Discussion
Which sign does omega take when air is rising?
Answer: A
Pressure decreases with height, so a rising parcel experiences falling pressure and omega is negative. Model output charts therefore show ascent, and hence cloud and precipitation, as negative values. The convention follows entirely from the coordinate being inverted relative to height, and remembering it as a consequence rather than as an isolated fact makes it much harder to get wrong when reading a chart in a hurry. The shared properties explain why these belong to one family, and the differences explain why more than one exists.
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