Transcript CM: Rapid Cyclogenesis

Conceptual Model:
Rapid Cyclogenesis
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
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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)
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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
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MTP: IR/03 UTC
As the image time between MTP and MSG differs, a shift between the cloud systems can be noticed in the two4images
MSG: CH09/03 UTC
Sharper contours through
improved space resolution;
consecutive sequence only from MSG
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MSG: CH09/06 UTC
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MSG: CH09/09 UTC
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MSG: CH09/12 UTC
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MSG: CH09/15 UTC
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MSG: CH09/18 UTC
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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
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MTP: WV/03 UTC
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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
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MSG: CH05/06 UTC
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MSG: CH05/09 UTC
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MSG: CH05/12 UTC
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MSG: CH05/15 UTC
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MSG: CH05/18 UTC
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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
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MSG: CH06/06 UTC
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MSG: CH06/09 UTC
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MSG: CH06/12 UTC
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MSG: CH06/15 UTC
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MSG: CH06/18 UTC
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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)
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Ch09;
equ.thickness
TFP
Frontal characteristics in
high gradient of thickness and TFP;
high thickness gradient in cloud head area
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Ch09;
TA 700 hpa
Frontal characteristics well seen in
TA at 700 hPa:
WA shield and CA behind CF
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Ch09;
Height contours
1000 hPa
Distinct pressure minimum
close to the surface
(1000 hPa)
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Ch09;
height contours
500 hPa
Upper level trough at the rear side
of the cloud head
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Ch09;
jet streak
300 hPa
Distinct jet streak from N, NW;
bending to western orientation;
cloud head in exit region
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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 vorticity31
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
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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
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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
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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
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139:
The IR ch09 is inverted
Frontal cloudband:
violet: multilayered
Cloud head:
The two black stripes from
WV channel 05 are an indication for the
double structure in the convective part
of the cloud head
yellow: low
violet: beginning convection and
spiral structure
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MSG:139:
The IR ch09 is not inverted
but used as original radiation
The two black stripes from
WV channel 05 are an indication for the
double structure in the convective part
of the cloud head
Brown: thin cold ice cloud
Brown-red:thick,
multilayered cloud
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Yellow: thick water cloud
134
Frontal cloudband:
brown:multilayered
Cloud head:
The two black stripes from
WV channel 05 are an indication for the
double structure in the convective part
of the cloud head
yellow: low
brown: beginning convection and
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spiral structure