Subjective Analysis: Issues
Information needed to draw contours: (a) data; (b) supporting meteorological information; and (c) inferences about continity in the data. . In this case, (b) is absent.
(c) is dependent upon the distances between stations. If the western most station is San Francisco and the eastern-most station New York, it clearly is nonsense to draw a continuous isobar between the two locations. However, assume that the locations have a sub-synoptic spacing. Then a reasonable solution is this.
But suppose there are two observations recording identical pressures different than 1008.0 mb, but the task is to draw the 1008 mb isobar?