Dubai infrequently has storms bad enough that your visibility is impaired, but if it is visibly stormy, then yes we'd reconsider visiting that day.   You may also experience fog, particularly in Dubai's winter months.  Whilst the Burj Khalifa can still offer some spectacular views sitting, in fact, above the cloud levels, fog at the Dubai Frame will block out your view and is not recommended. You can learn more about unusual weather patterns for Dubai here.