I’ve noticed the same thing and have a theory about why Azure span and occasionally waking shore seem to have way more storms than the other two zones. Thaldraszus and Ohn’ahran plains both only have 1 possible spawn location while waking shore has 2 and Azure Span has a whopping 3.
If the game is just picking a random spawn, the storm is 3 times more likely to spawn in azure span and 2 times more likely to spawn in waking shore than it is to spawn in Thaldraszus or Ohn’aran plains.
Source: I have not missed a storm spawn since the patch. Yes that means that I have not slept for more than 3 hours in a row in almost a week.
This achievement is incredibly problematic and before anyone comes in with the “you should have done it sooner” This achievement never had a reward tied to it and neither did the into the storm meta. There was 0 reason to do this achievement prior to patch 10.2.6. Blizzard only added a reward tied to this achievement after changing it to be this rng fiesta. In it’s current implementation, this achievement is completely unreasonable and I would argue statistically impossible for anyone that sleeps or does not work from home to complete.