Propagation Forecast Bulletin #21 de K7RA:

At 2344 UTC on May 23, the Australian Space Forecast Centre issued a geomagnetic disturbance warning for May 26 and 27. On May 26 they predict a minor to major storm warning and on May 27 a minor storm. These are due to a "partial halo coronal mass ejection."

from Ham Radio Times http://ift.tt/2qlAVpr
via IFTTT