Key Parameters
- Wind vectors or streamlines at 300 and 500 hPa
Wind vectors, preferably streamlines, show the presence of a col (saddle surface) at the area of deformation, with confluence on both sides of the col - Total deformation at 300 and 500 hPa
Total deformation maximum found in the vicinity of the col, with maximum values in the confluent zone on the cold side, where the jet is tightest - Upper/middle tropospheric humidity
High relative humidity gradient at the axis of dilation - Omega at 700 hPa
Weak or moderate sinking motion at, and on the cold side of the deformation zone
Wind/streamlines 300/500 hPa
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28 November 2004/06.00 UTC - Meteosat 8 IR 10.8 image; yellow: streamlines 300 hPa
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Total deformation 300 hPa
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28 November 2004/06.00 UTC - Meteosat IR image; brown: total deformation 300 hPa
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Humidity 500 hPa
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28 November 2004/06.00 UTC - Meteosat 8 WV 6.2 image; blue solid: relative humidity 500 hPa > 70%, blue dashed: relative
humidity 500 hPa < 70%
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Omega 700 hPa
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28 November 2004/06.00 UTC - Meteosat IR 8 10.8 image; yellow solid: sinking motion, yellow dashed: rising motion
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