar stereographic projection
  • MSG resolution helps to depict local scale phenomena even in the Nordic countries
  • N.B. there is not much visible light in the north in October, channel 10 (IR12.0) is dominating
slide3

22 Oct 2003 0947 UTC

  • Combination of AVHRR channels 0.6, 0.8 and 12.0 µm
  • Image confirms the findings of previous image and gives more detail
  • Conv. line over Gulf of Finland has drifted towards Estonian coast in the northerly flow
slide4

22 Oct 2003 0930 UTC

  • Combination of SEVIRI channels 0.6,1.6 and 12.0 µm (similar to AVHRR 1,3A,4)
  • Polar stereographic projection
  • Pink colour downstream indicates ice particles
  • In cold climate only clouds with ice particles give rain