Charles Davis Nov 30, 2014:

@Peter "Isobar patterns" are indeed mentioned in meteorological texts, quite commonly in fact, and of course they exist: isobars do form patterns. I've quoted a couple of examples in my answer; here's another:
"Figure 2 shows the classic “U” shaped isobar pattern over the Mid-Atlantic and a 1030+ mb parent high over New England and southern Canada."
http://www.erh.noaa.gov/mhx/EventReviews/20041226/20041226.p...

The pattern is simply the configuration or arrangement of a series of isobars relative to each other, and it is very informative, much more so than the shape of a single isobar. If, for example, the isobars are closely spaced (that is, the pressure gradient is steep) and tightly curved, conclusions can be drawn. Obviously this means at a given moment; air is moving all the time so isobars are changing position all the time.

As I said, "marco isobárico" is an expression that doesn't seem to occur on the Internet. We have to guess what they might mean by it. Given how the word "marco" (frame, framework, context, contextual situation) is used in Spanish, I think they're probably referring to the pattern or configuration of a series of isobars rather than to a single isobar.

Peter Simon Nov 30, 2014:

@Whoever asked me what I meant in my remark to Ch. To save my face,I have to answer your Q. 1st, I don't speak Spanish,but I understood the point in Q when it came up in the E to E section and I meant to help.2nd, Charles himself pointed out that he hasn't found any mention of the phrase asked. No wonder, I haven't ever heard of such a think in my meteorological studies either.My answer referred to what comes up in meteorological texts.No 'isobar patterns'.Iso means 'the same', isobar means points of the same pressure, bar being the measure for pressure.Thus the only pattern isobars can have is the curve, i.e. curving lines.Whatever the Sp. text has, isobars can make no other pattern. Isobaric curves may be seen as parts of meteorological systems,so we can speak about a pattern of isobaric lines.Curves are the technical name for the line pattern of the lines isobars can be shown on a map.That's a kind of pattern, but patterns are usually systems of features based on some mathematical, geometrical, or artistic order, not found in connection with isobars,which are highly disorganized and changeable with time. Whole meteorological systems,like cyclones have certain regularities, but they aren't organized and aren't called patterns.