Update [11:33pm CT]: Shironeko is reported to be safe with his family. Everyone is safe and well according to their sponsor [source]. Let's hope to hear from them on YouTube soon!
Unfortunately so far we have not been able to get any updates from Shironeko and his family. According to their old website, on June 14, 2008, one day after the 7.0 earthquake hit Japan, Shironeko's family updated their blog to let their fans know about their wellbeing. However this time, we have not seen an annoucement like such from their current blog except what it seems to be auto updates on the site.
There is a possibility that they are experiencing a power outage since a large number of households are without electricity, gas and water right now thus unable to access the internet or they have taken shelter. We are praying that they are safe and well.
Please stay positive and keep sending prayers to Shironeko and his family.