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The chart shows an unusual pattern for the middle two weeks of October 2004. A solar eclipse on the 14th of October had created an unusually tight gap between the jet curves over the eastern Gulf of Alaska. Normally the eclipse points are separated by distances of 13° to 16° of arc. This puts a certain breathing space in the intervals of the jet curves as they stretch across the chart. During the transition time between the first eclipse in a set and the second eclipse in the set, the insertion of a new eclipse point in the chart skews this spacing between the eclipse points. This is rectified by the placement of the new eclipse point that re-establishes the correct spacing. In the chart the normal spacing for a 72° jet curve from the eastern eclipse point is labeled along the black jet curve. This was the original eclipse position of the 72° jet curve that was replaced by the new eclipse. The new point is depicted as the green 72° jet curve originating from the new eclipse point at 26° Pisces. This is colored green to distinguish it from the old jet curve and also to signify that it is under the influence of the lunar node at an angular aspect that supports high-pressure.
On the other side of the chart Jupiter, at 9° Virgo, was aspecting the old eclipse point placed at 19° Libra. It was also placed at a high-pressure aspect, so it is also rendered in green. It can be seen that the new 72° jet curve and the old 45° jet curve are in a very close pinched relationship over the eastern Gulf of Alaska. This pinch is rendered in yellow. Since both lines were aspected to high-pressure and they pinched into each other in a tight relationship in this ultra-sensitive area, we might expect some unusual event to arise. The combined high-pressure aspects of both of these jet curves was such that the high that arose along these lines was an intense one that reached up into the Gulf of Alaska. This intense, localized high controlled the motions of any fronts crossing that body of water. In the third week a moderate front from the Aleutians approached this area from the northwest. As it contacted the high-pressure it began to slide along the northeastern side of the block. As it slid I built up intensity due to the resistance. It then slid across the top of the block and like a child sliding down a playground slide it continued sliding south around the eastern side of the block and down into California.
The front intensified as it encountered the western side of the block, as is usual for these types of air masses. As a result, it was no longer a moderate storm but a winter-like trough with wind and rain when it slid down the other side of the block. This intensified storm perfectly tracked the 72° jet curve down the West Coast. The intense circulation around it brought record October rains to California at the end of the third week.