In addition to the csat.1m.uw sonic being buried:

• TRH.6m.c seems to have died this morning (no response to rs and pio doesn't help)
• ec150.1m.ue also died this morning (the raw signals are about 0.0, rather than 0.9, indicating a signal blockage)

Note that there was a bunch of new snow overnight, so I would hope that the ec150 will come back.  I'm less sure about the TRH.