At the rear side of the front a dark area connected to cold dry
sinking air is recognised. Over the dark stripe the maximum of PV value of 2 units can
be observed. The second darker area overlayed with PV value of 3 units is located far to the east.
25 May 2006, 18 UTC
The situation similar to one 6 hours before.
26 May 2006, 00 UTC
The situation similar to one 6 hours before.
26 May 2006, 06 UTC
Behind the frontal zone, over Romania and further to the north-west, the protruding stratospheric air can be
recognized in the WV 6,2 痠image and confirmed by the
modelled potential vorticity field. Behind the front, the model field fits well with
the WV dark stripe. It's also the case over eastern Turkey where the
PV value of 3 units is corresponds with the upper level low.
26 May 2006, 12 UTC
At this time step,the PV anomaly correlates well with a darker area over Romania
where PV value has reached 6 units.
In theory, the greater the number of PV units
is, the deeper dry, stratospheric air is expected to penetrate into the atmosphere.
26 May 2006, 18 UTC
The maximum of potential vorticity at 300 hPa isfound behind the frontal zone and fits well with the
dark stripe in the WV6.2 痠
satellite image.
27 May 2006, 00 UTC
There is still very good coincidence between the PVmaximum (PV value is 8 units) and the dark stripe behind the front.
27 May 2006, 06 UTC
There is still very good coincidence between the PVmaximum (PV value is 8 units) and the dark stripe behind the front.