Somewhat of a forecast bust

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Today, both I and the NWS was expecting a dry day over Puget Sound, with perhaps a sprinkle overnight when no one would notice...then improving conditions tomorrow.  The basis of these forecasts were the output from computer forecast models--such as the ones shown below (three hour rainfall ending 1 pm and 4pm, probabilistic forecasts from the UW ensemble system--red indicates 90% probability of rain):

The approaching front was somewhat stronger than forecast and moved in more quickly, so that there were some light showers during the midafternoon (see radar images at 1 and 2:42 PM).  Not the forecast bust of the century, but it shows how things can go wrong, even for a short-term forecast.
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