Conceptual Models (CMs): Cold fronts (CF), Ana- and Katatype

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1

Conceptual Models (CMs):

Cold fronts (CF),

Ana
-

and Katatype

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:

Cold Fronts

(Ana
-
and Katatype)



MTP channels in comparison with the
corresponding MSG channels


CM Cold Fronts: IR image + relevant NWP parameters


MSG additional channels + Channel combinations


(WV and WV difference images)

3

CM: Cold Fronts


Typical Anacoldfront

4

MTP: ir

CF

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

Sharper contours through

improved space resolution

CF

Grey: warm

cloud tops

White: cold

cloud tops

6

MSG: Ch10

Visual inspection shows


only very slight changes

between Ch09 and Ch10;

quantitative evaluation

necessary

CF

7

MTP: vis

CF

8

Looks relatively similar;

but: somewhat coarser space resolution

MSG: Ch01

White: high

albedo

CF

Grey:

transparent

9

MSG: Ch02

Compared to Ch01:

no strong differences in the cloud

features over the ocean;

but: much better land recognition

CF

10

MTP:VIS(2x)+IR

CF

11

MSG:129

Sharper contours and more detailed grey
-
shades

through improved space resolution in IR and

additional information from 2 different VIS channels

CF

White/grey/blue:

multilevel

blue:

high

12

CM: Cold Fronts


Typical Katacoldfront

13

MTP: ir

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

in IR detectable only from

general structure

14

MSG: Ch09

Sharper contours through

improved space resolution

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

in IR detectable only from

general structure

15

MTP: vis

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

in vis differentiation between thick

and transparent cloud parts possible

16

MSG: Ch01

Looks relatively similar;

but: somewhat coarser space resolution

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

in vis differentiation between thick

and transparent cloud parts possible

17

MSG: Ch02

Compared to Ch01:

no strong differences in the cloud

features over the ocean;

but: much better land recognition

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

in vis differentiation between thick

and transparent cloud parts possible

18

MTP:VIS(2x)+IR

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

blue: high cloud on anticyclonic

jet side

grey: thick cloud parts

19

MSG:129

Sharper contours and more detailed grey
-
shades

through improved space resolution in IR and

additional information from 2 different VIS channels

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

blue: high cloud on anticyclonic

jet side

grey: thick cloud parts

line of lower cloud cells

discernable

20

MTP: wv

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

jet axis through dark stripe

well recognisable

21

MSG: Ch05

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

jet axis through dark stripe

well recognisable

22

MSG: Ch06

CF

CF

Typical intensification

of front cloud on cyclonic

side of a crossing jet streak;

Ch06:

Signals from much lower down

in tropopshere;

black stripe crossing frontal

cloud band less good but

still recognisable

23

CMs:

Coldfronts

(Ana
-

and Katatype)


MTP channels in comparison with the corresponding MSG channels


CM Coldfronts: IR image + relevant NWP
parameters


MSG additional channels + Channel combinations


(WV and WV difference images)

24

CM: Cold Fronts


Typical Anacoldfront

25

Thickness (green)+

TFP (blue)

High gradient of thickness at

rearward edge of frontal cloud band;

TFP close to the leading edge

of the frontal cloud band

26

Thickness (green) + TA (red)

Zeroline of TA close to rearward

edge of frontal cloud band;

CA at 700 within biggest part

of frontal cloud

CA

27

Isotachs 300

Jetaxis and jet streak along

rearward side of frontal cloud band

28

MSG: Ch05

zeroline of shear vort 300 (yellow)

Zeroline of shear vorticity 300

(jetaxis) fits to transition from

wet to dry

29

Zeroline of shear vorticity 300

(jetaxis) fits to transition from

wet to dry;

no tilt between Ch05 and 06

recognisable

MSG: Ch06

zeroline of shear vort 300 (yellow)

30

MSG:139

zeroline of shear vort. 300 (black)

Zeroline of shear vorticity 300

(jetaxis) fits to the margenta

fibre at the rear of the cloud band;

high cold tops consisting of ice

31

CM: Cold Fronts


Typical Katacoldfront

32

Thickness (green)+

TFP (blue)

High thickness gradient and TFP

close to rear side of frontal

cloud band as well as

in the intensification area;

33

TA (red)

Main part of the frontal

cloud band is under WA at 700

34

Isotachs (yellow) + PVA (red) at 300

A jet streak crosses the

front at the N
-
S oriented part;

the intensification area is

under strong PVA in the left

exit region of the jet streak

PVA max

35

MSG: Ch09

zeroline of shear vort 300 (black)

The jet axis (zeroline of

shear vort. At 300) crosses the

cloud band at the N
-
S oriented part

36

MSG: Ch05

zeroline of shear vort 300 (black)

The jet axis (zeroline of

shear vort. at 300) is close to

the dark stripe in WV

37

MSG: Ch06

zeroline of shear vort 300 (black)

The jet axis (zeroline of

shear vort. at 300) is close to

the dark stripe in WV;

but: it is drier than in the

upper WV channel; some

tilt between Ch05 and Ch06

38

CMs:

Coldfronts

(Ana
-

and Katatype)


MTP channels in comparison with the corresponding MSG channels


CM Cold Fronts: IR image + relevant NWP parameters


MSG additional channels + Channel
combinations



(WV and WV difference images)

39

CM: Cold Fronts


Typical Anacoldfront

40

CF

MSG:129

For reasons of comparison with

analoge RGBs fron NOAA

the IR ch09 is inverted

Yellow/grey/blue:

multilayered;

transparent cold cloud

line at the rearward edge

41

CF

MSG: Ch03

Ice clouds are superimposed

on water clouds;

line of ice clouds along rearward

edge of frontal cloud band

42

CF

MSG:321

Grey shades: from Vis channels

Cyan:

represents the ice clouds

from Ch03: line of ice clouds

along rearward

edge of frontal cloud band

43

CF

MSG:139:

The IR ch09 is inverted

Blue: cold transparent cloud

Magenta: ice cloud

line of ice cloud along

rearward edge

44

MSG:139:

The IR ch09 is not inverted

but used as original radiation

Brown: thin cold ice cloud

Brown
-
red:thick,


multilayered cloud

Yellow: thick water cloud

CF

45

CF

MSG:134

Brown/orange:

cold cloud top;

ice cloud

46

CM: Cold Fronts


Typical Katacoldfront

47

MSG:129:

For reasons of comparison with

analoge RGBs fron NOAA

the IR ch09 is inverted

Yellow/grey/blue:

multilayered;

transparent cold cloud;

thick cloud in the

intensification area

48

MSG: Ch03

Ice clouds are superimposed

on water clouds;

intensification area consists

of ice and water cloud

49

MSG: Ch03

Ice clouds are superimposed

on water clouds;

intensification area consists

of ice and water cloud

50

MSG:321

Grey shades: from Vis channels

Cyan:

represents the ice clouds

from Ch03:

intensification area shows ice on top

of water cloud

51

MSG:139:

The IR ch09 is inverted

Blue: cold transparent cloud

Magenta: ice cloud

intensification area is magenta

52

MSG:139:

The IR ch09 is not inverted

but used as original radiation

Brown: thin cold ice cloud

Brown
-
red:thick,


multilayered cloud

Yellow: thick water cloud

53

MSG:134

Brown/orange:

cold cloud top;

ice cloud;

intensification area is

brown structured