Typical Appearance In Vertical Cross Sections
- Temperature Advection (TA): The asymmetry of the thermal structure intensifies due to negative temperature advection in the western sector of the cyclone and positive advection in the eastern sector (see image below), at low and upper levels during the cyclogenesis and mature stages.
- Vorticity Advection (NVA/PVA): Relative Upper-level NVA (PVA) can be seen in the eastern (western) sector of the cyclone.
- Potential Vorticity (PV): This variable shows an intrusion into the troposphere reaching as far as 330 hPa during the cyclogenesis stage at 00Z on 08 September, 2009, around 57°W and as far as 500 hPa during the mature stage at 06Z on 09 September, 2009 near 42°W.
- Relative Humidity (RH): In the cyclogenesis stage, the mid-level atmosphere is dry. During the mature stage, we see a dry tongue with low relative humidity values near 42°W.
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8 September, 2009, 00 UTC. Cross section location on left. On right Vertical Cross Sections along the line A-A' (near the dry intrusion) of Temperature Advection, Potential Vorticity, Vorticity Advection and Relative Humidity.
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9 September, 2009, 06 UTC. Cross section location on left. On right Vertical Cross Sections along the line A-A' (near the dry intrusion) of Temperature Advection, Potential Vorticity, Vorticity Advection and Relative Humidity.
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