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Analyzing Stau and Lee Waves in the Alps: MSG Satellite Image Comparison

This document discusses the use of MSG satellite images to analyze Stau and Lee waves in the Alps, emphasizing significant improvements over traditional MTP channels. It highlights the similarities and differences of various MSG and MTP channels, focusing on their capabilities to capture various meteorological phenomena such as snow and vegetation. Informative comparisons are made using IR images and relevant NWP parameters, demonstrating enhanced spatial resolution and improved visibility of these features, particularly in IR channel imagery.

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Analyzing Stau and Lee Waves in the Alps: MSG Satellite Image Comparison

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  1. Conceptual Models (CMs): Stau (Alps)Lee wavesSnow How to use MSG satellite images similarities to and improvements over MTP Contact person: Veronika Zwatz-Meise zwatz-meise@zamg.ac.at Version 1.0. 13 July 2004

  2. CMs:Stau (Alps) Lee wavesSnow • MTP channels in comparison with the corresponding MSG channels • CM Stau: IR image + relevant NWP parameters • MSG additional channels + Channel combinations

  3. MTP: VIS Stau Lee waves Snow As the image time between MTP and MSG differs, a shift between the cloud systems can be noticed in the two images

  4. Looks relatively similar; but: somewhat coarser space resolution best seen at lee waves MSG: CH01 Stau Lee waves Snow

  5. Looks relatively similar; but: somewhat coarse space resolution best seen at lee waves ; much better recognition of vegetation as in Ch01 MSG: CH02 Stau Lee waves Snow

  6. MTP: IR Stau Lee waves Snow

  7. Sharper contours through improved space resolution; especially well seen at lee waves; lee waves are better discernable in IR; relative high, cold cloud tops ? MSG: CH09 Stau Lee waves Snow

  8. MTP: IR+VIS Stau Lee waves Snow

  9. Sharper contours and more detailed grey-shades through improved space resolution in IR and additional information from 2 different VIS channels; less resolution for lee waves from the VIS channels MSG: 129 Stau Lee waves Snow

  10. MTP: WV Drying by sinking air at lee side

  11. MSG: CH05 Drying by sinking air at lee side; no (nearly no) lee cloud visible; no radiation from farther below

  12. In CH06 are lee waves visible: radiation from lower levels reach the satellite MSG: CH06 Lee waves

  13. CMs:Stau Lee wavesSnow • MTP channels in comparison with the corresponding MSG channels • CM Stau: IR image + relevant NWP parameters • MSG additional channels + Channel combinations

  14. Surface high pressure approaches the Alps from SW;Stau as well as lee waves appear in N stream Stau Lee waves Snow

  15. Upper level trough; Stau as well as lee waves appear in NW stream Stau Lee waves Snow

  16. Stau within W stream at 850; lee within NW stream at 850 Wind vectors at 850 hpa Stau Lee waves Snow

  17. Stau within NW stream at 700; lee within NW stream at 700; wind turns to more NW directions Wind vectors at 700 hpa Stau Lee waves Snow

  18. Stau within NW stream at 500; lee within NW stream at 500; wind speed is strong in all three levels Wind vectors at 500 hpa Stau Lee waves Snow

  19. Thickness + TFP Stau and lee waves within thickness trough Stau Lee waves Snow

  20. CM:StauLee wavesSnow • MTP channels in comparison with the corresponding MSG channels • CM Stau: IR image + relevant NWP parameters • MSG additional channels + Channel combinations

  21. Stau cloud, lee waves and snow are white; lee waves are partly only grey (thin) CH01 Stau Lee waves Snow

  22. Stau cloud, lee waves and snow are white; lee waves are partly only grey (thin); vegetation structure and lakes clearly visible CH02 Stau Lee waves Snow

  23. Stau cloud and lee waves are white to light grey; snow is darkgrey to black; lakes are black CH03 Stau Lee waves Snow

  24. Interesting is black snow structure; sharp edge for Stau cloud at Alps; black area to the S cold cloud and/or (?) snow CH04 Stau Lee waves Snow

  25. Interesting is snow structure; brown at W-Alps where there is snow and small stripe S of Alps in Austria; are both snow ? sharp edge for Stau cloud at Alps much better visible as from single channels; RGB134 Stau Lee waves Snow

  26. Interesting is snow structure; pink at W-Alps where there is snow; small stripe S of Alps in Austria has other colour seems to be high cloud; sharp edge for Stau cloud at Alps much better visible as from single channels; RGB139 Stau Lee waves Snow

  27. Interesting is snow structure; pink at W-Alps where there is snow; small stripe S of Alps in Austria has other colour seems to be high cloud; sharp edge for Stau cloud at Alps much better visible as from single channels; RGB149 Stau Lee waves Snow

  28. Cyan appears at the snow and typically superimposed in the small stripe S of the Alps in Austria; Represents Ice cloud and snow RGB321 Stau Lee waves Snow

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