I understood the primary gag in the final panels, but I do not understand the meteorological setup in the first panel:

…
Perhaps it’s just the awkward expression: how can a hurricane “drop a millibar“? Did anything like this actually happen during either of the recent hurricanes?

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I might as well include the previous two B&C strips, which feature Horace’s “intentional CIDUs. The solution to the first one was explained in Week 94 of the Invitational, in which Gene Weingarten solicited even more obscure “Horace” material. (The results will appear in the Invitational on Halloween, and the better ones will probably be immortalized in future Barney & Clyde strips.)

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The second one I had to look up myself, but Barney’s tip in the last panel was a big help:

P.S. Given the solution, this one might also need a “geezer” tag.

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Here’s a third “Horace” strip from last year, which was also included (with its solution) in the Invitational article:

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