Conceptual Models CMs Stau Alps Lee waves Snow

Conceptual Models (CMs): Stau (Alps) Lee waves Snow 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 1

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

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 3 images

Looks relatively similar; but: somewhat coarser space resolution best seen at lee waves MSG: CH 01 Stau Lee waves Snow 4

Looks relatively similar; but: somewhat coarse space resolution best seen at lee waves ; much better recognition of vegetation as in Ch 01 MSG: CH 02 Stau Lee waves Snow 5

MTP: IR Stau Lee waves Snow 6

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: CH 09 Stau Lee waves Snow 7

MTP: IR+VIS Stau Lee waves Snow 8

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 9

MTP: WV Drying by sinking air at lee side 10

MSG: CH 05 Drying by sinking air at lee side; no (nearly no) lee cloud visible; no radiation from farther below 11

MSG: CH 06 In CH 06 are lee waves visible: radiation from lower levels reach the satellite Lee waves 12

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

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

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

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

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 17

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

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

CM: Stau Lee waves Snow • MTP channels in comparison with the corresponding MSG channels • CM Stau: IR image + relevant NWP parameters • MSG additional channels + Channel combinations 20

Stau cloud, lee waves and snow are white; lee waves are partly only grey (thin) CH 01 Stau Lee waves Snow 21

Stau cloud, lee waves and snow are white; lee waves are partly only grey (thin); vegetation structure and lakes clearly visible CH 02 Stau Lee waves Snow 22

Stau cloud and lee waves are white to light grey; snow is darkgrey to black; lakes are black CH 03 Stau Lee waves Snow 23

Interesting is black snow structure; sharp edge for Stau cloud at Alps; black area to the S cold cloud and/or (? ) snow CH 04 Stau Lee waves Snow 24

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; RGB 134 Stau Lee waves Snow 25

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; RGB 139 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; RGB 149 Stau Lee waves Snow 27

Cyan appears at the snow and typically superimposed in the small stripe S of the Alps in Austria; Represents Ice cloud and snow RGB 321 Stau Lee waves Snow 28