Transcript Lee and Stau cloud

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
[email protected]
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 two3images
Looks relatively similar;
but: somewhat coarser space resolution
best seen at lee waves
MSG: CH01
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 Ch01
MSG: CH02
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: CH09
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: CH05
Drying by sinking air
at lee side;
no (nearly no) lee cloud
visible; no radiation from
farther below
11
MSG: CH06
In CH06 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)
CH01
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 visibl
CH02
Stau
Lee waves
Snow
22
Stau cloud and lee waves are white to light grey;
snow is darkgrey to black;
lakes are black
CH03
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
CH04
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;
RGB134
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;
RGB139
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;
RGB149
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
RGB321
Stau
Lee waves
Snow
28