Height Contours 1000 hPa:
- Upper Level Low over the Mediterranean:
There is no pronounced surface low recognisable; this is very typical for an Upper Level Low during the
major part of its life cycle.
- Upper Level Low over White Russia:
There is no pronounced surface low recognisable; this is very typical for an Upper Level Low during the
major part of its life cycle.
Height contours 500 hPa:
- Upper Level Low over the Mediterranean
There is a very pronounced low center at 500 hPa. This is a necessary condition for an Upper Level Low and a
very classical situation in this case.
- Upper Level Low over White Russia:
This Upper Level Low is accompanied by a low center at high levels but there is no obvious closed circulation.
This happens quite often in the case of smaller scale Upper Level Lows like the one shown here.
Height of PV=2 units:
- Upper Level Low over the Mediterranean:
The isolines show that dry stratospheric air has protruded downward to about 450 hPa. This PV anomaly is very
typical for an Upper Level Low.
- Upper Level Low over White Russia:
The isolines show that dry stratospheric air has protruded downward to about 450 hPa. This PV anomaly is very
typical for an Upper Level Low.
TFP:
- Upper Level Low over the Mediterranean:
There is no pronoucned TFP connected to the boundaries of this Upper Level Low but especially the very well
developed eastern cloud band shows some indication of a TFP. This is quite usual.
- Upper Level Low over White Russia:
There is no TFP at the boundaries of this small scale Upper Level Low. This is typical for the small scale
Upper Level Low. This indicates also the differences between the two Upper Level Low cases.
Equivalent Thickness:
- Upper Level Low over the Mediterranean:
The equivalent thickness clearly shows a minimum representing the cold air invovled in the Upper Level Low; no
zone of high gradients at the boundaries can be seen . This is very typical for the conceptual Model of an
Upper Level Low.
- Upper Level Low over White Russia:
The trough in the isolines of equivalent thickness indicates the cold air involved in this smaller scale Upper
Level Low. This is a very typical configuration.