![Heavy storm clouds moved over Brisbane on Saturday.](/web/20161205172952im_/http://www.smh.com.au/content/dam/images/g/t/3/e/a/m/image.related.wideLandscape.460x259.gt43we.png/1480909719482.jpg)
What caused heavy delays in Weatherzone, council storm alert app?
A technical issue that failed to notify thousands of Brisbane residents prior to Saturday's destructive storm is expected to be identified by the end of the day, Weatherzone's Head of Development says.