Conceptual Models (CMs): Wave - Upper wave

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Conceptual Models (CMs): Wave - Upper wave

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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CM:Wave - Upper wave

• MTP channels in comparison with the corresponding MSG channels

• CM Wave: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• WV and WV difference images

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MTP: ir

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: ch09

Sharper contours throughimproved space resolution

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MTP: vis

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MSG: ch01

Looks relatively similar;but: somewhat coarser space resolution

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MTP:VIS(2x)+IR

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MSG:129

Sharper contours and more detailed grey-shadesthrough improved space resolution in IRand additional information from 2 different VIS channels

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CM:Wave - Upper wave

• MTP channels in comparison with the corresponding MSG channels

• CM Wave: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• WV and WV difference images

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H1000

Upper wave:No or only very weak surface minimum

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H500

Wave and upper wave:Upper level troughat rear side of front

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Equ. Thickness + TFP

Thickness gradient and TFP;transition from Kata to Anatype;TFP at leading edge typical for upper wave

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TFP + TA 700 hPa

Upper wave:CA at 700 hPawithin whole cloud band

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H500 + PVA

Upper level trough at rear side of frontPVA max along as well as above frontal cloud band

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CM:Wave - Upper wave

• MTP channels in comparison with the corresponding MSG channels

• CM Wave: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• WV and WV difference images

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CH03Recognition of water and ice clouds:dark grey: ice cloudswhite: water clouds

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139:The IR ch09 is inverted

4 different colours within upper wave:different cloud layers and stages;best separation between colours

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139 + Shear vorticity 300 hpaJet axis is along the blue stripe at the rear siderepresenting high ice cloud

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MSG:139:The IR ch09 is not invertedbut used as original radiation

Brown: thin cold ice cloudBrown-red:thick,

multilayered cloudYellow: thick water cloud

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CM:Wave - Upper wave

• MTP channels in comparison with the corresponding MSG channels

• CM Wave: IR image + relevant NWP parameters

• MSG additional channels + Channel combinations

• WV and WV difference images

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Ch05

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Ch06

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Ch05

Distinct black stripe only in upper layers

grey area in both levels; darker in the lower layer

No big difference between the two channels:cloud edge

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Example for dry air in lower levels below frontal surface and jet axis

drywet

wetdry

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