The images present surface (1000 hPa) and upper level height (left image), as well as parameters characterizing the frontal situation such as thickness, TFP and TA (right image).

Apart from advection there are no dramatic changes in the height fields (left image) compared to the situation six hours before: surface low and upper level trough in the Mediterranean have moved eastward. Consequently a huge upper level trough extending from Romania across Greece to north Africa has developed.

The two frontal zones characterised by the TFP (right image) are very close together; the northern one is situated over north Greece, the southern one crosses Crete and has approached the Turkish south coast. During these movements the CA fields influence Greece, partly from the north connected with the Cold Front in Cold Advection, partly from the west behind the low system in the Mediterranean.

The wind fields for 12.00 UTC even enhance the situation described for 06.00 UTC: there is at low levels a distinct confluence zone in the Aegean Sea and over the Peloponnesus with easterly wind directions but a south-west stream at high levels. In these high levels a confluence zone can be determined, too, but it is close to north Turkey.