NOAA Admitting something is wrong Geomagnetically, stating possible power grid fluctuations can occur;

Space Weather Message Code: ALTK04
Serial Number: 1560
Issue Time: 2012 Feb 19 0150 UTC

ALERT: Geomagnetic K-index of 4
Threshold Reached: 2012 Feb 19 0147 UTC
Synoptic Period: 0000-0300 UTC
Active Warning: Yes
Potential Impacts: Area of impact primarily poleward of 65 degrees
Geomagnetic Latitude.
Induced Currents - Weak power grid fluctuations can occur.
Aurora - Aurora may be visible at high latitudes such as Canada and
Alaska.

Link;
[link to www.swpc.noaa.gov]

Check out NICT Past few hours;

[link to www2.nict.go.jp]

Out of no where we get this geomagnetic anomaly, Sun has had no action recently to effect our magnetosphere. What could this possibly be? Coronal Hole? Gravitational wave from GRB(not the focused energy from GRB but the 360deg shock-wave)?