More examples for the three classes

A case for class 1

7 February 2020, 06 UTC;
u.l.: 300-hpa height contours and VCS (vertical cross section) line; u.r.: TFP (thermal front parameter); l.l.: Contours of CVA (cyclonic vorticity advection) 300-hPa; l.r.: Contours of height at which PV = 2 units




7 February 2020, 06 UTC;
Fronts, trough lines, convection lines, High and Low centres; The blue line in the eastern Mediterranean indicates an upper-level trough line connected to the comma. The main polar front is located far to the west over the Atlantic



7 February 2020, 06 UTC:
horizontal cross-sections, class 1 l.: isentropes and PV > 1 unit; r: isentropes and vorticity advection: anticyclones in blue and cyclones in red



A case for class 2

22 February 2020, 15 UTC;
u.l.: 300-hpa height contours and VCS (vertical cross section) line; u.r.: TFP (thermal front parameter); l.l.: Contours of CVA (cyclonic vorticity advection) 300-hPa; l.r.: Contours of height at which PV = 2 units




22 February 2020, 15 UTC;
Fronts, trough lines, convection lines, H and L centers; The blue line south of the Peloponnese indicates a trough line connected to the comma. The main Polarfront is analysed over the Atlantic extending to West- and North Europe.



22 February 2020/ 15 UTC:
vertical cross sections, Class 2 u.l.: isentropes and PV > 1 unit; u. r: isentropes and vorticity advection: anticyclones in blue and cyclones in red l.l: omega: upward motion in red and downward motion in blue.



Two cases from class 3

15 August 2020, 12 UTC
u.l.: 300-hpa height contours and VCS (vertical cross section) line; u.r.: TFP (thermal front parameter); l.l.: Contours of CVA (cyclonic vorticity advection) 300-hPa; l.r.: Contours of height at which PV = 2 units




15 August 2020, 12 UTC;
l.: Airmass RGB r.: Fronts, trough lines, convection lines, H and L centers;



15 August 2020, 12 UTC: vertical cross sections, Class 3
u.l.: isentropes and PV > 1 unit; u. r: isentropes and vorticity advection: anticyclones in blue and cyclones in red l.l: omega: upward motion in red and downward motion in blue.



Second class 3 case

22 July 2020, 12 UTC
u.l.: 300-hpa height contours and VCS (vertical cross section) line; u.r.: TFP (thermal front parameter); l.l.: Contours of CVA (cyclonic vorticity advection) 300-hPa; l.r.: Contours of height at which PV = 2 units




22 July 2020, 12 UTC;
l.: Airmass RGB r.: Fronts, trough lines, convection lines, H and L centers;




22 July 2020, 12 UTC: vertical cross sections, Class 3
u.l.: isentropes and PV > 1 unit; u. r: isentropes and vorticity advection: anticyclones in blue and cyclones in red l.l: omega: upward motion in red and downward motion in blue.