At 0549 UTC on August 3 the Australian Space Forecast Centre issued this warning:
“During UT days 4-5 August expect an increase in geomagnetic activity up to active to minor storm levels due to influence of the recurrent coronal hole.
INCREASED GEOMAGNETIC ACTIVITY EXPECTED DUE TO CORONAL HOLE HIGH SPEED WIND STREAM FROM 04-05 AUGUST 2017.
GEOMAGNETIC ACTIVITY FORECAST
04 Aug: Active
05 Aug: Active”
Spaceweather.com issued this warning later on the same day: