As was the case for qualifying on the afternoon prior, the 80-lap encounter has missed its scheduled start time, due to earlier lightning strikes in the area.
Qualifying ultimately got underway 90 minutes late, after which Team Penske's Scott McLaughlin earned a second pole position of his IndyCar career.
A green flag was supposed to have waved at 05:30 AEST, but proceedings remain on hold for the time being.
Update 06:34 AEST
Cars and crews now in pit lane.
Update 06:58 AEST
Track declared dry, despite significant dampness on circuit. Two-compound tyre rule still applies.
Update 07:06 AEST
Drivers given the command to start engines.
Update 07:13 AEST
Green flag waves, McLaughlin leads the field away.