by ZAMG
19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), red thin: temperature advection - CA, red thick: temperature
advection - WA, orange thin: IR pixel values, orange thick: WV pixel values
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19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), blue: relative humidity, orange thin: IR pixel values, orange
thick: WV pixel values
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19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), yellow: isotachs, orange thin: IR pixel values, orange thick: WV
pixel values
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19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), green thick: vorticity advection - PVA, green thin: vorticity
advection - NVA, orange thin: IR pixel values, orange thick: WV pixel values
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The IR signals show two peaks:
Consequently in this area of the Cold Front no Ana Front character can be noticed any longer. Temperature advection (left image top) still shows intensive CA already in front of the Cold Front but reveals also the possibility of a secondary upper level Cold Front, a fact which is also supported by the inclination of the isentropes there. This could indicate that the higher cloudiness of the Cold Front is bound to an upper level front while a distinct frontal surface, together with a pronounced surface front, develops with the cloud head to the north.
19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), magenta thin: divergence, magenta thick: convergence, orange thin:
IR pixel values, orange thick: WV pixel values
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19 February 1997/06.00 UTC - Vertical cross section; black: isentropes (ThetaE), lilac: Q-Vector (normal component), orange thin: IR pixel values,
orange thick: WV pixel values
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