Alert for when volume disappears

I am the SolarWinds administrator at our site.  Sometimes the SAN engineers will change a volume mapping on a server and I don't know about it.  I have to manually go back through the entire day's events and look for something like this:

evcluster01.nes.local-Q:\ Quorum 3c3b77ae- Volume no longer exists. Data collection suspended. 

I would like to set up an alert that emails me every time a volume disappears, but I'm having trouble figuring out what the alert condition should be.  Is it the Volume Index that changes?  What conditions should be met in order for this alert to trigger? 

TIA