Update: 6/6/12, 11:55 P.M. - Very high reading in South Bend, IN station this evening. Reason unknown. Station unresponsive to contact at this late hour. Since this same station has triggered the Alert system before, which Alerts may have been false, and because his current readings do not appear to be corroborated by nearby stations, we have disabled his station for the time being. Will report back when we know more.

Update: 6/7/12, 7:45 A.M: - False Alert: The alert level reading last evening appears to be a false alert from an equipment malfunction. Here is the station's report:

"out of control readings on the GeigerGraph screen from about 11:30pm local time that occurred while sleeping. My apologies to all. I have no idea what caused this. Shut down GeigerGraph and restarted. Readings from the Geiger were in the normal range (the Geiger operates on A/C). All cable connections are tight and not loose. Am speculating between the GFI and USB Adapter and some sort of voltage spikes. The uninterruptable power supply UPS had lost power and had died - a tripped GFI. I am not going to leave the system running while not at home until I can determine and fix the problem."

By the way, a handful of stations on the Radiation Network feed simultaneously to the Black Cat Systems network, which explains why a high reading was showing on their network at the same time. But Black Cat works in uR/hr instead of CPM, so their radiation level was lower because of the conversion factor between units of measurement.