1 Conceptual Model: Rapid Cyclogenesis How to use MSG satellite images similarities to and improvements over MTP Contact person: Veronika Zwatz-Meise Version July 2004

2 CM: Rapid cyclogenesis MTP channels in comparison with the corresponding MSG channels CM Rapid cyclogenesis: IR image + relevant NWP parameters MSG additional channels + Channel combinations (WV and WV difference images)

3 IR sequence Multilevel frontal cloud band Low cloud head at rear side of frontal cloud band Rapid dissolution of cloud at the rear side of the low cloud head Rapid development of spiral structure Development of Cbs at developed cloud spiral

4 MTP: IR/03 UTC As the image time between MTP and MSG differs, a shift between the cloud systems can be noticed in the two images

5 MSG: CH09/03 UTC Sharper contours through improved space resolution; consecutive sequence only from MSG

6 MSG: CH09/06 UTC

7 MSG: CH09/09 UTC

8 MSG: CH09/12 UTC

9 MSG: CH09/15 UTC

10 MSG: CH09/18 UTC

11 WV sequence Dark stripe in WV approaches the cloud head area Dark stripe becomes darker and begins to dissolve cloud at the rear edge of the cloud head area In Ch05 double structure of the dark stripe with different developments visible –Refinement of CM possible ?! Development of a dark area in the spiral center

12 MTP: WV/03 UTC

13 MSG: CH05/03 UTC Sharper contours through improved space resolution; consecutive sequence only from MSG; In MSG two WV channels: Ch05: WV information from high layers

14 MSG: CH05/06 UTC

15 MSG: CH05/09 UTC

16 MSG: CH05/12 UTC

17 MSG: CH05/15 UTC

18 MSG: CH05/18 UTC

19 MSG: CH06/03 UTC In MSG two WV channels Ch06: gives more information from lower layers when comapres Ch05; double structure of black stripes only in last time period resognisable - downward protrusion of dry air

20 MSG: CH06/06 UTC

21 MSG: CH06/09 UTC

22 MSG: CH06/12 UTC

23 MSG: CH06/15 UTC

24 MSG: CH06/18 UTC

25 CM: Rapid Cyclogenesis MTP Satellite images MTP channels in comparison with the corresponding MSG channels CM Rapid cyclogenesis: IR/WV image + relevant NWP parameters MSG additional channels + Channel combinations (WV and WV difference images)

26 Ch09; equ.thickness TFP Frontal characteristics in high gradient of thickness and TFP; high thickness gradient in cloud head area

27 Ch09; TA 700 hpa Frontal characteristics well seen in TA at 700 hPa: WA shield and CA behind CF

28 Ch09; Height contours 1000 hPa Distinct pressure minimum close to the surface (1000 hPa)

29 Ch09; height contours 500 hPa Upper level trough at the rear side of the cloud head

30 Ch09; jet streak 300 hPa Distinct jet streak from N, NW; bending to western orientation; cloud head in exit region

31 Ch09; jet streak PVA 300 hPa Distinct PVA max at 300 hPa in left exit region of the jet streak and in the cloud head area; PVA max close to the jet axis: shear and curvature vorticity

32 Ch09; height of PV = 2 units Stratospheric air (PV =2) down to 600 hPa behind the cloud head; this corresponds to the dark stripe in the WV image

33 Ch05; zeroline of shear vort. 300 hPa CH05: WV in high layers Zeroline of shear vorticity is somewhat on the anticyclonic side of the black stripe

34 Ch06; zeroline of shear vort. 300 hPa CH06: WV in lower layers than in Ch05 Zeroline of shear vorticity is at the boundary between dry and humid air; WV boundary is inclined upward; dry air tilted with height

35 CM: Rapid Cyclogenesis MTP Satellite images MTP channels in comparison with the corresponding MSG channels CM Rapid cyclogenesis: IR image + relevant NWP parameters MSG additional channels + Channel combinations WV and WV difference images

Frontal cloudband: brown:multilayered Cloud head: yellow: low brown: beginning convection and spiral structure

Frontal cloudband: violet: multilayered Cloud head: yellow: low violet: beginning convection and spiral structure