Hawaii News Daily:
"Early Friday morning (June 10, 2011), at about 3:00 A.M. local time, one of our new Monitoring Stations in Hawaii broadcast a Radiation Alert over the network, reaching a sustained level of over 100 CPM (Counts per Minute) for a period of about 15 minutes, peaking as high as 141 CPM at one point.
The readings then subsided to normal background levels of about 37 CPM for that station, but within less than 2 hours, trended quickly up again to over 100 CPM for another 5 minutes or so."
The CTBTO could corroborate Hawaii's findings with its own data, but i don't think they are updating anymore. Here's some of their most recent data compiled at bfs.de, which unfortunately, is over two weeks old: