http://www.newsweek.com/solar-wind-coronal-hole-ch-hhs-geomagnetic-storm-1739253

Earth is expected to be hit by a moderate-strength geomagnetic storm on September 4 as solar wind escapes from a huge hole in the sun's atmosphere.

On Thursday, the U.S. National Oceanic and Atmospheric Administration's (NOAA) Space Weather Prediction Center (SWPC) warned that a G2-level geomagnetic storm was "likely" to occur this Sunday.