Unfortunately, that is all you can do. SGT Hardcastle, who is In Charge of Inyo SAR, WILL NOT dispatch any of his posse until first light. The CHP Helo (Inyo SAR's SGT Hardcastle's first choice for Helo Air Support) from Victorville will not launch till first light either.
So pray for the best and follow up at 0600. I have first hand experiences with ICSAR and SGT Hardcastle. They will indeed do their best.