Slide 27 of 45
Notes:
In association with the mid level trough, the surface analysis shows a frontal boundary that extends from a low (not shown) over the Drake Passage, across the Falkland Islands-Nrn Patagonia-Cuyo Argentina. This front is supplying the low level convergence, and is acting as the focusing mechanism for moisture. Notice how strong the South Pacific High is behind this frontal boundary (with a 1039 hPa High).