Frontolysis is the weakening or
dissappearance of an existing front. It is the opposite of frontogenesis
and can be identified through comparing previous and current conditions.
Thickness Isopleth Gradient.
Frontolysis is indicated by thickness isopleths that
are more loosely spaced on the current 1000-500 mb thickness chart than
they were on previous charts.
Frontolysis is indicated by isotherms on the current
surface chart that are more loosely spaced than they were on the previous
surface chart. There is less temperature advection than on the previous
chart, thus the temperature contrast of the two air masses is not as strong
as it had once been.
Weakening of the isobar gradient could indicate frontolysis.
Isobars are now more loosely spaced than previous chart. There is a noticeable
decrease in cyclonic curvature as gradient weakens.
When a frontal inversion weakens or becomes less
pronounced, it indicates that the temperature contrast is also weakening.
Therefore, if the current Skew-T has a less pronounced inversion than the
previous Skew-T, frontolysis may be occurring.