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The barometer was out today from roughly 11:30 until perhaps 19:00ish CDT. Note this is the 'plastic housing' spare barometer which I believe may be a ptb110 instead of a ptb220.
Steve reported:
the barometer at museum is reporting bad values:
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So the thought that's it is a temperature problem is a very good guess. We had a heat index around 95 this afternoon.
21Aug17 ~9CDT
A couple pieces of thin white cardboard were put over the barometer's housing in hopes to keep it cooler. During the day it appeared to stay up, so that may have helped.