Luck was on my side last night, though. :) I was in Tanaris just as the sands kicked up. Needless to say I freaked out and made a beeline towards the closest silithid area.
There were about a 7 of these little guys wandering around. I had to switch in a lower level team (to ensure I didn't kill the pet and to get some free experience :P), and I managed to battle at least 5 until I finally caught an uncommon hatchling. :D
It's no rare, but I'm content with an uncommon for now. I'll definitely still be on the look out for a rare version, though.
Here are the details of my sandstorm experience:
- Started at 10:30 PM (Kil'Jaeden server time), but due to CRZ the zone time was 12:30 AM.
- Ended at 1 AM (Kil'Jaeden server time), zone time was 3 AM.
- Total time was about two and a half hours.
- I only saw the Silithid Hatchlings spawn at the beginning of the sandstorm. Once those initial spawns were gone, I never saw anymore.