This page contains time series plots of wet delay at North Liberty, IA and at Milwaukee WI, and of sounder-derived precipitable water at the same two locations. Although they are separated by 325 km, I wanted to see how well the variables track. As you can see below, peaks in one generally correspond to peaks in the other.

Time Series NLIB vs MIL1, stations separated by 325 km; Plots of wet delay obtained from Chuck Demets; Stations are well-correlated by show some scatter as might be expected given their distance apart

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Time Series NLIB vs MIL1, stations separated by 325 km; Plots of precipitable water derived from GOES Sounder data. Recall that the Sounder returns no data for cloudy regions, which explains the many breaks in the time series.

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