https://www.theregister.co.uk/2018/09/04/azure_its_getting_hot_in_here/

Updated Microsoft has warned that a "subset of customers in South Central US" may experience Azure problems today after cooling issues sent the servers scurrying for the shutdown button.

The warning was first raised by Microsoft at 09:29 UTC as pretty much everything in the South Central US region went offline thanks to a temperature spike that caused servers to automatically shut down to avoid damage.