For some time I have noticed that almost daily my info as well as others from my local area just doesn't show up on the wunderground page....snip
I have had the same problem and contacted WeatherUnderground. Here's the response I got back from them:
"Your station has temporarily been removed because your temperature readings are significantly different than the surrounding stations. It will return to our forecast pages with 24 hours of your data getting back within the normal range. If you feel this is an error, please give us more details."
The problem, however, is that my weather station's data is collected at 3440 feet elevation, while the data from nearby stations are collected at about 2,600 feet. The differences in temperature are due to elevation differences. My station can easily be 15 degrees different in temperature from those in the valleys nearby.
Apparently, the data quality control algorithm does not take into account elevation differences between nearby stations. Instead, it assumes that all nearby stations are at the same or very similar elevations. This may be a good assumption in Iowa, but certainly not in the mountainous regions. WeatherUnderground's data quality algorithm must be somewhat new since I've never had the disappearing current conditions problems until the last few weeks. My current conditions data only shows up now when my station's temperature is close to the temperature being reported by nearby stations at lower elevations.