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

Snow

How to use MSG satellite images

similarities to and improvements

over MTP

Contact person:Veronika Zwatz-Meisezwatz-meise@zamg.ac.atVersion 1.0. 13 July 2004

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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

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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

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MSG: CH01

Stau

Lee waves

Snow

Looks relatively similar;but: somewhat coarser space resolutionbest seen at lee waves

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MSG: CH02

Stau

Lee waves

Snow

Looks relatively similar;but: somewhat coarse space resolutionbest seen at lee waves ;much better recognition of vegetationas in Ch01

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MTP: IR

Stau

Lee waves

Snow

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MSG: CH09

Stau

Lee waves

Snow

Sharper contours throughimproved space resolution;especially well seen at lee waves;lee waves are better discernable in IR;relative high, cold cloud tops ?

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MTP: IR+VIS

Stau

Lee waves

Snow

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MSG: 129

Stau

Lee waves

Snow

Sharper contours and more detailed grey-shadesthrough improved space resolution in IR and additional information from 2 different VIS channels;less resolution for lee waves from the VIS channels

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MTP: WV

Drying by sinking airat lee side

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MSG: CH05

Drying by sinking airat lee side; no (nearly no) lee cloud visible; no radiation fromfarther below

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MSG: CH06

Lee waves

In CH06 are lee waves visible:radiation from lower levels reachthe satellite

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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

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Stau

Lee waves

Snow

Surface high pressure approachesthe Alps from SW;Stau as well as lee waves appearin N stream

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Stau

Lee waves

Snow

Upper level trough; Stau as well as lee wavesappear in NW stream

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Stau

Lee waves

Snow

Wind vectors at 850 hpa Stau within W stream at 850;lee within NW stream at 850

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Stau

Lee waves

Snow

Wind vectors at 700 hpa Stau within NW stream at 700;lee within NW stream at 700;wind turns to more NW directions

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Stau

Lee waves

Snow

Wind vectors at 500 hpa Stau within NW stream at 500;lee within NW stream at 500;wind speed is strong in all three levels

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Stau

Lee waves

Snow

Thickness + TFP Stau and lee waveswithin thickness trough

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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

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CH01

Stau

Lee waves

Snow

Stau cloud, lee waves and snow are white;lee waves are partly only grey (thin)

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CH02

Stau

Lee waves

Snow

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

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CH03

Stau

Lee waves

Snow

Stau cloud and lee waves are white to light grey;snow is darkgrey to black;lakes are black

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CH04

Stau

Lee waves

Snow

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

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RGB134

Stau

Lee waves

Snow

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 bettervisible as from single channels;

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RGB139

Stau

Lee waves

Snow

Interesting is snow structure; pink at W-Alps where there is snow;small stripe S of Alps in Austria has other colourseems to be high cloud;sharp edge for Stau cloud at Alps much bettervisible as from single channels;

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RGB149

Stau

Lee waves

Snow

Interesting is snow structure; pink at W-Alps where there is snow;small stripe S of Alps in Austria has other colourseems to be high cloud;sharp edge for Stau cloud at Alps much bettervisible as from single channels;

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RGB321

Stau

Lee waves

Snow

Cyan appears at the snow and typicallysuperimposed in the small stripe S of theAlps in Austria; Represents Ice cloud and snow