Understanding Weather – not predicting – 28 March 2013

What happened?
These days when weather analysis is to be found at the fingertip through a keyboard, the hard-earned expertise based on observation put together in the ‘dark ages’. comes into its own should the computer models go out of sync. Directly observing changing weather patterns can be very rewarding.
The reluctant skies of the past few months inched toward more purposeful patterns as the new week unfolded. Occasional clouds developed, pushing into the unrelenting dry air aloft.
Something had to give.
Observation showed crisp cumulus heads slowly becoming more numerous and resultant showers that bit more prolific but still short of the required intensity. As the week progressed, other factors, long absent from our skies, loomed.
A return to the fingertip activity confirmed the shift away from the dominant patterns of the past umpteen weeks. The high pressure column now lay eastward and its the controlling grip through the middle layers was fading as two major vortex cores appeared over the southern mid-Atlantic. These carried two extensive troughs northward and, at last, with considerable vertical extent.