About this data:

The meteorologic information for the bridges is obtained from the Oregon Department of Transportation. It is updated every 15 minutes, but takes about another 15 to show up on the ODOT Website. Therefore, data lags by about 30 minutes here. Note that the Interstate Bridge data is of questionable reliability, as the weather station there is installed between the control houses of the lift span, and is likely subject to turbulence.

The airport data is obtained from NOAA METAR reports and is updated hourly.

A beta version of historical animations is available here. (Not yet completely compatible with Internet Explorer.)
A query form to select records from the database is available here.